高可用Kubernetes集群实战(三)

安装nginx

安装依赖

[root@k8sm1 ~]# yum install -y  epel-release

安装nginx keepalived

[root@k8sm1 ~]# yum install -y nginx  keepalived nginx-mod-stream

配置nginx

[root@k8sm1 ~]# cat /etc/nginx/nginx.conf
# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

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 192.168.1.180:6443 weight=5 max_fails=3 fail_timeout=30s;  
            server 192.168.1.181:6443 weight=5 max_fails=3 fail_timeout=30s;
            server 192.168.1.182:6443 weight=5 max_fails=3 fail_timeout=30s;  

    }

    server {
       listen 16443; # 由于nginx与master节点复用，这个监听端口不能是6443，否则会冲突
       proxy_pass k8s-apiserver;
    }
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 4096;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80;
#        listen       [::]:80;
        server_name  _;
#        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
#       include /etc/nginx/default.d/*.conf;

#        error_page 404 /404.html;
        location / {

        }
        
        location = /404.html {
        }

        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
        }
    }

配置keepalived

[root@k8sm1 keepalived]# cat keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id NGINX_MASTER
}

vrrp_script check_nginx {
  script "/etc/keepalived/check_nginx.sh"
  
}
vrrp_instance VI_1 {
    state MASTER
    interface ens192
    virtual_router_id 51
    priority 100
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.188/24
    }
}

配置nginx 进程检测脚本

[root@k8sm1 keepalived]# cat check_nginx.sh 
#!/bin/bash
counter=$(ps -ef |grep nginx | grep sbin | egrep -cv "grep|$$" )
if [ $counter -eq 0 ]; then
    service nginx start
    sleep 2
    counter=$(ps -ef |grep nginx | grep sbin | egrep -cv "grep|$$" )
    if [ $counter -eq 0 ]; then
        service  keepalived stop
    fi
fi

配置nginx 检测脚本权限

[root@k8sm1 keepalived]# chmod +x check_nginx.sh

启动高可用

重载配置

[root@k8sm1 keepalived]# systemctl daemon-reload

启动nginx 并配置开机自启

[root@k8sm1 keepalived]# systemctl enable nginx --now

启动keepalived并配置开机自启

[root@k8sm1 keepalived]# systemctl enable keepalived --now