keepalived04:执行定制脚本

在MASTER，BACKUP切换后可以执行定制的脚本：
配置实例：

! Configuration File for keepalived

global_defs {
   notification_email {
        [email protected]
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_sync_group VGM {
	group {
         VI_1
    }
    notify_master /path/to/to_master.sh #表示当切换到master状态时，要执行的脚本

    notify_backup /path_to/to_backup.sh #表示当切换到backup状态时，要执行的脚本

    notify_fault "/path/fault.sh VG_1"  #表示切换出现故障时要执行的脚本

}
vrrp_script chk_http_port {
	script "killall -0 httpd"
        interval 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass westos
    }
    track_interface {
		eth0
                eth1
    }
    virtual_ipaddress {
		192.168.0.150/24 dev eth0
                10.0.0.150/24 dev eth1
    }
    track_script {
	chk_http_port
}
}