文档介绍：+::mysql-:keepalived--VIP:-master1:-master2:#serviceiptablesstop#setenforce0#vi/etc/sysconfig/selinux---------------SELINUX=disabled---------------注:若线上需要开启iptables,需加一条规则使keepalived的vrrp通行#iptables-AINPUT-pvrrp--master1:,实际以本机kernel版本为准#wget tware/keepalived-#tarzxvfkeepalived-#cdkeepalived-#./configure--prefix=/usr/local/keepalived--with-kernel-dir=/usr/src/kernels/-#make&&makeinstall设置keepalived开机启动脚本#cp/usr/local/keepalived/etc//keepalived/etc//#cp/usr/local/keepalived/etc/sysconfig/keepalived/etc/sysconfig/#cp/usr/local/keepalived/sbin/keepalived/usr/sbin/#chkconfigkeepalivedon新建一个配置文件,默认keepalived启动会去/etc/keepalived目录下寻找配置文件#mkdir/etc/keepalived#vi/etc/keepalived/------------------global_defs{notification_email{lzyangel@}#当主、备份设备发生改变时,通过邮件通知notification_email_from ******@-ha}vrrp_instanceVI_1{#在初始化状态下定义为主设备stateBACKUP#注意网卡接口interfaceeth0virtual_router_id51#优先级,另一台改为90priority100advert_int1#不主动抢占资源nopreemptauthentication{#认证方式,可以是PASS或AH两种认证方式auth_typePASS#认证密码auth_pass1111}virtual_ipaddress{#虚拟IP地址,}}{#每个2秒检查一次real_server状态delay_loop2#LVS算法lb_algowrr#LVS模式lb_kindDR#{#权重weight3#检测到服务down后执行的脚本notify_down/etc/{#连接超时时间connect_timeout10#重连次数nb_get_retry3#重连间隔时间delay_before_retry3#健康检查端口connect_port3306}}}----------------------编写检测服务down后所要执行的脚本#vi/etc/-------------#!/bin/sh/etc/-------------#chmod+x/etc/:此脚本是上面配置文件notify_down选项所用到的,keepalived使用notify_down选项来检查real_se