高可用服务监控nginx状态

利用脚本方式，实现nginx故障，keepalived服务停掉，vip漂移到备服务器上。

一、取nginx端口数量，已配置的有443 和80 端口

#!/bin/bash
web_info=$(ss -lntup|grep nginx|wc -l)
if [ $web_info -lt 2 ]
then
   systemctl stop keepalived
fi

二、脚本添加执行权限

[root@lb1 key]# ll /server/scripts/web_check.sh 
-rwxr-xr-x 1 root root 111 Mar  9 15:05 /server/scripts/web_check.sh

三、编写负载均衡配置文件

[root@lb1 key]# cat /etc/keepalived/keepalived.conf
 ! Configuration File for keepalived
       
       global_defs {
          router_id lb01
       }
       
       vrrp_script check_web {                 
          script "/server/scripts/web_check.sh"  #脚本路径
          interval 2                           
          weight 2                             
       }
       
       vrrp_instance VI_1 {
           state MASTER
           interface eth0
           virtual_router_id 51
           priority 150
           advert_int 1
           authentication {
               auth_type PASS
               auth_pass 1111
           }
           virtual_ipaddress {
               10.0.0.3
           }
           track_script {
             check_web  #调用脚本
           } 
       }	   

四、检查测试

[root@lb1 key]# systemctl stop nginx
[root@lb1 key]# systemctl status keepalived.service