k8s多节点master部署

多节点master2节点部署

从master01节点上拷贝证书文件、配置文件和服务管理文件到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节点上启动各服务并设置开机自启

systemctl enable --now kube-apiserver.service
systemctl enable --now kube-controller-manager.service
systemctl enable --now kube-scheduler.service

查看node节点状态

ln -s /opt/kubernetes/bin/* /usr/local/bin/
kubectl get nodes
kubectl get nodes -o wide			#-o=wide：输出额外信息；对于Pod，将输出Pod所在的Node名
//此时在master02节点查到的node节点状态仅是从etcd查询到的信息，而此时node节点实际上并未与master02节点建立通信连接，因此需要使用一个VIP把node节点与master节点都关联起来

负载均衡部署+keepalived高可用（192.168.80.14/15）

配置nginx的官方在线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，配置四层反向代理负载均衡

##指定k8s群集2台master的节点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 {
......

检查配置文件语法并启动nginx服务

1.检查配置文件语法
nginx -t   

2.启动nginx服务，查看已监听6443端口
systemctl enable --now nginx
netstat -natp | grep nginx 

部署keepalived服务

yum install keepalived -y

修改keepalived配置文件（额外编写健康检查脚本）

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   # 接收邮件地址
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   # 邮件发送地址
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id NGINX_MASTER	#lb01节点的为NGINX_MASTER，lb02节点的为 NGINX_BACKUP
}

#添加一个周期性执行的脚本
vrrp_script check_nginx {
    script "/etc/nginx/check_nginx.sh"	#指定检查nginx存活的脚本路径
}

vrrp_instance VI_1 {
    state MASTER			#lb01节点的为 MASTER，lb02节点的为 BACKUP
    interface ens33			#指定网卡名称 ens33
    virtual_router_id 51	#指定vrid，两个节点要一致
    priority 100			#lb01节点的为 100，lb02节点的为 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配置的脚本
    }
}
==========================================================
##创建nginx状态检查脚本 
vim /etc/nginx/check_nginx.sh
#!/bin/bash
#egrep -cv "grep|$$" 用于过滤掉包含grep 或者 $$ 表示的当前Shell进程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

启动keepalived服务（一定要先启动了nginx服务，再启动keepalived服务）

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

修改node节点上的kubeconfig配置文件

//修改bootstrap.kubeconfig,kubelet.kubeconfig配置文件为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

//重启kubelet和kube-proxy服务
systemctl restart kubelet.service 
systemctl restart kube-proxy.service

在master01节点上操作

1.测试创建pod
kubectl create deployment nginx-test --image=nginx

2.查看Pod的状态信息
kubectl get pod
kubectl get pods -o wide

3.在对应网段的node节点上操作，可以直接使用浏览器或者curl命令访问
curl 172.17.47.2

4.这时在master01节点上查看nginx日志，发现没有权限查看
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节点上，将cluster-admin角色授予用户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上分别创建pod来测试负载均衡
master01：已创建上面的pod
master02：kubectl create deployment nginx-test2222 --image=nginx