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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:1490176741@qq.com
#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

1	`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 {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   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
    }
}