Keepalived配置Nginx自动重启

1、增加Nginx重启检测脚本

vim /etc/keepalived/check_nginx_alive_or_not.sh

脚本内容：

#!/bin/bash

A=`ps -C nginx --no-header |wc -l`
# 判断nginx是否宕机，如果宕机了，尝试重启
if [ $A -eq 0 ];then
    /usr/local/nginx/sbin/nginx
    # 等待一小会再次检查nginx，如果没有启动成功，则停止keepalived，使其启动备用机
    sleep 3
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi

添加运行权限：

chmod +x /etc/keepalived/check_nginx_alive_or_not.sh

2、配置Keepalived，监听nginx脚本

vrrp_script check_nginx_alive {
    script "/etc/keepalived/check_nginx_alive_or_not.sh"
    interval 2 # 每隔两秒运行上一行脚本
    weight 10 # 如果脚本运行成功，则升级权重+10
    # weight -10 # 如果脚本运行失败，则升级权重-10
}

3、在vrrp_instance中新增监控的脚本

track_script {
    check_nginx_alive   # 追踪 nginx 脚本
}

4、重启keepalived使配置文件生效

5、例:

global_defs {
   router_id keep_125
}

vrrp_script check_nginx_alive {
    script "/etc/keepalived/check_nginx_alive_or_not.sh"
    interval 2 # 每隔两秒运行上一行脚本
    weight 10 # 如果脚本运行成功，则升级权重+10 
    # weight -10 # 如果脚本运行失败，则升级权重-10 
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.115
    }
    track_script {
       check_nginx_alive   # 追踪 nginx 脚本
    }
}