Keepalived 设置不抢占资源

keepalived做HA时，经常会遇到抢占式的master和backup之间的切换

example:

通常如果master服务死掉后backup会变成master，但是当master服务又好了的时候 master此时会抢占VIP，这样就会发生两次切换对业务繁忙的网站来说是不好的。所以我们要在配置文件加入  nopreempt  非抢占，但是这个参数只能用于state 为backup，故我们在用HA的时候最好master 和backup的state都设置成backup 让其通过priority来竞争。

注意：这样配置后，我们要注意启动keepalived服务的顺序，假设我想让A成为backup那就不能先启动A的keepalived服务。

以下是结合MHA架构主、备库配置事例

主库

[root@MySQLtest ~]# more /etc/keepalived/keepalived.conf
#20140916
#!/bin/bash

global_defs {
    router_id mysqlmha
}

vrrp_script check_run {
  script "/etc/keepalived/check_mysql.sh"
  interval 1
}

vrrp_instance VI_1 {
    state BACKUP    --这里状态指定为backup
    interface eth0
    virtual_router_id 151
    priority 100
    advert_int 1
    nopreempt        --设置 nopreempt 防止抢占资源
    authentication {
        auth_type PASS
        auth_pass 1111
    }

track_script {
        check_run
    }
    virtual_ipaddress {
        192.168.66.53
    }
}

备库

[root@ceshi ~]# more /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
  router_id mysqlmha
}

vrrp_script check_run {
  script "/etc/keepalived/check_mysql.sh"
  interval 1
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 151
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

track_script {
      check_run
    }

virtual_ipaddress {
        192.168.66.53
    }
}

CentOS 6.3下Haproxy+Keepalived+Apache配置笔记

Haproxy + KeepAlived 实现WEB群集 on CentOS 6

Keepalived+Haproxy配置高可用负载均衡

Haproxy+Keepalived构建高可用负载均衡

CentOS 7 上配置LVS + Keepalived + ipvsadm

Keepalived高可用集群搭建

Keepalived 的详细介绍：请点这里
Keepalived 的下载地址：请点这里