一、部署CoreDNS
在所有 node 節(jié)點上操作
#上傳 coredns.tar 到 /opt 目錄中
cd /opt
docker load -i coredns.tar
在 master01 節(jié)點上操作文章來源：http://www.zghlxwxcb.cn/news/detail-628488.html
#上傳 coredns.yaml 文件到 /opt/k8s 目錄中，部署 CoreDNS
cd /opt/k8s
kubectl apply -f coredns.yaml
kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-5ffbfd976d-j6shb 1/1 Running 0 32s
#給kubelete綁定角色，賦予管理源權限
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system;anonymous
#DNS 解析測試
kubectl run -it --rm dns-test --image=busybox:1.28.4 sh
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes
Server: 10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local
二、配置高可用
初始化環(huán)境
初始化環(huán)境看這里
//從 master01 節(jié)點上拷貝證書文件、各master組件的配置文件和服務管理文件到 master02 節(jié)點
scp -r /opt/etcd/ root@192.168.80.20:/opt/
scp -r /opt/kubernetes/ root@192.168.80.20:/opt
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.80.20:/usr/lib/systemd/system/
scp -r /root/.kube/ root@192.168.243.104:/root
//修改配置文件kube-apiserver中的IP
vim /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.80.10:2379,https://192.168.80.11:2379,https://192.168.80.12:2379 \
--bind-address=192.168.80.20 \ #修改
--secure-port=6443 \
--advertise-address=192.168.80.20 \ #修改
......
//在 master02 節(jié)點上啟動各服務并設置開機自啟
systemctl start kube-apiserver.service
systemctl enable kube-apiserver.service
systemctl start kube-controller-manager.service
systemctl enable kube-controller-manager.service
systemctl start kube-scheduler.service
systemctl enable kube-scheduler.service
//查看node節(jié)點狀態(tài)
ln -s /opt/kubernetes/bin/* /usr/local/bin/
kubectl get nodes
kubectl get nodes -o wide #-o=wide：輸出額外信息；對于Pod，將輸出Pod所在的Node名
//此時在master02節(jié)點查到的node節(jié)點狀態(tài)僅是從etcd查詢到的信息，而此時node節(jié)點實際上并未與master02節(jié)點建立通信連接，因此需要使用一個VIP把node節(jié)點與master節(jié)點都關聯(lián)起來
三、配置負載均衡
//配置load balancer集群雙機熱備負載均衡（nginx實現負載均衡，keepalived實現雙機熱備）
##### 在lb01、lb02節(jié)點上操作 #####
//配置nginx的官方在線yum源，配置本地nginx的yum源
cat > /etc/yum.repos.d/nginx.repo << 'EOF'
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
EOF
yum install nginx -y
//修改nginx配置文件，配置四層反向代理負載均衡，指定k8s群集2臺master的節(jié)點ip和6443端口
vim /etc/nginx/nginx.conf
events {
worker_connections 1024;
}
#添加
stream {
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.80.10:6443;
server 192.168.80.20:6443;
}
server {
listen 6443;
proxy_pass k8s-apiserver;
}
}
http {
......
//檢查配置文件語法
nginx -t
//啟動nginx服務，查看已監(jiān)聽6443端口
systemctl start nginx
systemctl enable nginx
netstat -natp | grep nginx
//部署keepalived服務
yum install keepalived -y
//修改keepalived配置文件
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
# 接收郵件地址
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
# 郵件發(fā)送地址
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_MASTER #lb01節(jié)點的為 NGINX_MASTER，lb02節(jié)點的為 NGINX_BACKUP
}
#添加一個周期性執(zhí)行的腳本
vrrp_script check_nginx {
script "/etc/nginx/check_nginx.sh" #指定檢查nginx存活的腳本路徑
}
vrrp_instance VI_1 {
state MASTER #lb01節(jié)點的為 MASTER，lb02節(jié)點的為 BACKUP
interface ens33 #指定網卡名稱 ens33
virtual_router_id 51 #指定vrid，兩個節(jié)點要一致
priority 100 #lb01節(jié)點的為 100，lb02節(jié)點的為 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.100/24 #指定 VIP
}
track_script {
check_nginx #指定vrrp_script配置的腳本
}
}
//創(chuàng)建nginx狀態(tài)檢查腳本
vim /etc/nginx/check_nginx.sh
#!/bin/bash
#egrep -cv "grep|$$" 用于過濾掉包含grep 或者 $$ 表示的當前Shell進程ID
count=$(ps -ef | grep nginx | egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
systemctl stop keepalived
fi
chmod +x /etc/nginx/check_nginx.sh
//啟動keepalived服務（一定要先啟動了nginx服務，再啟動keepalived服務）
systemctl start keepalived
systemctl enable keepalived
ip a #查看VIP是否生成
//修改node節(jié)點上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件為VIP
cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig
server: https://192.168.80.100:6443
vim kubelet.kubeconfig
server: https://192.168.80.100:6443
vim kube-proxy.kubeconfig
server: https://192.168.80.100:6443
//重啟kubelet和kube-proxy服務
systemctl restart kubelet.service
systemctl restart kube-proxy.service
//在 lb01 上查看 nginx 和 node 、 master 節(jié)點的連接狀態(tài)
netstat -natp | grep nginx
tcp 0 0 0.0.0.0:6443 0.0.0.0:* LISTEN 44904/nginx: master
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 44904/nginx: master
tcp 0 0 192.168.80.100:6443 192.168.80.12:46954 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.14:45074 192.168.80.10:6443 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.14:53308 192.168.80.20:6443 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.14:53316 192.168.80.20:6443 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.100:6443 192.168.80.11:48784 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.14:45070 192.168.80.10:6443 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.100:6443 192.168.80.11:48794 ESTABLISHED 44905/nginx: worker
tcp 0 0 192.168.80.100:6443 192.168.80.12:46968 ESTABLISHED 44905/nginx: worker
在 master01 節(jié)點上測試
//測試創(chuàng)建pod
kubectl run nginx --image=nginx
//查看Pod的狀態(tài)信息
kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-dbddb74b8-nf9sk 0/1 ContainerCreating 0 33s #正在創(chuàng)建中
kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-dbddb74b8-nf9sk 1/1 Running 0 80s #創(chuàng)建完成，運行中
kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
nginx-dbddb74b8-26r9l 1/1 Running 0 10m 172.17.36.2 192.168.80.15 <none>
//READY為1/1，表示這個Pod中有1個容器
//在對應網段的node節(jié)點上操作，可以直接使用瀏覽器或者curl命令訪問
curl 172.17.36.2
//這時在master01節(jié)點上查看nginx日志，發(fā)現沒有權限查看
kubectl logs nginx-dbddb74b8-nf9sk
四、部署 Dashboard
- 儀表板是基于Web的Kubernetes用戶界面。您可以使用儀表板將容器化應用程序部署到Kubernetes集群，對容器化應用程序進行故障排除，并管理集群本身及其伴隨資源。您可以使用儀表板來概述群集上運行的應用程序，以及創(chuàng)建或修改單個Kubernetes資源（例如部署，作業(yè)，守護進程等）。例如，您可以使用部署向導擴展部署，啟動滾動更新，重新啟動Pod或部署新應用程序。儀表板還提供有關群集中Kubernetes資源狀態(tài)以及可能發(fā)生的任何錯誤的信息。
在 master01 節(jié)點上操作
#上傳 recommended.yaml 文件到 /opt/k8s 目錄中
cd /opt/k8s
vim recommended.yaml
#默認Dashboard只能集群內部訪問，修改Service為NodePort類型，暴露到外部：
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
ports:
- port: 443
targetPort: 8443
nodePort: 30001 #添加
type: NodePort #添加
selector:
k8s-app: kubernetes-dashboard
kubectl apply -f recommended.yaml
#創(chuàng)建service account并綁定默認cluster-admin管理員集群角色
kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
#使用輸出的token登錄Dashboard
https://NodeIP:30001
文章來源地址http://www.zghlxwxcb.cn/news/detail-628488.html
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