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
    }
}

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

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