Keepalived配置Nginx自动重启

1. 增加nginx 检查脚本

vi /etc/keepalived/check_nginx_alive_or_not.sh

脚本内容如下:

#!/bin/bash
A=`ps -C nginx --no-header | wc -l`
# 判断nginx是否宕机,如果宕机尝试重新启动
if [ $A -eq 0 ];then
      /usr/local/nginx/sbin/nginx
      # 等待3秒检查nginx 如果没有启动成功 则停止keepalived 启动备用机
      sleep 3s
      if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
      killall keepalived
      fi
fi

增加执行权限:

# 增加运行权限
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2秒运行一次
      weight 10 # 运行成功 权重加10
}

3. 在vrrp_ instance 中新增监控脚本

track_script {
      check_nginx_alive # 添加nginx脚本
}

最后脚本预览:

global_defs {
   router_id keep_101
}

vrrp_script check_nginx_alive {
    script "/etc/keepalived/check_nginx_alive_or_not.sh"
    interval 2 #每隔2秒运行一次
    weight 10 # 运行成功 权重加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
    }

    track_script {
      check_nginx_alive # 添加nginx脚本
    }

    virtual_ipaddress {
        192.168.235.150
    }
}

4.重启Keepalived

service keepalived restart

完成上述步骤后,当Nginx宕机后可实现自动重启,实现24小时提供服务。

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