keepalived检测nginx脚本

当主节点Nginx挂掉，keepalived仍然存活时，此时无法访问主节点，因此需要检测Nginx状态，配置自动重启。

一、新增Nginx状态监测与重启脚本

[root@server01 ~]# cat /etc/keepalived/nginx_check.sh
#!/bin/bash
#Author:Mr.Ding
#Mail:[email protected]
#Created Time:2023-06-18 18:40:37
#Name:/etc/keepalived/nginx_check.sh
#Description:
#Ver:
num=`ps -C nginx --no-header | wc -l`
if [ $num -eq 0 ];then
	systemctl start nginx
	sleep 1
	if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
	systemctl stop keepalived
	fi
fi

给脚本添加权限

chmod +x /etc/keepalived/nginx_check.sh

二、配置keepalived核心文件，定时执行脚本

[root@server01 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 1270.0.01
   smtp_connect_timeout 30
   router_id lb02
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
# 引入脚本
vrrp_script chk_nginx {
	script "/etc/keepalived/nginx_check.sh"
	interval 1　　# 设置执行间隔
	weight 10　　# 运行成功则升级权重+10，否则-10
}

vrrp_instance VI_1 {
    state MASTER
    interface ens34
    virtual_router_id 55
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.24/24 dev ens34 lable ens34:1
    }
　　
　　# 在实例中追踪nginx状态
	track_script {
		chk_nginx
	}
}

 重启keepalived服务，使配置生效。

systemctl restart keepalived.service