Kubeadm - K8S1.20 - 高可用集群部署

一.環(huán)境準備

1.系統(tǒng)設置

注意事項：
master節(jié)點cpu核心數要求大于2
●最新的版本不一定好，但相對于舊版本，核心功能穩(wěn)定，但新增功能、接口相對不穩(wěn)
●學會一個版本的 高可用部署，其他版本操作都差不多
●宿主機盡量升級到CentOS 7.9
●內核kernel升級到 4.19+ 這種穩(wěn)定的內核
●部署k8s版本時，盡量找 1.xx.5 這種大于5的小版本（這種一般是比較穩(wěn)定的版本）文章來源地址http://www.zghlxwxcb.cn/news/detail-743600.html

//所有節(jié)點，關閉防火墻規(guī)則，關閉selinux，關閉swap交換
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i 's/enforcing/disabled/' /etc/selinux/config
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab


//修改主機名
hostnamectl set-hostname master01
hostnamectl set-hostname master02
hostnamectl set-hostname master03
hostnamectl set-hostname node01
hostnamectl set-hostname node02


//所有節(jié)點修改hosts文件
vim /etc/hosts
192.168.82.100 master01
192.168.82.101 master02
192.168.82.102 master03
192.168.82.103 node01
192.168.82.104 node02


//所有節(jié)點時間同步
yum -y install ntpdate
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com

systemctl enable --now crond

crontab -e
*/30 * * * * /usr/sbin/ntpdate time2.aliyun.com


//所有節(jié)點實現Linux的資源限制
vim /etc/security/limits.conf
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited


//所有節(jié)點升級內核
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm -O /opt/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm -O /opt/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm

cd /opt/
yum localinstall -y kernel-ml*

#更改內核啟動方式
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
grubby --default-kernel
reboot


//調整內核參數
cat > /etc/sysctl.d/k8s.conf <<EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 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
EOF

#生效參數
sysctl --system  


//加載 ip_vs 模塊
for i in $(ls /usr/lib/modules/$(uname -r)/kernel/net/netfilter/ipvs|grep -o "^[^.]*");do echo $i; /sbin/modinfo -F filename $i >/dev/null 2>&1 && /sbin/modprobe $i;done

二.所有節(jié)點安裝docker

yum install -y yum-utils device-mapper-persistent-data lvm2 
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 
yum install -y docker-ce docker-ce-cli containerd.io

mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://xxxxxxx.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "500m", "max-file": "3"
  }
}
EOF

systemctl daemon-reload
systemctl restart docker.service
systemctl enable docker.service 

docker info | grep "Cgroup Driver"
Cgroup Driver: systemd

三.所有節(jié)點安裝kubeadm，kubelet和kubectl

1.定義kubernetes源

cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet-1.20.15 kubeadm-1.20.15 kubectl-1.20.15

#配置Kubelet使用阿里云的pause鏡像
cat > /etc/sysconfig/kubelet <<EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=systemd --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.2"
EOF


//開機自啟kubelet
systemctl enable --now kubelet

2.高可用組件安裝、配置

//所有 master 節(jié)點部署 Haproxy
yum -y install haproxy keepalived

cat > /etc/haproxy/haproxy.cfg << EOF
global
    log         127.0.0.1 local0 info
    log         127.0.0.1 local1 warning
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon
    stats socket /var/lib/haproxy/stats

defaults
    mode                    tcp
    log                     global
    option                  tcplog
    option                  dontlognull
    option                  redispatch
    retries                 3
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout check           10s
    maxconn                 3000

frontend monitor-in
    bind *:33305
    mode http
    option httplog
    monitor-uri /monitor

frontend k8s-master
    bind *:6444   
    mode tcp
    option tcplog
    default_backend k8s-master

backend k8s-master
    mode tcp
    option tcplog
    option tcp-check
    balance roundrobin
    server k8s-master1 192.168.82.100:6443  check inter 10000 fall 2 rise 2 weight 1
    server k8s-master2 192.168.82.101:6443  check inter 10000 fall 2 rise 2 weight 1
    server k8s-master3 192.168.82.102:6443  check inter 10000 fall 2 rise 2 weight 1
EOF

//所有 master 節(jié)點部署 keepalived
yum -y install keepalived

cd /etc/keepalived/
vim keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_HA1			#路由標識符，每個節(jié)點配置不同
}

vrrp_script chk_haproxy {
    script "/etc/keepalived/check_haproxy.sh"
    interval 2
    weight 2
}

vrrp_instance VI_1 {
    state MASTER				#本機實例狀態(tài)，MASTER/BACKUP，備機配置文件中設置BACKUP
    interface ens33
    virtual_router_id 51
    priority 100				#本機初始權重，備機設置小于主機的值
    advert_int 1
    virtual_ipaddress {
        192.168.82.200          #設置VIP地址
    }
    track_script {
        chk_haproxy
    }
}


vim check_haproxy.sh
#!/bin/bash
if ! killall -0 haproxy; then
    systemctl stop keepalived
fi


systemctl enable --now haproxy
systemctl enable --now keepalived

四.部署K8S集群

//在 master01 節(jié)點上設置集群初始化配置文件
kubeadm config print init-defaults > /opt/kubeadm-config.yaml

cd /opt/
vim kubeadm-config.yaml
......
11 localAPIEndpoint:
12   advertiseAddress: 192.168.82.100		#指定當前master節(jié)點的IP地址
13   bindPort: 6443                         #注意haproxy中的后端端口

21 apiServer:
22   certSANs:								#在apiServer屬性下面添加一個certsSANs的列表，添加所有master節(jié)點的IP地址和集群VIP地址
23   - 192.168.82.200
24   - 192.168.82.100
25   - 192.168.82.101
26   - 192.168.82.102

30 clusterName: kubernetes
31 controlPlaneEndpoint: "192.168.82.200:6444"		#指定集群VIP地址，注意與haproxy的前端訪問端口一致
32 controllerManager: {}

38 imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers			#指定鏡像下載地址
39 kind: ClusterConfiguration
40 kubernetesVersion: v1.20.15				#指定kubernetes版本號
41 networking:
42   dnsDomain: cluster.local
43   podSubnet: "10.244.0.0/16"				#指定pod網段，10.244.0.0/16用于匹配flannel默認網段
44   serviceSubnet: 10.96.0.0/16			#指定service網段
45 scheduler: {}
#末尾再添加以下內容
--- 
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs									#把默認的kube-proxy調度方式改為ipvs模式


#更新集群初始化配置文件
kubeadm config migrate --old-config kubeadm-config.yaml --new-config new.yaml


//所有節(jié)點拉取鏡像
#拷貝yaml配置文件給其他主機，通過配置文件進行拉取鏡像
for i in master02 master03 node01 node02; do scp /opt/new.yaml $i:/opt/; done

kubeadm config images pull --config /opt/new.yaml


//master01 節(jié)點進行初始化
kubeadm init --config new.yaml --upload-certs | tee kubeadm-init.log
#提示：
.........
Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of the control-plane node running the following command on each as root:
#master節(jié)點加入使用的命令，記錄！
  kubeadm join 192.168.82.200:6444 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab86512420215242c4313fb830a4eb98 \
    --control-plane --certificate-key 0f2a7ff2c46ec172f834e237fcca8a02e7c29500746594c25d995b78c92dde96

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:
#node節(jié)點加入使用的命令。記錄！
kubeadm join 192.168.82.200:6444 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab86512420215242c4313fb830a4eb98

#若初始化失敗，進行的操作
kubeadm reset -f
ipvsadm --clear 
rm -rf ~/.kube
再次進行初始化

//master01 節(jié)點進行環(huán)境配置
#配置 kubectl
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

#修改controller-manager和scheduler配置文件
vim /etc/kubernetes/manifests/kube-scheduler.yaml 
vim /etc/kubernetes/manifests/kube-controller-manager.yaml
......
    #- --port=0					#搜索port=0，把這一行注釋掉

systemctl restart kubelet

#部署網絡插件flannel
所有節(jié)點上傳 flannel 鏡像 flannel.tar 和網絡插件 cni-plugins-linux-amd64-v0.8.6.tgz 到 /opt 目錄，master節(jié)點上傳 kube-flannel.yml 文件
cd /opt
docker load < flannel.tar

mv /opt/cni /opt/cni_bak
mkdir -p /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin

kubectl apply -f kube-flannel.yml 


//所有節(jié)點加入集群
#master 節(jié)點加入集群
kubeadm join 192.168.82.200:6444 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab86512420215242c4313fb830a4eb98 \
    --control-plane --certificate-key 0f2a7ff2c46ec172f834e237fcca8a02e7c29500746594c25d995b78c92dde96

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

#node 節(jié)點加入集群
kubeadm join 192.168.82.200:6444 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab86512420215242c4313fb830a4eb98

#在 master01 查看集群信息
kubectl get nodes
NAME       STATUS   ROLES                  AGE    VERSION
master01   Ready    control-plane,master   2h5m   v1.20.15
master02   Ready    control-plane,master   2h5m   v1.20.15
master03   Ready    control-plane,master   2h5m   v1.20.15
node01     Ready    <none>                 2h5m   v1.20.15
node02     Ready    <none>                 2h5m   v1.20.15


kubectl get pod -n kube-system 
NAME                               READY   STATUS    RESTARTS   AGE
coredns-74ff55c5b-4fg44            1/1     Running   2          2h5m
coredns-74ff55c5b-jsdxz            1/1     Running   0          2h5m
etcd-master01                      1/1     Running   1          2h5m
etcd-master02                      1/1     Running   1          2h5m
etcd-master03                      1/1     Running   1          2h5m
kube-apiserver-master01            1/1     Running   1          2h5m
kube-apiserver-master02            1/1     Running   1          2h5m
kube-apiserver-master03            1/1     Running   1          2h5m
kube-controller-manager-master01   1/1     Running   3          2h5m
kube-controller-manager-master02   1/1     Running   1          2h5m
kube-controller-manager-master03   1/1     Running   2          2h5m
kube-flannel-ds-8qtx6              1/1     Running   2          2h4m
kube-flannel-ds-lmzdz              1/1     Running   0          2h4m
kube-flannel-ds-nb9qx              1/1     Running   1          2h4m
kube-flannel-ds-t4l4x              1/1     Running   1          2h4m
kube-flannel-ds-v592x              1/1     Running   1          2h4m
kube-proxy-6gd5j                   1/1     Running   1          2h5m
kube-proxy-f8k96                   1/1     Running   3          2h5m
kube-proxy-h7nrf                   1/1     Running   1          2h5m
kube-proxy-j96b6                   1/1     Running   1          2h5m
kube-proxy-mgmx6                   1/1     Running   0          2h5m
kube-scheduler-master01            1/1     Running   1          2h5m
kube-scheduler-master02            1/1     Running   2          2h5m
kube-scheduler-master03            1/1     Running   2          2h5m

五.問題解決

1.加入集群的 Token 過期

注意：Token值在集群初始化后，有效期為 24小時 ，過了24小時過期。進行重新生成Token，再次加入集群，新生成的Token為 2小時。

1.1、生成Node節(jié)點加入集群的 Token
kubeadm token create --print-join-command
kubeadm join 192.168.82.200:16443 --token menw99.1hbsurvl5fiz119n     --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab865	12420215242c4313fb830a4eb98


1.2、生成Master節(jié)點加入集群的 --certificate-key
kubeadm init phase upload-certs  --upload-certs
I1105 12:33:08.201601   93226 version.go:254] remote version is much newer: v1.22.3; falling back to: stable-1.20
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
38dba94af7a38700c3698b8acdf8e23f273be07877f5c86f4977dc023e333deb

#master節(jié)點加入集群的命令
kubeadm join 192.168.82.200:16443 --token menw99.1hbsurvl5fiz119n     --discovery-token-ca-cert-hash sha256:e76e4525ca29a9ccd5c24142a724bdb6ab86512420215242c4313fb830a4eb98 \
 --control-plane --certificate-key 38dba94af7a38700c3698b8acdf8e23f273be07877f5c86f4977dc023e333deb

2.master節(jié)點 無法部署非系統(tǒng)Pod

解析：主要是因為master節(jié)點被加上污點，污點是不允許部署非系統(tǒng) Pod，在 測試 環(huán)境，可以將污點去除，節(jié)省資源，可利用率。

2.1、查看污點
kubectl  describe node -l node-role.kubernetes.io/master=  | grep Taints
Taints:             node-role.kubernetes.io/master:NoSchedule
Taints:             node-role.kubernetes.io/master:NoSchedule
Taints:             node-role.kubernetes.io/master:NoSchedule


2.2、取消污點
kubectl  taint node  -l node-role.kubernetes.io/master node-role.kubernetes.io/master:NoSchedule-
node/master01 untainted
node/master02 untainted
node/master03 untainted

kubectl  describe node -l node-role.kubernetes.io/master=  | grep Taints
Taints:             <none>
Taints:             <none>
Taints:             <none>

3.修改NodePort的默認端口

原理：默認k8s的使用端口的范圍為30000左右，作為對外部提供的端口。我們也可以通過對配置文件的修改去指定默認的對外端口的范圍。

#報錯
The Service "nginx-svc" is invalid: spec.ports[0].nodePort: Invalid value: 80: provided port is not in the valid range. The range of valid ports is 30000-32767


[root@k8s-master1 ~]# vim /etc/kubernetes/manifests/kube-apiserver.yaml
- --service-cluster-ip-range=10.96.0.0/16
- --service-node-port-range=1-65535    #找到后進行添加即可

#無需重啟，k8s會自動生效

4.外部 etcd 部署配置

kubeadm config print init-defaults > /opt/kubeadm-config.yaml

cd /opt/
vim kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.82.104
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: master01
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  certSANs:
  - 10.96.0.1
  - 127.0.0.1
  - localhost
  - kubernetes
  - kubernetes.default
  - kubernetes.default.svc
  - kubernetes.default.svc.cluster.local
  - 192.168.82.200
  - 192.168.82.100
  - 192.168.82.101
  - 192.168.82.102
  - master01
  - master02
  - master03
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 192.168.82.200:16443
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  external:                                #使用外部etcd的方式
    endpoints:
    - https://192.168.82.100:2379
    - https://192.168.82.101:2379
    - https://192.168.82.102:2379
    caFile: /opt/etcd/ssl/ca.pem           #需要把etcd的證書都復制到所有master節(jié)點上
    certFile: /opt/etcd/ssl/server.pem
    keyFile: /opt/etcd/ssl/server-key.pem
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.20.15
networking:
  dnsDomain: cluster.local
  podSubnet: "10.244.0.0/16"
  serviceSubnet: 10.96.0.0/16
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs

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