Nginx Keepalived配置Nginx自动重启

1 脚本文件

[root@localhost ~]# vi /etc/keepalived/check_nginx_alive_or_not.sh

#!/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

2 设置权限

[root@localhost ~]# chmod +x /etc/keepalived/check_nginx_alive_or_not.sh

3 配置脚本文件

3.1 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，则降低权重-10
}

3.2 在 vrrp_instance 中新增监控的脚本

track_script {
	check_nginx_alive # 追踪 nginx 脚本
}

3.3 重启 Keepalived 服务

[root@localhost ~]# systemctl restart keepalived

4 测试功能

主节点停止nginx服务，会自动重启依然可以正常访问主节点

[root@localhost keepalived]# /usr/local/nginx/sbin/nginx -s quit

主节点继续停止 keepalived服务

[root@localhost keepalived]# systemctl stop keepalived

主节点重新启动 keepalived 服务，nginx 自动启动成功，恢复访问主节点

[root@localhost keepalived]# systemctl start keepalived

5 相关信息

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