nginx+keepalived 高可用

keepalived 官方下载地址

https://www.keepalived.org/download.html

环境

nginx安装 略

keepalived安装过程

1.登陆245服务器下载解压安装

[root@k8s-nginx1 opt]# wget https://www.keepalived.org/software/keepalived-2.0.19.tar.gz
[root@k8s-nginx1 opt]# tar zxvf keepalived-2.0.19.tar.gz
[root@k8s-nginx1 opt]# cd keepalived-2.0.19
[root@k8s-nginx1 keepalived-2.0.19]# ./configure --sysconf=/etc
[root@k8s-nginx1 keepalived-2.0.19]# make
[root@k8s-nginx1 keepalived-2.0.19]# make install

2.配置

[root@k8s-nginx1 keepalived]# cat /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     nwcao@liunx.com
   }
   notification_email_from ops@liunx.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id NGINX_1
}

vrrp_script nginx {
   script /opt/chk_nginx.sh
   interval 2
   weight -10
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160  #ifconfig 查看名字，例如eth0
    virtual_router_id 51
    priority 100          #权重 
    advert_int 1
    authentication {        #认证信息
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        nginx
    }
    virtual_ipaddress {   #虚拟IP 可以多个
        10.23.215.222
    }
}

检测nginx文件

[root@k8s-nginx1 keepalived]# cat /opt/chk_nginx.sh 
#!/bin/bash
#check nginx server status
nginxpid=$(ps -C nginx --no-header |wc -l)
if [ $nginxpid -eq 0 ];then
    systemctl stop keepalived
    echo "Keepalived stopped, please check your Nginx! " |tee -a /var/log/messages
fi

3.登陆246 重复安装步骤keepalived.conf修改成

[root@k8s-nginx1 keepalived]# cat /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     nwcao@liunx.com
   }
   notification_email_from ops@liunx.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id NGINX_1
}

vrrp_script nginx {
   script /opt/chk_nginx.sh
   interval 2
   weight -10
}

vrrp_instance VI_1 {
    state backup
    interface ens160  #ifconfig 查看名字，例如eth0
    virtual_router_id 51
    priority 90          #权重 
    advert_int 1
    authentication {        #认证信息
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        nginx
    }
    virtual_ipaddress {   #虚拟IP 可以多个
        10.23.215.222
    }
}

4.启动命令systemctl start keepalived

   关闭命令 systemctl stop keepalived

   开机启动命令 systemctl  enable  keepalived

5.测试 正常访问到245页面

关闭245服务器上nginx服务

 

正常切换到246服务器上页面

 

启动245服务器上nginx 启动 keepalived服务

 

页面切换到245服务器

 

 结果符合预期。