k8s多節(jié)點master部署過程

更新時間：2024年07月30日 09:33:51 作者：xinheng233

這篇文章主要介紹了k8s多節(jié)點master部署過程,具有很好的參考價值,希望對大家有所幫助,如有錯誤或未考慮完全的地方,望不吝賜教

多節(jié)點master2節(jié)點部署

從master01節(jié)點上拷貝證書文件、配置文件和服務(wù)管理文件到master02

scp -r /opt/etcd/ root@192.168.80.16:/opt/
scp -r /opt/kubernetes/ root@192.168.80.16:/opt
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.80.16:/usr/lib/systemd/system/

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://192.168.80.11:2379,https://192.168.80.12:2379,https://192.168.80.13:2379 \
--bind-address=192.168.80.16 \				#修改master02的ip
--secure-port=6443 \
--advertise-address=192.168.80.16 \			#修改master02的ip

在master02節(jié)點上啟動各服務(wù)并設(shè)置開機自啟

systemctl enable --now kube-apiserver.service
systemctl enable --now kube-controller-manager.service
systemctl enable --now 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(guān)聯(lián)起來

負載均衡部署+keepalived高可用（192.168.80.14/15）

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 192.168.80.11:6443;
        server 192.168.80.16:6443;
    }
    server {
        listen 6443;
        proxy_pass k8s-apiserver;
    }
}

http {
......

檢查配置文件語法并啟動nginx服務(wù)

1.檢查配置文件語法
nginx -t   

2.啟動nginx服務(wù)，查看已監(jiān)聽6443端口
systemctl enable --now nginx
netstat -natp | grep nginx

部署keepalived服務(wù)

yum install keepalived -y

修改keepalived配置文件（額外編寫健康檢查腳本）

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(wǎng)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	     #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(wù)（一定要先啟動了nginx服務(wù)，再啟動keepalived服務(wù)）

systemctl enable --now nginx
systemctl enable --now keepalived
ip a    #查看VIP是否生成

修改node節(jié)點上的kubeconfig配置文件

//修改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(wù)
systemctl restart kubelet.service 
systemctl restart kube-proxy.service

在master01節(jié)點上操作

1.測試創(chuàng)建pod
kubectl create deployment nginx-test --image=nginx

2.查看Pod的狀態(tài)信息
kubectl get pod
kubectl get pods -o wide

3.在對應網(wǎng)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 172.17.47.2

4.這時在master01節(jié)點上查看nginx日志，發(fā)現(xiàn)沒有權(quán)限查看
kubectl logs nginx-test-7d965f56df-q8qlp

Error from server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy) (nginx-test-7d965f56df-q8qlp)

5.在master01節(jié)點上，將cluster-admin角色授予用戶system:anonymous
命令：kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous

clusterrolebinding.rbac.authorization.k8s.io/cluster-system-anonymous created

6.再次查看nginx日志
kubectl logs nginx-test-7d965f56df-q8qlp

7.在master01和master02上分別創(chuàng)建pod來測試負載均衡
master01：已創(chuàng)建上面的pod
master02：kubectl create deployment nginx-test2222 --image=nginx