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
# 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
# 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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