1. 環(huán)境信息
1.1. 系統及版本
[root@k8s-master01 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux release 9.1 (Plow)
[root@k8s-master01 ~]#
1.2. 配置信息
| 序號 | 名稱 | IP地址 | CPU/顆 | 內存/GB | 硬盤/GB | 描述 |
|---|---|---|---|---|---|---|
| 1 | k8s-master01 | 192.168.1.11 | 4 | 4 | 100 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived、nginx |
| 2 | k8s-master02 | 192.168.1.12 | 4 | 4 | 100 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived、nginx |
| 3 | k8s-master03 | 192.168.1.13 | 4 | 4 | 100 | kube-apiserver、kube-controller-manager、kube-scheduler、etcd、 kubelet、kube-proxy、nfs-client、haproxy、keepalived、nginx |
| 4 | k8s-node01 | 192.168.1.21 | 4 | 4 | 100 | kubelet、kube-proxy、nfs-client、nginx |
| 5 | k8s-node02 | 192.168.1.22 | 4 | 4 | 100 | kubelet、kube-proxy、nfs-client、nginx |
| 6 | k8s-node03 | 192.168.1.23 | 4 | 4 | 100 | kubelet、kube-proxy、nfs-client、nginx |
| 7 | VIP | 192.168.1.51 | 浮動IP地址 |
1.3. 軟件版本
| 序號 | 軟件 | 版本 | 描述 |
|---|---|---|---|
| 1 | kernel | 5.14.0-307.el9.x86_64 | |
| 2 | RedHat | 9.1 | |
| 3 | kube-apiserver、kube-controller-manager、 kube-scheduler、kubelet、kube-proxy |
1.27.1 | |
| 4 | etcd | 3.5.9 | |
| 5 | containerd | v1.7.1 | |
| 6 | cfssl | 1.6.4 | |
| 7 | cfssljson | 1.6.4 | |
| 8 | cni | 1.3.0 | |
| 9 | crictl | 1.27.0 | |
| 10 | haproxy | haproxy-2.4.17-6.el9.x86_64 | |
| 11 | keepalived | keepalived-2.2.4-6.el9.x86_64 |
1.4. 網絡信息
| 序號 | 用途 | 網段 | 網關 | 描述 |
|---|---|---|---|---|
| 1 | 物理主機 | 192.168.1.0/24 | 192.168.1.1 | |
| 2 | service | 192.168.200.0/22 | 192.168.200.1 | 自定義 |
| 3 | POD | 192.168.204.0/22 | 192.168.204.1 | 自定義 |
2. 系統配置
2.1. 配置IP地址
[root@master ~]# nmcli connection modify ens16 ipv4.addresses 192.168.1.11/24
[root@master ~]# nmcli connection modify ens16 ipv4.gateway 192.168.1.1
[root@master ~]# nmcli connection modify ens16 ipv4.method manual
[root@master ~]# nmcli connection modify ens16 ipv4.dns 114.114.114.114
[root@master ~]# nmcli connection up ens16
2.2. 主機名配置
[root@master ~]# hostnamectl set-hostname k8s-master01
[root@master ~]# hostnamectl set-hostname k8s-master02
[root@master ~]# hostnamectl set-hostname k8s-master03
[root@master ~]# hostnamectl set-hostname k8s-node01
[root@master ~]# hostnamectl set-hostname k8s-node02
[root@master ~]# hostnamectl set-hostname k8s-node03
2.3. YUM源配置
[root@k8s-master01 yum.repos.d]# cd /etc/yum.repos.d/
[root@k8s-master01 yum.repos.d]# rm -rf *
[root@k8s-master01 yum.repos.d]# cat > aliyun.repo << EOF
[aliyun-app]
name=aliyun-appsteam
baseurl=https://mirrors.aliyun.com/centos-stream/9-stream/AppStream/x86_64/os/
gpgcheck=0
[aliyun-base]
name=aliyun-baseos
baseurl=https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/
gpgcheck=0
EOF
[root@k8s-master01 yum.repos.d]#
[root@k8s-master01 yum.repos.d]# yum install -y wget psmisc vim net-tools nfs-utils telnet yum-utils device-mapper-persistent-data lvm2 git tar curlgcc bash-completion chrony sshpass ipvsadm ipset sysstat conntrack libseccomp lm_sensors-libs ipset-libs
[root@k8s-master01 yum.repos.d]# yum clean all
[root@k8s-master01 yum.repos.d]# yum makecache
2.4. 軟件下載
可通過以下連接下載當前最新版的軟件版本。
https://github.com/containernetworking/plugins/releases/
https://github.com/containerd/containerd/releases/
https://github.com/kubernetes-sigs/cri-tools/releases/
https://github.com/Mirantis/cri-dockerd/releases/
https://github.com/etcd-io/etcd/releases/
https://github.com/cloudflare/cfssl/releases/
https://github.com/kubernetes/kubernetes/tree/master/CHANGELOG
https://download.docker.com/linux/static/stable/x86_64/
https://github.com/opencontainers/runc/releases/
https://mirrors.tuna.tsinghua.edu.cn/elrepo/kernel/el7/x86_64/RPMS/
2.5. 系統配置
2.5.1. 關閉防火墻
[root@k8s-master01 ~]# systemctl disable --now firewalld
[root@k8s-master01 ~]#
2.5.2. 關閉SELinux
[root@k8s-master01 ~]# setenforce 0
[root@k8s-master01 ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
2.5.3. 關閉SWAP交換分區(qū)
[root@k8s-master01 ~]# sed -ri 's/.*swap.*/#&/' /etc/fstab
[root@k8s-master01 ~]# swapoff -a && sysctl -w vm.swappiness=0
[root@k8s-master01 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri May 5 07:27:34 2023
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/rhel-root00 / ext4 defaults 1 1
UUID=43b614b8-111c-428e-995b-925cec978b0f /boot ext4 defaults 1 2
/dev/mapper/rhel-root /home ext4 defaults 1 2
/dev/mapper/rhel-var /var ext4 defaults 1 2
/dev/mapper/rhel-var_log /var/log ext4 defaults 1 2
#/dev/mapper/rhel-swap none swap defaults 0 0
[root@k8s-master01 ~]#
2.5.4. 網絡配置
[root@k8s-master01 ~]# cat > /etc/NetworkManager/conf.d/calico.conf << EOF
[keyfile]
unmanaged-devices=interface-name:cali*;interface-name:tunl*
EOF
[root@k8s-master01 ~]# systemctl restart NetworkManager
2.5.5. 時鐘同步
[root@k8s-master01 ~]# yum install chrony -y
[root@k8s-master01 ~]# cat > /etc/chrony.conf << EOF
pool 時鐘服務器地址 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow 192.168.1.0/24
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
EOF
[root@k8s-master01 ~]# systemctl restart chronyd ; systemctl enable chronyd
[root@k8s-master01 ~]# chronyc sources -v
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current best, '+' = combined, '-' = not combined,
| / 'x' = may be in error, '~' = too variable, '?' = unusable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.10.10 3 10 377 1004 -615us[ -725us] +/- 161ms
[root@k8s-master01 ~]#
2.5.6. 配置ulimit
[root@k8s-master01 ~]# ulimit -SHn 65535
[root@k8s-master01 ~]# cat >> /etc/security/limits.conf <<EOF
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
[root@k8s-master01 ~]# EOF
2.5.7. 配置免密登錄（互信）
[root@k8s-master01 ~]# yum install -y sshpass
[root@k8s-master01 ~]# ssh-keygen -f /root/.ssh/id_rsa -P ''
[root@k8s-master01 ~]# export IP="192.168.1.11 192.168.1.12 192.168.1.13 192.168.2.21 192.168.2.22 192.168.2.23"
[root@k8s-master01 ~]# export SSHPASS=123123
[root@k8s-master01 ~]# for HOST in $IP;do sshpass -e ssh-copy-id -o StrictHostKeyChecking=no $HOST;done
2.5.8. kernel升級
[root@k8s-master01 ~]# yum install https://www.elrepo.org/elrepo-release-9.el9.elrepo.noarch.rpm
[root@k8s-master01 ~]# sed -i "s@mirrorlist@#mirrorlist@g" /etc/yum.repos.d/elrepo.repo
[root@k8s-master01 ~]# sed -i "s@elrepo.org/linux@mirrors.tuna.tsinghua.edu.cn/elrepo@g" /etc/yum.repos.d/elrepo.repo
[root@k8s-master01 ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
[root@k8s-master01 ~]# 這里選擇的是穩(wěn)定版kernel-ml 如需更新長期維護版本kernel-lt
[root@k8s-master01 ~]# yum -y --enablerepo=elrepo-kernel install kernel-ml
[root@k8s-master01 ~]# rpm -qa | grep kernel
[root@k8s-master01 ~]# 查看默認內核
[root@k8s-master01 ~]# grubby --default-kernel
[root@k8s-master01 ~]# 若不是最新的使用命令設置
[root@k8s-master01 ~]# grubby --set-default $(ls /boot/vmlinuz-* | grep elrepo)
[root@k8s-master01 ~]# 重啟生效
[root@k8s-master01 ~]# reboot
2.5.9. 模塊加載
[root@k8s-master01 ~]# cat >> /etc/modules-load.d/ipvs.conf <<EOF
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
[root@k8s-master01 ~]# systemctl restart systemd-modules-load.service
[root@k8s-master01 ~]# lsmod | grep -e ip_vs -e nf_conntrack
nf_conntrack_netlink 57344 0
nfnetlink 20480 5 nft_compat,nf_conntrack_netlink,nf_tables,ip_set
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 47
ip_vs 204800 53 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 188416 7 xt_conntrack,nf_nat,xt_nat,nf_conntrack_netlink,xt_CT,xt_MASQUERADE,ip_vs
nf_defrag_ipv6 24576 4 nf_conntrack,xt_socket,xt_TPROXY,ip_vs
nf_defrag_ipv4 16384 3 nf_conntrack,xt_socket,xt_TPROXY
libcrc32c 16384 4 nf_conntrack,nf_nat,nf_tables,ip_vs
[root@k8s-master01 ~]#
2.5.10. 修改內核參數
[root@k8s-master01 ~]# cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.all.forwarding = 1
EOF
[root@k8s-master01 ~]# sysctl --system
2.5.11. 配置hosts本地解析
[root@k8s-master01 ~]# cat >> /etc/hosts << EOF
192.168.1.11 k8s-master01
192.168.1.12 k8s-master02
192.168.1.13 k8s-master03
192.168.1.21 k8s-node01
192.168.1.22 k8s-node02
192.168.1.23 k8s-node03
192.168.1.51 lb-vip
EOF
[root@k8s-master01 ~]#
3. 基本組件安裝
3.1. 安裝containerd作為Runtime(master、node節(jié)點都操作)
3.1.1. 將軟件包發(fā)送到各個節(jié)點
[root@k8s-master01 ~]# grep k8s /etc/hosts | awk '{print $2}' | xargs -i scp cni-plugins-linux-amd64-v1.3.0.tgz root@{}:/root/
[root@k8s-master01 ~]# grep k8s /etc/hosts | awk '{print $2}' | xargs -i scp crictl-v1.27.0-linux-amd64.tar.gz root@{}:/root/
[root@k8s-master01 ~]# grep k8s /etc/hosts | awk '{print $2}' | xargs -i scp kubernetes-server-linux-amd64.tar.gz root@{}:/root/
[root@k8s-master01 ~]# grep k8s /etc/hosts | awk '{print $2}' | xargs -i scp cri-containerd-cni-1.7.1-linux-amd64.tar.gz root@{}:/root/
[root@k8s-master01 ~]#
3.1.2. 開始安裝
[root@k8s-master01 ~]# mkdir -pv /etc/cni/net.d /opt/cni/bin
[root@k8s-master01 ~]# tar -zxvf /root/cri-containerd-cni-1.7.1-linux-amd64.tar.gz -C /
[root@k8s-master01 ~]# tar -zxvf /root/cni-plugins-linux-amd64-v1.3.0.tgz -C /opt/cni/bin/
3.1.3. 創(chuàng)建服務啟動文件
[root@k8s-master01 ~]# cat > /etc/systemd/system/containerd.service <<EOF
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
TasksMax=infinity
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
EOF
[root@k8s-master01 ~]#
3.1.4. containerd所需模塊加載
[root@k8s-master01 ~]# cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
[root@k8s-master01 ~]# systemctl restart systemd-modules-load.service
[root@k8s-master01 ~]# systemctl status systemd-modules-load.service
● systemd-modules-load.service - Load Kernel Modules
Loaded: loaded (/usr/lib/systemd/system/systemd-modules-load.service; static)
Active: active (exited) since Thu 2023-06-01 10:31:08 CST; 24h ago
Docs: man:systemd-modules-load.service(8)
man:modules-load.d(5)
Process: 612 ExecStart=/usr/lib/systemd/systemd-modules-load (code=exited, status=0/SUCCESS)
Main PID: 612 (code=exited, status=0/SUCCESS)
CPU: 316ms
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ip_vs_rr'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ip_vs_wrr'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ip_vs_sh'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ip_tables'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ip_set'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'xt_set'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ipt_rpfilter'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ipt_REJECT'
Jun 01 10:31:08 k8s-master01 systemd-modules-load[612]: Inserted module 'ipip'
Jun 01 10:31:08 k8s-master01 systemd[1]: Finished Load Kernel Modules.
[root@k8s-master01 ~]# cat /usr/lib/systemd/system/systemd-modules-load.service
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Load Kernel Modules
Documentation=man:systemd-modules-load.service(8) man:modules-load.d(5)
DefaultDependencies=no
Conflicts=shutdown.target
Before=sysinit.target shutdown.target
ConditionCapability=CAP_SYS_MODULE
ConditionDirectoryNotEmpty=|/lib/modules-load.d
ConditionDirectoryNotEmpty=|/usr/lib/modules-load.d
ConditionDirectoryNotEmpty=|/usr/local/lib/modules-load.d
ConditionDirectoryNotEmpty=|/etc/modules-load.d
ConditionDirectoryNotEmpty=|/run/modules-load.d
ConditionKernelCommandLine=|modules-load
ConditionKernelCommandLine=|rd.modules-load
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/lib/systemd/systemd-modules-load
TimeoutSec=90s
[root@k8s-master01 ~]#
3.1.5. 配置containerd所需內核參數
[root@k8s-master01 ~]# cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
# 加載內核
[root@k8s-master01 ~]# sysctl --system
3.1.6. 創(chuàng)建配置文件
配置文件中修改sandbox_image的源地址需要注意，因為有些地址無法下載，需要通過下面的方法進行修改。
請使用docker search pause進行查找，找到國內可下載的源地址。
查找容器倉庫，我找選擇了dyrnq的倉庫。請根據查詢到的結果進行選擇。
[root@master ~]# docker search pause
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
rancher/pause 6
rancher/pause-amd64 4
google/pause 6
kubernetes/pause restore from backup of kubernetes/pause 13
docker/desktop-kubernetes-pause Mirror of selected tags from k8s.gcr.io/pause 1
almalinux/pause 0
ibmcom/pause Docker Image for IBM Cloud private-CE (Commu… 4
kubeedge/pause pause container image. 1
pauseyyf/pause 0
igneoussystems/pause copy of kubernetes/pause 0
ibmcom/pause-ppc64le Docker Image for IBM Cloud Private-CE (Commu… 1
pauseyop/pause 0
mirrorgooglecontainers/pause-amd64 22
easzlab/pause-amd64 from gcr.io/google_containers/pause-amd64 1
lc13579443/pause-amd64 pause-amd64 1 [OK]
catalystcloud/pause 0
kubesphere/pause 2
wyliog/pause-amd64 0
dyrnq/pause registry.k8s.io/pause 1
dlws/pause-amd64 0
e2eteam/pause 0
mirrorgooglecontainers/pause 3
banzaicloud/pause 0
sapcc/pause-amd64 0
linode/pause 0
[root@master ~]#
配置文件
[root@k8s-master01 ~]# mkdir -pv /etc/containerd
mkdir: created directory '/etc/containerd'
[root@k8s-master01 ~]# containerd config default | tee /etc/containerd/config.toml
[root@k8s-master01 ~]# sed -i "s#SystemdCgroup\ \=\ false#SystemdCgroup\ \=\ true#g" /etc/containerd/config.toml
[root@k8s-master01 ~]# cat /etc/containerd/config.toml | grep SystemdCgroup
SystemdCgroup = true
[root@k8s-master01 ~]# sed -i "s#registry.k8s.io#dyrnq#g" /etc/containerd/config.toml
[root@k8s-master01 ~]# cat /etc/containerd/config.toml | grep sandbox_image
sandbox_image = "dyrnq/pause:3.8"
[root@k8s-master01 ~]# sed -i "s#config_path\ \=\ \"\"#config_path\ \=\ \"/etc/containerd/certs.d\"#g" /etc/containerd/config.toml
[root@k8s-master01 ~]# cat /etc/containerd/config.toml | grep certs.d
config_path = "/etc/containerd/certs.d"
config_path = "/etc/containerd/certs.d"
[root@k8s-master01 ~]# mkdir /etc/containerd/certs.d/docker.io -pv
mkdir: created directory '/etc/containerd/certs.d'
mkdir: created directory '/etc/containerd/certs.d/docker.io'
[root@k8s-master01 ~]# cat > /etc/containerd/certs.d/docker.io/hosts.toml << EOF
server = "https://docker.io"
[host."https://hub-mirror.c.163.com",host."https://l8bqm6qk.mirror.aliyuncs.com"]
capabilities = ["pull", "resolve"]
EOF
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now containerd
Created symlink /etc/systemd/system/multi-user.target.wants/containerd.service → /etc/systemd/system/containerd.service.
[root@k8s-master01 ~]# systemctl restart containerd
[root@k8s-master01 ~]# systemctl status containerd
3.1.7. 配置crictl客戶端連接的運行時設置
[root@k8s-master01 ~]# tar xf /root/crictl-v*-linux-amd64.tar.gz -C /usr/bin/
[root@k8s-master01 ~]# cat > /etc/crictl.yaml <<EOF
> runtime-endpoint: unix:///run/containerd/containerd.sock
> image-endpoint: unix:///run/containerd/containerd.sock
> timeout: 10
> debug: false
> EOF
[root@k8s-master01 ~]#
[root@k8s-master01 ~]# systemctl restart containerd
[root@k8s-master01 ~]# crictl info
3.2. k8s與etcd安裝
3.3. 解壓與安裝{僅在master01上操作}
[root@k8s-master01 cby]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
[root@k8s-master01 cby]#
[root@k8s-master01 cby]# tar -zxvf etcd-v3.5.9-linux-amd64.tar.gz
[root@k8s-master01 cby]# mv etcd-v3.5.9-linux-amd64/etcd /usr/local/bin/
[root@k8s-master01 cby]# mv etcd-v3.5.9-linux-amd64/etcdctl /usr/local/bin/
[root@k8s-master01 cby]# ls /usr/local/bin/
containerd containerd-shim-runc-v1 containerd-stress critest ctr etcdctl kube-controller-manager kubelet kube-scheduler
containerd-shim containerd-shim-runc-v2 crictl ctd-decoder etcd kube-apiserver kubectl kube-proxy
[root@k8s-master01 cby]# kubelet --version
Kubernetes v1.27.1
[root@k8s-master01 cby]# etcdctl version
etcdctl version: 3.5.9
API version: 3.5
[root@k8s-master01 cby]#
3.3.1. 發(fā)送到其他節(jié)點
[root@k8s-master01 cby]# Master='k8s-master02 k8s-master03'
[root@k8s-master01 cby]# Work='k8s-node01 k8s-node02'
[root@k8s-master01 cby]#
[root@k8s-master01 cby]# for NODE in $Master; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
[root@k8s-master01 cby]# for NODE in $Work; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done
3.3.2. 創(chuàng)建證書相關文件
3.3.2.1. pki
mkdir: created directory 'pki'
[root@k8s-master01 kubernetes]# cd pki
[root@k8s-master01 pki]# cat > admin-csr.json << EOF
{
"CN": "admin",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]# cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
EOF
[root@k8s-master01 pki]# cat > etcd-ca-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
[root@k8s-master01 pki]# cat > front-proxy-ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"ca": {
"expiry": "876000h"
}
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > kubelet-csr.json << EOF
{
"CN": "system:node:\$NODE",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "system:nodes",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]# cat > manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > apiserver-csr.json << EOF
{
"CN": "kube-apiserver",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > etcd-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
]
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > front-proxy-client-csr.json << EOF
{
"CN": "front-proxy-client",
"key": {
"algo": "rsa",
"size": 2048
}
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > kube-proxy-csr.json << EOF
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-proxy",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cat > scheduler-csr.json << EOF
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "Kubernetes-manual"
}
]
}
EOF
[root@k8s-master01 pki]#
3.3.2.2. bootstrap
[root@k8s-master01 kubernetes]# mkdir -pv bootstrap
mkdir: created directory 'bootstrap'
[root@k8s-master01 kubernetes]# cd bootstrap
[root@k8s-master01 bootstrap]# head -c 6 /dev/urandom | od -An -t x | tr -d ' '
c9ebc12f00009c35
[root@k8s-master01 bootstrap]# cat > bootstrap.secret.yaml << EOF
apiVersion: v1
kind: Secret
metadata:
name: bootstrap-token-c8ad9c
namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
description: "The default bootstrap token generated by 'kubelet '."
token-id: c8ad9c
token-secret: c9ebc12f00009c35
usage-bootstrap-authentication: "true"
usage-bootstrap-signing: "true"
auth-extra-groups: system:bootstrappers:default-node-token,system:bootstrappers:worker,system:bootstrappers:ingress
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubelet-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:node-bootstrapper
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-certificate-rotation
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:nodes
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kube-apiserver
EOF
[root@k8s-master01 bootstrap]#
3.3.2.3. coredns
[root@k8s-master01 kubernetes]# mkdir -pv coredns
mkdir: created directory 'coredns'
[root@k8s-master01 kubernetes]# cd coredns
[root@k8s-master01 coredns]#
[root@k8s-master01 coredns]# cat > coredns.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: calico/coredns:v1.10.0
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 192.168.200.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
EOF
3.3.2.4. metrics-server
[root@k8s-master01 kubernetes]# mkdir -pv metrics-server
mkdir: created directory 'metrics-server'
[root@k8s-master01 kubernetes]# cd metrics-server
[root@k8s-master01 metrics-server]# cat > metrics-server.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
k8s-app: metrics-server
rbac.authorization.k8s.io/aggregate-to-admin: "true"
rbac.authorization.k8s.io/aggregate-to-edit: "true"
rbac.authorization.k8s.io/aggregate-to-view: "true"
name: system:aggregated-metrics-reader
rules:
- apiGroups:
- metrics.k8s.io
resources:
- pods
- nodes
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
k8s-app: metrics-server
name: system:metrics-server
rules:
- apiGroups:
- ""
resources:
- pods
- nodes
- nodes/stats
- namespaces
- configmaps
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
k8s-app: metrics-server
name: metrics-server-auth-reader
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
k8s-app: metrics-server
name: metrics-server:system:auth-delegator
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:auth-delegator
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
k8s-app: metrics-server
name: system:metrics-server
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:metrics-server
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
spec:
ports:
- name: https
port: 443
protocol: TCP
targetPort: https
selector:
k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
spec:
selector:
matchLabels:
k8s-app: metrics-server
strategy:
rollingUpdate:
maxUnavailable: 0
template:
metadata:
labels:
k8s-app: metrics-server
spec:
containers:
- args:
- --cert-dir=/tmp
- --secure-port=4443
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --kubelet-use-node-status-port
- --metric-resolution=15s
- --kubelet-insecure-tls
- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem # change to front-proxy-ca.crt for kubeadm
- --requestheader-username-headers=X-Remote-User
- --requestheader-group-headers=X-Remote-Group
- --requestheader-extra-headers-prefix=X-Remote-Extra-
image: calico/metrics-server:v0.6.3
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /livez
port: https
scheme: HTTPS
periodSeconds: 10
name: metrics-server
ports:
- containerPort: 4443
name: https
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /readyz
port: https
scheme: HTTPS
initialDelaySeconds: 20
periodSeconds: 10
resources:
requests:
cpu: 100m
memory: 200Mi
securityContext:
readOnlyRootFilesystem: true
runAsNonRoot: true
runAsUser: 1000
volumeMounts:
- mountPath: /tmp
name: tmp-dir
- name: ca-ssl
mountPath: /etc/kubernetes/pki
nodeSelector:
kubernetes.io/os: linux
priorityClassName: system-cluster-critical
serviceAccountName: metrics-server
volumes:
- emptyDir: {}
name: tmp-dir
- name: ca-ssl
hostPath:
path: /etc/kubernetes/pki
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
labels:
k8s-app: metrics-server
name: v1beta1.metrics.k8s.io
spec:
group: metrics.k8s.io
groupPriorityMinimum: 100
insecureSkipTLSVerify: true
service:
name: metrics-server
namespace: kube-system
version: v1beta1
versionPriority: 100
EOF
4. 證書生成工具
在master01上進行操作
[root@k8s-master01 cby]# cp cfssl_1.6.4_linux_amd64 /usr/local/bin/cfssl
[root@k8s-master01 cby]# cp cfssljson_1.6.4_linux_amd64 /usr/local/bin/cfssljson
[root@k8s-master01 cby]# cp cfssl-certinfo_1.6.4_linux_amd64 /usr/local/bin/cfssl-certinfo
[root@k8s-master01 cby]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
[root@k8s-master01 cby]# cfssl version
Version: 1.6.4
Runtime: go1.18
[root@k8s-master01 metrics-server]# cfssljson -version
Version: 1.6.4
Runtime: go1.18
4.1. 生成etcd證書
4.1.1. 在所有master節(jié)點上操作
在master01上生成etcd證書
- 生成etcd證書和etcd證書的key（如果你覺得以后可能會擴容，可以在ip那多寫幾個預留出來）
[root@k8s-master01 cby]# mkdir /etc/etcd/ssl -pv
mkdir: created directory '/etc/etcd'
mkdir: created directory '/etc/etcd/ssl'
[root@k8s-master01 cby]#
[root@k8s-master01 cby]# cd ..
[root@k8s-master01 kubernetes]# ls
bootstrap cby coredns csi-hostpath ingress-yaml metrics-server snapshotter
calico cilium coredns-yaml dashboard kubeadm-metrics-server pki
[root@k8s-master01 kubernetes]# cd pki/
[root@k8s-master01 pki]# ls
admin-csr.json ca-config.json etcd-ca-csr.json front-proxy-ca-csr.json kubelet-csr.json manager-csr.json
apiserver-csr.json ca-csr.json etcd-csr.json front-proxy-client-csr.json kube-proxy-csr.json scheduler-csr.json
[root@k8s-master01 pki]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
2023/05/30 16:06:27 [INFO] generating a new CA key and certificate from CSR
2023/05/30 16:06:27 [INFO] generate received request
2023/05/30 16:06:27 [INFO] received CSR
2023/05/30 16:06:27 [INFO] generating key: rsa-2048
2023/05/30 16:06:27 [INFO] encoded CSR
2023/05/30 16:06:27 [INFO] signed certificate with serial number 70528097076440131624359059234566212793915173444
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/etcd/ssl/etcd-ca.pem \
> -ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
> -config=ca-config.json \
> -hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,192.168.1.11,192.168.1.12,192.168.1.13,192.168.1.14,192.168.1.15 \
> -profile=kubernetes \
> etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
2023/05/30 16:09:16 [INFO] generate received request
2023/05/30 16:09:16 [INFO] received CSR
2023/05/30 16:09:16 [INFO] generating key: rsa-2048
2023/05/30 16:09:16 [INFO] encoded CSR
2023/05/30 16:09:16 [INFO] signed certificate with serial number 248129067188441735912739568354554758895102402787
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
4.1.2. 拷貝到其他master節(jié)點
[root@k8s-master01 pki]# Master='k8s-master02 k8s-master03'
[root@k8s-master01 pki]# for NODE in $Master; do ssh $NODE "mkdir -p /etc/etcd/ssl"; for FILE in etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem; do scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}; done; done
[root@k8s-master01 pki]#
4.2. 生成k8s相關證書
4.2.1. 在所有master、node節(jié)點上創(chuàng)建存放目錄
[root@k8s-master01 pki]# mkdir -pv /etc/kubernetes/pki
mkdir: created directory '/etc/kubernetes'
mkdir: created directory '/etc/kubernetes/pki'
[root@k8s-master01 pki]#
4.2.2. 在master01上生成k8s證書
[root@k8s-master01 pki]# cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
2023/05/30 16:10:46 [INFO] generating a new CA key and certificate from CSR
2023/05/30 16:10:46 [INFO] generate received request
2023/05/30 16:10:46 [INFO] received CSR
2023/05/30 16:10:46 [INFO] generating key: rsa-2048
2023/05/30 16:10:46 [INFO] encoded CSR
2023/05/30 16:10:46 [INFO] signed certificate with serial number 574071817798203017627587862320271427815435810683
[root@k8s-master01 pki]#
# 生成一個根證書 ，多寫了一些IP作為預留IP，為將來添加node做準備
# 192.168.200.1是service網段的第一個地址，需要計算，192.168.1.51為高可用vip地址
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/ca.pem \
> -ca-key=/etc/kubernetes/pki/ca-key.pem \
> -config=ca-config.json \
> -hostname=192.168.200.1,192.168.1.51,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,x.oiox.cn,k.oiox.cn,l.oiox.cn,o.oiox.cn,192.168.1.11,192.168.1.12,192.168.1.13,192.168.1.14,192.168.1.15,192.168.1.21,192.168.1.22,192.168.1.23,192.168.1.24,192.168.1.25 \
> -profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
2023/05/30 16:13:35 [INFO] generate received request
2023/05/30 16:13:35 [INFO] received CSR
2023/05/30 16:13:35 [INFO] generating key: rsa-2048
2023/05/30 16:13:36 [INFO] encoded CSR
2023/05/30 16:13:36 [INFO] signed certificate with serial number 658274562220013957688165987048475892160489307457
[root@k8s-master01 pki]#
4.2.3. 生成apiserver聚合證書
[root@k8s-master01 pki]# cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca
2023/05/30 16:14:48 [INFO] generating a new CA key and certificate from CSR
2023/05/30 16:14:48 [INFO] generate received request
2023/05/30 16:14:48 [INFO] received CSR
2023/05/30 16:14:48 [INFO] generating key: rsa-2048
2023/05/30 16:14:48 [INFO] encoded CSR
2023/05/30 16:14:48 [INFO] signed certificate with serial number 8630292230465875024539278408893194099227737614
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/front-proxy-ca.pem \
> -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem \
> -config=ca-config.json \
> -profile=kubernetes front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client
2023/05/30 16:15:05 [INFO] generate received request
2023/05/30 16:15:05 [INFO] received CSR
2023/05/30 16:15:05 [INFO] generating key: rsa-2048
2023/05/30 16:15:05 [INFO] encoded CSR
2023/05/30 16:15:05 [INFO] signed certificate with serial number 303669102784616323062144323184496796745641083627
2023/05/30 16:15:05 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master01 pki]#
4.2.4. 生成controller-manage的證書
在后面步驟會選擇使用那種高可用方案，有兩種可選方案。
-
haproxy、keepalived那么為--server=https://192.168.1.51:8443 -
nginx方案，那么為--server=https://127.0.0.1:8443
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/ca.pem \
> -ca-key=/etc/kubernetes/pki/ca-key.pem \
> -config=ca-config.json \
> -profile=kubernetes manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager
2023/05/30 16:18:00 [INFO] generate received request
2023/05/30 16:18:00 [INFO] received CSR
2023/05/30 16:18:00 [INFO] generating key: rsa-2048
2023/05/30 16:18:00 [INFO] encoded CSR
2023/05/30 16:18:00 [INFO] signed certificate with serial number 155976945894188104386508452003412264154900957782
2023/05/30 16:18:00 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master01 pki]#
# 若使用 haproxy、keepalived 那么為 `--server=https://192.168.1.51:8443`
# 若使用 nginx方案，那么為 `--server=https://127.0.0.1:8443`
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.1.51:8443 \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]#
# 設置一個環(huán)境項，一個上下文
[root@k8s-master01 pki]# kubectl config set-context system:kube-controller-manager@kubernetes \
> --cluster=kubernetes \
> --user=system:kube-controller-manager \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Context "system:kube-controller-manager@kubernetes" created.
[root@k8s-master01 pki]#
# 設置一個用戶項
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-controller-manager \
> --client-certificate=/etc/kubernetes/pki/controller-manager.pem \
> --client-key=/etc/kubernetes/pki/controller-manager-key.pem \
> --embed-certs=true \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
User "system:kube-controller-manager" set.
[root@k8s-master01 pki]#
# 設置默認環(huán)境
[root@k8s-master01 pki]# kubectl config use-context system:kube-controller-manager@kubernetes \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Switched to context "system:kube-controller-manager@kubernetes".
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/ca.pem \
> -ca-key=/etc/kubernetes/pki/ca-key.pem \
> -config=ca-config.json \
> -profile=kubernetes \
> scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler
2023/05/30 16:21:15 [INFO] generate received request
2023/05/30 16:21:15 [INFO] received CSR
2023/05/30 16:21:15 [INFO] generating key: rsa-2048
2023/05/30 16:21:16 [INFO] encoded CSR
2023/05/30 16:21:16 [INFO] signed certificate with serial number 513889285908077142167858220511113123828996219720
2023/05/30 16:21:16 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master01 pki]#
4.2.5. 生成scheduler證書
- 使用 haproxy、keepalived 那么為
--server=https://192.168.1.51:8443 - 使用 nginx方案，那么為
--server=https://127.0.0.1:8443
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.1.51:8443 \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-scheduler \
> --client-certificate=/etc/kubernetes/pki/scheduler.pem \
> --client-key=/etc/kubernetes/pki/scheduler-key.pem \
> --embed-certs=true \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
User "system:kube-scheduler" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context system:kube-scheduler@kubernetes \
> --cluster=kubernetes \
> --user=system:kube-scheduler \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Context "system:kube-scheduler@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context system:kube-scheduler@kubernetes \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Switched to context "system:kube-scheduler@kubernetes".
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/ca.pem \
> -ca-key=/etc/kubernetes/pki/ca-key.pem \
> -config=ca-config.json \
> -profile=kubernetes \
> admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin
2023/05/30 16:26:11 [INFO] generate received request
2023/05/30 16:26:11 [INFO] received CSR
2023/05/30 16:26:11 [INFO] generating key: rsa-2048
2023/05/30 16:26:11 [INFO] encoded CSR
2023/05/30 16:26:11 [INFO] signed certificate with serial number 486734444855951345260685497901930525877841269948
2023/05/30 16:26:11 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master01 pki]#
4.2.6. 生成admin證書
- 使用 haproxy、keepalived 那么為
--server=https://192.168.1.51:8443 - 使用 nginx方案，那么為
--server=https://127.0.0.1:8443
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.1.51:8443 \
> --kubeconfig=/etc/kubernetes/admin.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials kubernetes-admin \
> --client-certificate=/etc/kubernetes/pki/admin.pem \
> --client-key=/etc/kubernetes/pki/admin-key.pem \
> --embed-certs=true \
> --kubeconfig=/etc/kubernetes/admin.kubeconfig
User "kubernetes-admin" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context kubernetes-admin@kubernetes \
> --cluster=kubernetes \
> --user=kubernetes-admin \
> --kubeconfig=/etc/kubernetes/admin.kubeconfig
Context "kubernetes-admin@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
Switched to context "kubernetes-admin@kubernetes".
[root@k8s-master01 pki]#
4.2.7. 創(chuàng)建kube-proxy證書
[root@k8s-master01 pki]# cfssl gencert \
> -ca=/etc/kubernetes/pki/ca.pem \
> -ca-key=/etc/kubernetes/pki/ca-key.pem \
> -config=ca-config.json \
> -profile=kubernetes \
> kube-proxy-csr.json | cfssljson -bare /etc/kubernetes/pki/kube-proxy
2023/05/30 16:31:22 [INFO] generate received request
2023/05/30 16:31:22 [INFO] received CSR
2023/05/30 16:31:22 [INFO] generating key: rsa-2048
2023/05/30 16:31:22 [INFO] encoded CSR
2023/05/30 16:31:22 [INFO] signed certificate with serial number 35526724972729304166330688726371526418998211500
2023/05/30 16:31:22 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.1.51:8443 \
> --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials kube-proxy \
> --client-certificate=/etc/kubernetes/pki/kube-proxy.pem \
> --client-key=/etc/kubernetes/pki/kube-proxy-key.pem \
> --embed-certs=true \
> --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
User "kube-proxy" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context kube-proxy@kubernetes \
> --cluster=kubernetes \
> --user=kube-proxy \
> --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
Context "kube-proxy@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context kube-proxy@kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
Switched to context "kube-proxy@kubernetes".
[root@k8s-master01 pki]#
4.2.8. 創(chuàng)建ServiceAccount Key – secret
[root@k8s-master01 pki]# openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
[root@k8s-master01 pki]#
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
writing RSA key
[root@k8s-master01 pki]#
4.2.9. 將證書發(fā)送到其他的master節(jié)點
[root@k8s-master01 pki]# mkdir /etc/kubernetes/pki/ -p
[root@k8s-master01 pki]# for NODE in k8s-master02 k8s-master03; do for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE}; done; for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE}; done; done
4.2.10. 查看證書
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/
admin.csr apiserver-key.pem ca.pem front-proxy-ca.csr front-proxy-client-key.pem kube-proxy.pem scheduler-key.pem
admin-key.pem apiserver.pem controller-manager.csr front-proxy-ca-key.pem front-proxy-client.pem sa.key scheduler.pem
admin.pem ca.csr controller-manager-key.pem front-proxy-ca.pem kube-proxy.csr sa.pub
apiserver.csr ca-key.pem controller-manager.pem front-proxy-client.csr kube-proxy-key.pem scheduler.csr
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/ |wc -l
26
[root@k8s-master01 pki]#
5. k8s組件配置
5.1. etcd配置
5.1.1. master01配置
cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.1.11:2380'
listen-client-urls: 'https://192.168.1.11:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.11:2380'
advertise-client-urls: 'https://192.168.1.11:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.11:2380,k8s-master02=https://192.168.1.12:2380,k8s-master03=https://192.168.1.13:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
5.1.2. master02配置
cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.1.12:2380'
listen-client-urls: 'https://192.168.1.12:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.12:2380'
advertise-client-urls: 'https://192.168.1.12:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.11:2380,k8s-master02=https://192.168.1.12:2380,k8s-master03=https://192.168.1.13:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
5.1.3. master03配置
cat > /etc/etcd/etcd.config.yml << EOF
name: 'k8s-master03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.1.13:2380'
listen-client-urls: 'https://192.168.1.13:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.13:2380'
advertise-client-urls: 'https://192.168.1.13:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.11:2380,k8s-master02=https://192.168.1.12:2380,k8s-master03=https://192.168.1.13:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
5.2. 創(chuàng)建etcd service（所有master節(jié)點）
5.2.1. 創(chuàng)建服務
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF
5.2.2. 創(chuàng)建etcd證書目錄并啟動
[root@k8s-master01 pki]# mkdir -pv /etc/kubernetes/pki/etcd
mkdir: created directory '/etc/kubernetes/pki/etcd'
[root@k8s-master01 pki]# ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
[root@k8s-master01 pki]# systemctl daemon-reload
[root@k8s-master01 pki]# systemctl enable --now etcd
Created symlink /etc/systemd/system/etcd3.service → /usr/lib/systemd/system/etcd.service.
Created symlink /etc/systemd/system/multi-user.target.wants/etcd.service → /usr/lib/systemd/system/etcd.service.
[root@k8s-master01 pki]#
5.2.3. 查看etcd狀態(tài)
[root@k8s-master01 pki]# export ETCDCTL_API=3;etcdctl --endpoints="192.168.1.13:2379,192.168.1.12:2379,192.168.1.11:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem endpoint status --write-out=table
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.1.13:2379 | 40ba37809e1a423f | 3.5.9 | 20 kB | false | false | 2 | 9 | 9 | |
| 192.168.1.12:2379 | ac7e57d44f030e8 | 3.5.9 | 20 kB | false | false | 2 | 9 | 9 | |
| 192.168.1.11:2379 | ace8d5b0766b3d92 | 3.5.9 | 20 kB | true | false | 2 | 9 | 9 | |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
[root@k8s-master01 pki]#
6. 高可用配置
- 使用
nginx方案，那么為--server=https://127.0.0.1:8443 - 使用
haproxy、keepalived那么為--server=https://192.168.0.36:8443
6.1. NGINX高可用方案
所有節(jié)點執(zhí)行
# 安裝編譯環(huán)境
yum install gcc -y
# 下載解壓nginx二進制文件
# wget http://nginx.org/download/nginx-1.22.1.tar.gz
tar xvf nginx-*.tar.gz
cd nginx-*
# 進行編譯
./configure --with-stream --without-http --without-http_uwsgi_module --without-http_scgi_module --without-http_fastcgi_module
make && make install
# 拷貝編譯好的nginx
node='k8s-master02 k8s-master03 k8s-node01 k8s-node02 k8s-node03'
for NODE in $node; do scp -r /usr/local/nginx/ $NODE:/usr/local/nginx/; done
6.1.1. 寫入啟動配置
# 寫入nginx配置文件
cat > /usr/local/nginx/conf/kube-nginx.conf <<EOF
worker_processes 1;
events {
worker_connections 1024;
}
stream {
upstream backend {
least_conn;
hash $remote_addr consistent;
server 192.168.0.31:6443 max_fails=3 fail_timeout=30s;
server 192.168.0.32:6443 max_fails=3 fail_timeout=30s;
server 192.168.0.33:6443 max_fails=3 fail_timeout=30s;
}
server {
listen 127.0.0.1:8443;
proxy_connect_timeout 1s;
proxy_pass backend;
}
}
EOF
# 寫入啟動配置文件
cat > /etc/systemd/system/kube-nginx.service <<EOF
[Unit]
Description=kube-apiserver nginx proxy
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=forking
ExecStartPre=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx -t
ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx
ExecReload=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx -s reload
PrivateTmp=true
Restart=always
RestartSec=5
StartLimitInterval=0
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
# 設置開機自啟
systemctl enable --now kube-nginx
systemctl restart kube-nginx
systemctl status kube-nginx
6.2. keepalived和haproxy高可用方案
6.2.1. 安裝keepalived和haproxy服務
本次環(huán)境中，復用master節(jié)點作為高可用節(jié)點，安裝跟部署keeplived和haproxy
[root@k8s-master01 pki]# yum -y install keepalived haproxy
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered with an entitlement server. You can use subscription-manager to register.
Last metadata expiration check: 3:01:36 ago on Tue 30 May 2023 01:57:40 PM CST.
Dependencies resolved.
=====================================================================================================================================================
Package Architecture Version Repository Size
=====================================================================================================================================================
Installing:
haproxy x86_64 2.4.17-6.el9 aliyun-app 2.2 M
keepalived x86_64 2.2.4-6.el9 aliyun-app 548 k
Installing dependencies:
mariadb-connector-c x86_64 3.2.6-1.el9 aliyun-app 198 k
mariadb-connector-c-config noarch 3.2.6-1.el9 aliyun-app 11 k
net-snmp-agent-libs x86_64 1:5.9.1-9.el9 aliyun-app 694 k
net-snmp-libs x86_64 1:5.9.1-9.el9 aliyun-app 756 k
Transaction Summary
=====================================================================================================================================================
Install 6 Packages
Total download size: 4.3 M
Installed size: 14 M
Downloading Packages:
(1/6): mariadb-connector-c-3.2.6-1.el9.x86_64.rpm 286 kB/s | 198 kB 00:00
(2/6): mariadb-connector-c-config-3.2.6-1.el9.noarch.rpm 69 kB/s | 11 kB 00:00
(3/6): keepalived-2.2.4-6.el9.x86_64.rpm 354 kB/s | 548 kB 00:01
(4/6): net-snmp-agent-libs-5.9.1-9.el9.x86_64.rpm 458 kB/s | 694 kB 00:01
(5/6): net-snmp-libs-5.9.1-9.el9.x86_64.rpm 496 kB/s | 756 kB 00:01
(6/6): haproxy-2.4.17-6.el9.x86_64.rpm 432 kB/s | 2.2 MB 00:05
-----------------------------------------------------------------------------------------------------------------------------------------------------
Total 860 kB/s | 4.3 MB 00:05
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : net-snmp-libs-1:5.9.1-9.el9.x86_64 1/6
Installing : mariadb-connector-c-config-3.2.6-1.el9.noarch 2/6
Installing : mariadb-connector-c-3.2.6-1.el9.x86_64 3/6
Installing : net-snmp-agent-libs-1:5.9.1-9.el9.x86_64 4/6
Installing : keepalived-2.2.4-6.el9.x86_64 5/6
Running scriptlet: keepalived-2.2.4-6.el9.x86_64 5/6
Running scriptlet: haproxy-2.4.17-6.el9.x86_64 6/6
Installing : haproxy-2.4.17-6.el9.x86_64 6/6
Running scriptlet: haproxy-2.4.17-6.el9.x86_64 6/6
Verifying : haproxy-2.4.17-6.el9.x86_64 1/6
Verifying : keepalived-2.2.4-6.el9.x86_64 2/6
Verifying : mariadb-connector-c-3.2.6-1.el9.x86_64 3/6
Verifying : mariadb-connector-c-config-3.2.6-1.el9.noarch 4/6
Verifying : net-snmp-agent-libs-1:5.9.1-9.el9.x86_64 5/6
Verifying : net-snmp-libs-1:5.9.1-9.el9.x86_64 6/6
Installed products updated.
Installed:
haproxy-2.4.17-6.el9.x86_64 keepalived-2.2.4-6.el9.x86_64 mariadb-connector-c-3.2.6-1.el9.x86_64
mariadb-connector-c-config-3.2.6-1.el9.noarch net-snmp-agent-libs-1:5.9.1-9.el9.x86_64 net-snmp-libs-1:5.9.1-9.el9.x86_64
Complete!
[root@k8s-master01 pki]#
6.2.2. 修改haproxy配置文件（所有節(jié)點配置文件一致）
# cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
cat >/etc/haproxy/haproxy.cfg<<"EOF"
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-in
bind *:33305
mode http
option httplog
monitor-uri /monitor
frontend k8s-master
bind 0.0.0.0:8443
bind 127.0.0.1:8443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 192.168.1.11:6443 check
server k8s-master02 192.168.1.12:6443 check
server k8s-master03 192.168.1.13:6443 check
EOF
6.2.3. Master01上配置keeplived master節(jié)點
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER # 主節(jié)點為MASTER，備節(jié)點為BACKUP；同一套環(huán)境只運行存在一個MASTER
interface ens16 # 網卡名稱
mcast_src_ip 192.168.1.11 # 本機地址
virtual_router_id 51 # 路由ID，同一套環(huán)境中必須唯一
priority 100 # 權重；優(yōu)先級；多個節(jié)點的優(yōu)先級不同
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.1.51 # 浮動地址
}
track_script {
chk_apiserver
}
}
EOF
6.2.4. Master02上配置keeplived
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens16
mcast_src_ip 192.168.1.12
virtual_router_id 51
priority 80
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.1.51
}
track_script {
chk_apiserver
}
}
EOF
6.2.5. Master03上配置keeplived
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens16
mcast_src_ip 192.168.1.13
virtual_router_id 51
priority 50
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.1.51
}
track_script {
chk_apiserver
}
}
EOF
6.2.6. 健康檢查腳本配置(haroxy、keepalived節(jié)點)
cat > /etc/keepalived/check_apiserver.sh << EOF
#!/bin/bash
err=0
for k in \$(seq 1 3)
do
check_code=\$(pgrep haproxy)
if [[ \$check_code == "" ]]; then
err=\$(expr \$err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ \$err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
EOF
# 給腳本授權
chmod +x /etc/keepalived/check_apiserver.sh
6.2.7. 啟動服務
[root@k8s-master01 pki]# systemctl daemon-reload
[root@k8s-master01 pki]# systemctl enable --now haproxy
Created symlink /etc/systemd/system/multi-user.target.wants/haproxy.service → /usr/lib/systemd/system/haproxy.service.
[root@k8s-master01 pki]# systemctl enable --now keepalived
Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.
[root@k8s-master01 pki]#
6.2.8. 測試高可用
[root@k8s-master01 pki]# ping 192.168.1.51
PING 192.168.1.51 (192.168.1.51) 56(84) bytes of data.
64 bytes from 192.168.1.51: icmp_seq=1 ttl=64 time=0.045 ms
^C
--- 192.168.1.51 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.045/0.045/0.045/0.000 ms
[root@k8s-master01 pki]#
7. k8s組件配置
所有節(jié)點創(chuàng)建以下目錄
[root@k8s-master01 pki]# mkdir -pv /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes
mkdir: created directory '/etc/kubernetes/manifests/'
mkdir: created directory '/var/lib/kubelet'
[root@k8s-master01 pki]#
7.1. 創(chuàng)建apiserver(所有master節(jié)點)
7.1.1. master01節(jié)點配置
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--advertise-address=192.168.1.11 \
--service-cluster-ip-range=192.168.200.0/22 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.1.11:2379,https://192.168.1.12:2379,https://192.168.1.13:2379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota --authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User \
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
7.1.2. master02節(jié)點配置
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--advertise-address=192.168.1.12 \
--service-cluster-ip-range=192.168.200.0/22 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.1.11:2379,https://192.168.1.12:2379,https://192.168.1.13:2379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User \
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
7.1.3. master03節(jié)點配置
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--advertise-address=192.168.1.13 \
--service-cluster-ip-range=192.168.200.0/22 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.1.11:2379,https://192.168.1.12:2379,https://192.168.1.13:2379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User \
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
7.1.4. 啟動apiserver（所有master節(jié)點）
[root@k8s-master01 pki]# systemctl daemon-reload && systemctl enable --now kube-apiserver
Created symlink /etc/systemd/system/multi-user.target.wants/kube-apiserver.service → /usr/lib/systemd/system/kube-apiserver.service.
[root@k8s-master01 pki]# systemctl status kube-apiserver
7.2. 配置kube-controller-manager service
- 所有master節(jié)點配置，且配置相同
- 192.168.204.0/22為pod網段，按需求設置你自己的網段
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
--v=2 \
--bind-address=0.0.0.0 \
--root-ca-file=/etc/kubernetes/pki/ca.pem \
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
--service-account-private-key-file=/etc/kubernetes/pki/sa.key \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
--leader-elect=true \
--use-service-account-credentials=true \
--node-monitor-grace-period=40s \
--node-monitor-period=5s \
--controllers=*,bootstrapsigner,tokencleaner \
--allocate-node-cidrs=true \
--service-cluster-ip-range=192.168.200.0/22 \
--cluster-cidr=192.168.204.0/22 \
--node-cidr-mask-size-ipv4=24 \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem
# --feature-gates=IPv6DualStack=true
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
7.2.1. 啟動kube-controller-manager，并查看狀態(tài)
[root@k8s-master01 pki]# systemctl daemon-reload;systemctl enable --now kube-controller-manager;systemctl status kube-controller-manager
7.3. 配置kube-scheduler service
7.3.1. 所有master配置，且配置相同
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-scheduler \\
--v=2 \\
--bind-address=0.0.0.0 \\
--leader-elect=true \\
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
7.3.2. 啟動并查看服務狀態(tài)
[root@k8s-master01 pki]# systemctl daemon-reload;systemctl enable --now kube-scheduler; systemctl status kube-scheduler
8. TLS Bootstrapping配置
8.1. 在master01上配置
- 使用
haproxy、keepalived那么為--server=https://192.168.0.36:8443 - 使用
nginx方案，那么為--server=https://127.0.0.1:8443
[root@k8s-master01 kubernetes]# cd bootstrap
[root@k8s-master01 bootstrap]# kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true --server=https://192.168.1.51:8443 \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 bootstrap]#
# token的位置在bootstrap.secret.yaml，如果修改的話到這個文件修改
[root@k8s-master01 bootstrap]# kubectl config set-credentials tls-bootstrap-token-user \
--token=c8ad9c.c9ebc12f00009c35 \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
User "tls-bootstrap-token-user" set.
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]# kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=kubernetes \
--user=tls-bootstrap-token-user \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Context "tls-bootstrap-token-user@kubernetes" created.
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]# kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Switched to context "tls-bootstrap-token-user@kubernetes".
[root@k8s-master01 bootstrap]#
# /etc/kubernetes/admin.kubeconfig拷貝到/root/.kube/下，并重命名為config。否則kubelet命令將無法使用。
# 如果需要在其他master節(jié)點上使用kubelet，則需要將config拷貝過去，否則將無法使用。
[root@k8s-master01 bootstrap]# mkdir -pv /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
mkdir: created directory '/root/.kube'
[root@k8s-master01 bootstrap]#
[root@k8s-master01 .kube]# scp /etc/kubernetes/admin.kubeconfig root@k8s-master02:/root/.kube/config
[root@k8s-master01 .kube]# scp /etc/kubernetes/admin.kubeconfig root@k8s-master03:/root/.kube/config
8.2. 查看集群狀態(tài)，沒問題的話繼續(xù)后續(xù)操作
[root@k8s-master01 bootstrap]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-2 Healthy {"health":"true","reason":""}
etcd-0 Healthy {"health":"true","reason":""}
etcd-1 Healthy {"health":"true","reason":""}
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]#
[root@k8s-master01 bootstrap]# kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-c8ad9c created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created
[root@k8s-master01 bootstrap]#
9. node節(jié)點配置
9.1. 在master01上將證書復制到node節(jié)點
[root@k8s-master01 bootstrap]# cd /etc/kubernetes/
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]# for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02 k8s-node03; do ssh $NODE mkdir -p /etc/kubernetes/pki; for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig kube-proxy.kubeconfig; do scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}; done; done
9.2. kubelet配置
9.2.1. 使用docker作為Runtime（本次未使用）
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
[Service]
ExecStart=/usr/local/bin/kubelet \\
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig \\
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
--config=/etc/kubernetes/kubelet-conf.yml \\
--container-runtime-endpoint=unix:///run/cri-dockerd.sock \\
--node-labels=node.kubernetes.io/node=
[Install]
WantedBy=multi-user.target
EOF
9.2.2. 使用containerd作為Runtime（所有節(jié)點都執(zhí)行）
[root@k8s-master01 kubernetes]# mkdir -pv /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
[root@k8s-master01 kubernetes]# cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service
[Service]
ExecStart=/usr/local/bin/kubelet \\
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig \\
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
--config=/etc/kubernetes/kubelet-conf.yml \\
--node-labels=node.kubernetes.io/node=
# --feature-gates=IPv6DualStack=true
# --container-runtime=remote
# --runtime-request-timeout=15m
# --cgroup-driver=systemd
[Install]
WantedBy=multi-user.target
EOF
[root@k8s-master01 kubernetes]#
9.2.3. 所有k8s節(jié)點創(chuàng)建kubelet的配置文件
[root@k8s-master01 kubernetes]# cat > /etc/kubernetes/kubelet-conf.yml <<EOF
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 192.168.200.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
containerRuntimeEndpoint: unix:///run/containerd/containerd.sock
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
EOF
[root@k8s-master01 kubernetes]#
9.2.4. 啟動服務
[root@k8s-master01 kubernetes]# systemctl daemon-reload;systemctl restart kubelet;systemctl enable --now kubelet;systemctl status kubelet
Created symlink /etc/systemd/system/multi-user.target.wants/kubelet.service → /usr/lib/systemd/system/kubelet.service.
● kubelet.service - Kubernetes Kubelet
Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; preset: disabled)
Active: active (running) since Wed 2023-05-31 11:27:36 CST; 328ms ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 121503 (kubelet)
Tasks: 7 (limit: 22988)
Memory: 15.8M
CPU: 324ms
CGroup: /system.slice/kubelet.service
└─121503 /usr/local/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubele>
May 31 11:27:36 k8s-master01 systemd[1]: Started Kubernetes Kubelet.
May 31 11:27:36 k8s-master01 kubelet[121503]: Flag --container-runtime-endpoint has been deprecated, This parameter should be set via the config fil>
[root@k8s-master01 kubernetes]#
9.2.5. 查看集群
[root@k8s-master01 kubernetes]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready <none> 21m v1.27.1
k8s-master02 Ready <none> 21m v1.27.1
k8s-master03 Ready <none> 21m v1.27.1
k8s-node01 Ready <none> 21m v1.27.1
k8s-node02 Ready <none> 21m v1.27.1
[root@k8s-master01 kubernetes]#
9.2.6. 查看容器運行時
[root@k8s-master01 kubernetes]# kubectl describe node | grep Runtime
Container Runtime Version: containerd://1.7.1
Container Runtime Version: containerd://1.7.1
Container Runtime Version: containerd://1.7.1
Container Runtime Version: containerd://1.7.1
Container Runtime Version: containerd://1.7.1
[root@k8s-master01 kubernetes]#
9.3. kube-proxy配置
9.3.1. 將kubeconfig發(fā)送到其他節(jié)點
[root@k8s-master01 kubernetes]# for NODE in k8s-master02 k8s-master03; do scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig; done
kube-proxy.kubeconfig 100% 6384 6.8MB/s 00:00
kube-proxy.kubeconfig 100% 6384 7.1MB/s 00:00
[root@k8s-master01 kubernetes]# for NODE in k8s-node01 k8s-node02; do scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig; done
kube-proxy.kubeconfig 100% 6384 7.0MB/s 00:00
kube-proxy.kubeconfig 100% 6384 7.3MB/s 00:00
[root@k8s-master01 kubernetes]#
9.3.2. 在所有k8s節(jié)點上配置kube-proxy的service文件
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-proxy \\
--config=/etc/kubernetes/kube-proxy.yaml \\
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
9.3.3. 在所有k8s節(jié)點上添加kube-proxy的配置
[root@k8s-master01 kubernetes]# cat > /etc/kubernetes/kube-proxy.yaml << EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
acceptContentTypes: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 192.168.204.0/22
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
syncPeriod: 30s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
EOF
9.3.4. 啟動kube-proxy
[root@k8s-master01 kubernetes]# systemctl daemon-reload;systemctl restart kube-proxy;systemctl enable --now kube-proxy;systemctl status kube-proxy
Created symlink /etc/systemd/system/multi-user.target.wants/kube-proxy.service → /usr/lib/systemd/system/kube-proxy.service.
● kube-proxy.service - Kubernetes Kube Proxy
Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; preset: disabled)
Active: active (running) since Wed 2023-05-31 12:51:13 CST; 331ms ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 127132 (kube-proxy)
Tasks: 7 (limit: 22988)
Memory: 15.6M
CPU: 199ms
CGroup: /system.slice/kube-proxy.service
├─127132 /usr/local/bin/kube-proxy --config=/etc/kubernetes/kube-proxy.yaml --v=2
└─127181 iptables -w 5 -W 100000 -I OUTPUT -t nat -m comment --comment "kubernetes service portals" -j KUBE-SERVICES
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.766219 127132 shared_informer.go:311] Waiting for caches to sync for service config
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.766281 127132 config.go:315] "Starting node config controller"
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.766292 127132 shared_informer.go:311] Waiting for caches to sync for node config
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.774341 127132 proxier.go:926] "Not syncing ipvs rules until Services and Endpoints >
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.775063 127132 proxier.go:926] "Not syncing ipvs rules until Services and Endpoints >
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.866243 127132 shared_informer.go:318] Caches are synced for endpoint slice config
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.866321 127132 proxier.go:926] "Not syncing ipvs rules until Services and Endpoints >
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.866354 127132 proxier.go:926] "Not syncing ipvs rules until Services and Endpoints >
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.867084 127132 shared_informer.go:318] Caches are synced for node config
May 31 12:51:13 k8s-master01 kube-proxy[127132]: I0531 12:51:13.867189 127132 shared_informer.go:318] Caches are synced for service config
[root@k8s-master01 kubernetes]#
10. 安裝網絡插件
建議操作前打快照，有問題可以回滾。libseccomp版本在2.4以上。
# https://github.com/opencontainers/runc/releases
# 升級runc （所有k8s節(jié)點）
[root@k8s-master01 cby]# install -m 755 /root/runc.amd64 /usr/local/sbin/runc
[root@k8s-master01 cby]# cp -p /usr/local/sbin/runc /usr/local/bin/runc
[root@k8s-master01 cby]# cp -p /usr/local/sbin/runc /usr/bin/runc
[root@k8s-master01 cby]# whereis runc
runc: /usr/bin/runc /usr/local/bin/runc /usr/local/sbin/runc
[root@k8s-master01 cby]#
#下載高于2.4以上的包
yum -y install http://rpmfind.net/linux/centos/8-stream/BaseOS/x86_64/os/Packages/libseccomp-2.5.1-1.el8.x86_64.rpm
#查看當前版本
[root@k8s-master-1 ~]# rpm -qa | grep libseccomp
libseccomp-2.5.1-1.el8.x86_64
10.1. 安裝calico
wget https://github.com/projectcalico/calico/blob/master/manifests/calico-typha.yaml
cp calico-typha.yaml calico.yaml
vim calico.yaml
# calico-config ConfigMap處
"ipam": {
"type": "calico-ipam",
},
- name: IP
value: "autodetect"
- name: CALICO_IPV4POOL_CIDR
value: "172.16.0.0/12"
# 更改倉庫
# 使用docker search 搜索涉及到的鏡像地址。
[root@k8s-master01 kubernetes]# sed -i "s#docker.io/calico/#calico/#g" calico.yaml
[root@k8s-master01 kubernetes]# grep image calico.yaml
image: calico/cni:master
imagePullPolicy: IfNotPresent
image: calico/cni:master
imagePullPolicy: IfNotPresent
image: calico/node:master
imagePullPolicy: IfNotPresent
image: calico/node:master
imagePullPolicy: IfNotPresent
image: calico/kube-controllers:master
imagePullPolicy: IfNotPresent
- image: calico/typha:master
imagePullPolicy: IfNotPresent
[root@k8s-master01 kubernetes]#
# 創(chuàng)建pod
[root@k8s-master01 kubernetes]# kubectl apply -f calico-typha.yaml
poddisruptionbudget.policy/calico-kube-controllers created
poddisruptionbudget.policy/calico-typha created
serviceaccount/calico-kube-controllers created
serviceaccount/calico-node created
serviceaccount/calico-cni-plugin created
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgpfilters.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/caliconodestatuses.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipreservations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrole.rbac.authorization.k8s.io/calico-cni-plugin created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-cni-plugin created
service/calico-typha created
daemonset.apps/calico-node created
deployment.apps/calico-kube-controllers created
deployment.apps/calico-typha created
[root@k8s-master01 kubernetes]#
10.2. 查看容器狀態(tài)
- calico 初始化會很慢 需要耐心等待一下，大約十分鐘左右
- 此步驟我卡了很長時間不成功，就是因為鏡像倉庫下載不下來鏡像。
- 如不成功，參考
POD狀態(tài)查看檢查配置，刪除pod重新創(chuàng)建
[root@k8s-master01 ~]# kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-6747f75cdc-fbvvc 1/1 Running 0 61s
kube-system calico-node-fs7hl 1/1 Running 0 61s
kube-system calico-node-jqz58 1/1 Running 0 61s
kube-system calico-node-khjlg 1/1 Running 0 61s
kube-system calico-node-wmf8q 1/1 Running 0 61s
kube-system calico-node-xc6gn 1/1 Running 0 61s
kube-system calico-typha-6cdc4b4fbc-57snb 1/1 Running 0 61s
11. 安裝CoreDNS
在master01上操作
11.1. 安裝helm
因公司網絡限制，采用二進制方式安裝
# wget https://get.helm.sh/helm-v3.12.0-linux-amd64.tar.gz
[root@k8s-master01 kubernetes]# tar -zxvf helm-v3.12.0-linux-amd64.tar.gz
linux-amd64/
linux-amd64/helm
linux-amd64/README.md
linux-amd64/LICENSE
[root@k8s-master01 kubernetes]# cd linux-amd64/
[root@k8s-master01 linux-amd64]# ls
helm LICENSE README.md
[root@k8s-master01 linux-amd64]# mv helm /usr/local/bin/helm
[root@k8s-master01 linux-amd64]#
11.2. 下載coreDNS安裝包
[root@k8s-master01 cilium]# helm repo add coredns https://coredns.github.io/helm
"coredns" has been added to your repositories
[root@k8s-master01 cilium]#
[root@k8s-master01 coredns]# helm pull coredns/coredns
[root@k8s-master01 coredns]# tar -zxvf coredns-1.24.0.tgz
coredns/Chart.yaml
coredns/values.yaml
coredns/templates/NOTES.txt
coredns/templates/_helpers.tpl
coredns/templates/clusterrole-autoscaler.yaml
coredns/templates/clusterrole.yaml
coredns/templates/clusterrolebinding-autoscaler.yaml
coredns/templates/clusterrolebinding.yaml
coredns/templates/configmap-autoscaler.yaml
coredns/templates/configmap.yaml
coredns/templates/deployment-autoscaler.yaml
coredns/templates/deployment.yaml
coredns/templates/hpa.yaml
coredns/templates/poddisruptionbudget.yaml
coredns/templates/podsecuritypolicy.yaml
coredns/templates/service-metrics.yaml
coredns/templates/service.yaml
coredns/templates/serviceaccount-autoscaler.yaml
coredns/templates/serviceaccount.yaml
coredns/templates/servicemonitor.yaml
coredns/.helmignore
coredns/README.md
[root@k8s-master01 coredns]# cd coredns/
11.3. 修改配置文件
# 修改IP地址
vim values.yaml
cat values.yaml | grep clusterIP:
clusterIP: "192.168.200.10"
[root@k8s-master01 coredns]# cat values.yaml | grep repository
repository: coredns/coredns
repository: coredns/cluster-proportional-autoscaler
[root@k8s-master01 coredns]#
12. 安裝Metrics Server
只在master01上操作
12.1. 安裝metrics-server
在新版的Kubernetes中系統資源的采集均使用Metrics-server，可以通過Metrics采集節(jié)點和Pod的內存、磁盤、CPU和網絡的使用率
# 單機版
wget https://mirrors.chenby.cn/https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
# 高可用版本
wget https://mirrors.chenby.cn/https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/high-availability.yaml
# 修改配置
vim components.yaml
vim high-availability.yaml
---
# 1
defaultArgs:
- --cert-dir=/tmp
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --kubelet-use-node-status-port
- --metric-resolution=15s
- --kubelet-insecure-tls
- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem
- --requestheader-username-headers=X-Remote-User
- --requestheader-group-headers=X-Remote-Group
- --requestheader-extra-headers-prefix=X-Remote-Extra-
# 2
volumeMounts:
- mountPath: /tmp
name: tmp-dir
- name: ca-ssl
mountPath: /etc/kubernetes/pki
# 3
volumes:
- emptyDir: {}
name: tmp-dir
- name: ca-ssl
hostPath:
path: /etc/kubernetes/pki
---
[root@k8s-master01 kubernetes]# cat high-availability.yaml | grep image
image: dyrnq/metrics-server:v0.6.3
imagePullPolicy: IfNotPresent
[root@k8s-master01 kubernetes]#
# 二選一
kubectl apply -f high-availability.yaml
# kubectl apply -f components.yaml
12.2. 稍等片刻查看狀態(tài)
[root@k8s-master01 kubernetes]# kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-master01 265m 6% 2657Mi 75%
k8s-master02 203m 5% 2401Mi 67%
k8s-master03 185m 4% 2422Mi 68%
k8s-node01 114m 2% 1747Mi 49%
k8s-node02 165m 4% 1830Mi 51%
k8s-node03 147m 3% 1667Mi 47%
[root@k8s-master01 kubernetes]#
13. 集群驗證
13.1. 部署pod資源
cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: docker.io/library/busybox:1.28
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
EOF
# 查看
kubectl get pod
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 0 17s
13.2. 用pod解析默認命名空間中的kubernetes
kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17h
kubectl exec busybox -n default -- nslookup kubernetes
3Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
13.3. 測試跨命名空間是否可以解析
kubectl exec busybox -n default -- nslookup kube-dns.kube-system
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kube-dns.kube-system
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
13.4. 每個節(jié)點都必須要能訪問Kubernetes的kubernetes svc 443和kube-dns的service 53
telnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.
telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
curl 10.96.0.10:53
curl: (52) Empty reply from server
13.5. Pod和Pod之前要能通
kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 0 17m 172.27.14.193 k8s-node02 <none> <none>
kubectl get po -n kube-system -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
calico-kube-controllers-5dffd5886b-4blh6 1/1 Running 0 77m 172.25.244.193 k8s-master01 <none> <none>
calico-node-fvbdq 1/1 Running 1 (75m ago) 77m 192.168.0.31 k8s-master01 <none> <none>
calico-node-g8nqd 1/1 Running 0 77m 192.168.0.34 k8s-node01 <none> <none>
calico-node-mdps8 1/1 Running 0 77m 192.168.0.35 k8s-node02 <none> <none>
calico-node-nf4nt 1/1 Running 0 77m 192.168.0.33 k8s-master03 <none> <none>
calico-node-sq2ml 1/1 Running 0 77m 192.168.0.32 k8s-master02 <none> <none>
calico-typha-8445487f56-mg6p8 1/1 Running 0 77m 192.168.0.35 k8s-node02 <none> <none>
calico-typha-8445487f56-pxbpj 1/1 Running 0 77m 192.168.0.31 k8s-master01 <none> <none>
calico-typha-8445487f56-tnssl 1/1 Running 0 77m 192.168.0.34 k8s-node01 <none> <none>
coredns-5db5696c7-67h79 1/1 Running 0 63m 172.25.92.65 k8s-master02 <none> <none>
metrics-server-6bf7dcd649-5fhrw 1/1 Running 0 61m 172.18.195.1 k8s-master03 <none> <none>
# 進入busybox ping其他節(jié)點上的pod
kubectl exec -ti busybox -- sh
/ # ping 192.168.0.34
PING 192.168.0.34 (192.168.0.34): 56 data bytes
64 bytes from 192.168.0.34: seq=0 ttl=63 time=0.358 ms
64 bytes from 192.168.0.34: seq=1 ttl=63 time=0.668 ms
64 bytes from 192.168.0.34: seq=2 ttl=63 time=0.637 ms
64 bytes from 192.168.0.34: seq=3 ttl=63 time=0.624 ms
64 bytes from 192.168.0.34: seq=4 ttl=63 time=0.907 ms
# 可以連通證明這個pod是可以跨命名空間和跨主機通信的
13.6. 創(chuàng)建三個副本，可以看到3個副本分布在不同的節(jié)點上（用完可以刪了）
cat > deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
EOF
kubectl apply -f deployments.yaml
deployment.apps/nginx-deployment created
kubectl get pod
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 0 6m25s
nginx-deployment-9456bbbf9-4bmvk 1/1 Running 0 8s
nginx-deployment-9456bbbf9-9rcdk 1/1 Running 0 8s
nginx-deployment-9456bbbf9-dqv8s 1/1 Running 0 8s
# 刪除nginx
[root@k8s-master01 ~]# kubectl delete -f deployments.yaml
14. 安裝dashboard
[root@k8s-master01 kubernetes]# helm repo add kubernetes-dashboard https://kubernetes.github.io/dashboard/
"kubernetes-dashboard" has been added to your repositories
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]#
[root@k8s-master01 kubernetes]# helm install kubernetes-dashboard kubernetes-dashboard/kubernetes-dashboard --namespace kube-system
NAME: kubernetes-dashboard
LAST DEPLOYED: Thu Jun 1 15:39:17 2023
NAMESPACE: kube-system
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
*********************************************************************************
*** PLEASE BE PATIENT: kubernetes-dashboard may take a few minutes to install ***
*********************************************************************************
Get the Kubernetes Dashboard URL by running:
export POD_NAME=$(kubectl get pods -n kube-system -l "app.kubernetes.io/name=kubernetes-dashboard,app.kubernetes.io/instance=kubernetes-dashboard" -o jsonpath="{.items[0].metadata.name}")
echo https://127.0.0.1:8443/
kubectl -n kube-system port-forward $POD_NAME 8443:8443
[root@k8s-master01 kubernetes]#
14.1. 更改dashboard的svc為NodePort，如果已是請忽略
kubectl edit svc kubernetes-dashboard -n kube-system
type: NodePort
14.2. 查看端口號
[root@k8s-master01 kubernetes]# kubectl get svc kubernetes-dashboard -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes-dashboard NodePort 192.168.203.103 <none> 443:31716/TCP 2m4s
14.3. 創(chuàng)建token
cat > dashboard-user.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kube-system
EOF
kubectl apply -f dashboard-user.yaml
# 創(chuàng)建token
kubectl -n kube-system create token admin-user
14.4. 登錄dashboard
https://192.168.1.11:31716
15. ingress安裝
15.1. 執(zhí)行部署
wget https://mirrors.chenby.cn/https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/cloud/deploy.yaml
vim deploy.yaml
cat deploy.yaml | grep image:
image: registry.cn-hangzhou.aliyuncs.com/chenby/controller:v1.7.0
image: registry.cn-hangzhou.aliyuncs.com/chenby/kube-webhook-certgen:v1.3.0
image: registry.cn-hangzhou.aliyuncs.com/chenby/kube-webhook-certgen:v1.3.0
cat > backend.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: default-http-backend
labels:
app.kubernetes.io/name: default-http-backend
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
app.kubernetes.io/name: default-http-backend
template:
metadata:
labels:
app.kubernetes.io/name: default-http-backend
spec:
terminationGracePeriodSeconds: 60
containers:
- name: default-http-backend
image: registry.cn-hangzhou.aliyuncs.com/chenby/defaultbackend-amd64:1.5
livenessProbe:
httpGet:
path: /healthz
port: 8080
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
ports:
- containerPort: 8080
resources:
limits:
cpu: 10m
memory: 20Mi
requests:
cpu: 10m
memory: 20Mi
---
apiVersion: v1
kind: Service
metadata:
name: default-http-backend
namespace: kube-system
labels:
app.kubernetes.io/name: default-http-backend
spec:
ports:
- port: 80
targetPort: 8080
selector:
app.kubernetes.io/name: default-http-backend
EOF
kubectl apply -f deploy.yaml
kubectl apply -f backend.yaml
cat > ingress-demo-app.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: hello-server
spec:
replicas: 2
selector:
matchLabels:
app: hello-server
template:
metadata:
labels:
app: hello-server
spec:
containers:
- name: hello-server
image: registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/hello-server
ports:
- containerPort: 9000
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nginx-demo
name: nginx-demo
spec:
replicas: 2
selector:
matchLabels:
app: nginx-demo
template:
metadata:
labels:
app: nginx-demo
spec:
containers:
- image: nginx
name: nginx
---
apiVersion: v1
kind: Service
metadata:
labels:
app: nginx-demo
name: nginx-demo
spec:
selector:
app: nginx-demo
ports:
- port: 8000
protocol: TCP
targetPort: 80
---
apiVersion: v1
kind: Service
metadata:
labels:
app: hello-server
name: hello-server
spec:
selector:
app: hello-server
ports:
- port: 8000
protocol: TCP
targetPort: 9000
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-host-bar
spec:
ingressClassName: nginx
rules:
- host: "hello.chenby.cn"
http:
paths:
- pathType: Prefix
path: "/"
backend:
service:
name: hello-server
port:
number: 8000
- host: "demo.chenby.cn"
http:
paths:
- pathType: Prefix
path: "/nginx"
backend:
service:
name: nginx-demo
port:
number: 8000
EOF
# 等創(chuàng)建完成后在執(zhí)行：
kubectl apply -f ingress-demo-app.yaml
kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress-host-bar nginx hello.chenby.cn,demo.chenby.cn 192.168.0.32 80 7s
15.2. 過濾查看ingress端口
# 修改為nodeport
kubectl edit svc -n ingress-nginx ingress-nginx-controller
type: NodePort
[root@hello ~/yaml]# kubectl get svc -A | grep ingress
[root@hello ~/yaml]#
16. FAQ
16.1. POD狀態(tài)查看
kubectl describe pod -n NAMESPACE calico-kube-controllers-POD_NAME
16.2. POD刪除
16.2.1. kubectl 展示搜索出的pod列表（含pod所在的namespace）
kubectl get pod -A | grep <podname>
[root@tcs ~]# kubectl get pod -A |grep yhl
ingress-nginx-yhl-large yhl-large-ingress-nginx-controller-dc666995f-djk8k 1/1 Running 0 46d
ingress-nginx-yhl-large yhl-large-ingress-nginx-controller-dc666995f-fncrq 1/1 Running 0 2m46s
ingress-nginx-yhl-large yhl-large-ingress-nginx-controller-dc666995f-wxz2f 1/1 Running 0 4m30s
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-44z2d 1/1 Running 0 45d
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-nlst8 1/1 Running 0 45d
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-sjqx7 1/1 Running 0 45d
16.2.2. kubectl 刪除pod命令
kubectl delete pod <podname> -n <namespace>
在進行刪除pod命令時，會發(fā)現pod并未被真正刪除，原因是k8s誤認為我們要刪除的pod異常掛了，會啟用容災機制，導致重新在拉起一個新的pod。
故，我們想要正常且徹底的刪除一個pod，必須要先破壞掉他的容災機制，即刪除deployment機制。
16.2.3. 查看deployment信息
kubectl get deployment -n <namespace>
[root@tcs- ~]# kubectl get deployment -n ingress-nginx-yhl
NAME READY UP-TO-DATE AVAILABLE AGE
yhl-ingress-nginx-controller 3/3 3 3 45d
16.2.4. 刪除deployment配置
kubectl delete deployment <deployment名> -n <namespace>
[root@tcs- ~]# kubectl delete deployment yhl-ingress-nginx-controller -n ingress-nginx-yhl
deployment.apps "yhl-ingress-nginx-controller" deleted
然后進行刪除pod命令即可，我刪除deployment后，再次查詢pod發(fā)現，上面的pod已經開始自行刪除了（這步可酌情處理）
kubectl delete pod <podname> -n <namespace>
# 附一個我這邊刪除deployment后pod自行刪除的情況
[root@tcs- ~]# kubectl get pod -A|grep yuhonglei
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-44z2d 1/1 Terminating 0 45d
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-nlst8 1/1 Terminating 0 45d
ingress-nginx-yhl yhl-ingress-nginx-controller-fd565dddc-sjqx7 1/1 Terminating 0 45d
16.3. 命令自動補全
yum install bash-completion -y
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc
16.4. helm服務卸載
問題現象
通過helm install安裝服務失敗，修改chart后重新安裝，提示error: cannot re-use a name that is still in use，執(zhí)行helm uninstall提示Error: uninstall: Release not loaded。
2、問題原因helm install失敗后，服務處于fail或者pending狀態(tài)，使用helm -n {{namespace}} ls 無法找到名稱重復服務，因此，無法重新安裝，也無法卸載。
3、解決辦法
a、使用helm -n <namespace> ls -a 查詢全部，可以看到失敗的服務；
b、使用helm -n <namespace> delete <packagename> 刪除失敗的安裝；
c、使用helm install重新安裝服務。文章來源：http://www.zghlxwxcb.cn/news/detail-690285.html
參考鏈接：文章來源地址http://www.zghlxwxcb.cn/news/detail-690285.html
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