keepalived的常见的健康检查方式

TCP_CHECK tcp端口检测
HTTP_GET http接口检测
MISC_CHECK 自定义脚本检测

tcp端口检测
TCP_CHECK {
    connect_port 80
    connect_timeout 6
    nb_get_retry 3
    delay_before_retry 3
}

http接口检测
HTTP_GET {
    url {
        path /index.html
        status_code 200
    }
    connect_timeout 3
    nb_get_retry 3
    delay_before_retry 3
}

自定义Shell脚本监控，返回0代表检测成功，返回1代表检测失败
MISC_CHECK {
    misc_path "/tmp/shijiange.sh 192.168.237.50"
    misc_timeout 30
}

keepalived检测脚本内容/tmp/shijiange.sh，返回0代表检查正常，返回1代表检查异常
#!/bin/sh
serverip=$1
if [ "$serverip" == "192.168.237.50" ];then
    exit 1
fi
exit 0

实际可用的脚本
#!/bin/sh
serverip=$1
curl -s -m 2 http://$serverip
if [ $? -eq 0 ];then
    exit 0
else
    exit 1
fi