使用keepalive时，发现vrrp_scrpt脚本一直不执行，配置如下：

按照配置，当/etc/keepalived/down存在时，MASTER的优先级会降到80，但是这个脚本一直没有触发。

MASTER

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS
}

vrrp_script chkdown {
    script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
    interval 1
    weight -20
    fall 1
    rise 1
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 151
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 486fcd6f30e1
    }
    track_script {
        chkdown
    }
    virtual_ipaddress {
        192.168.101.231/24 dev ens33 label ens33:0
    }
    debug
}

BACKUP

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS
}

vrrp_script chkdown {
    script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
    interval 1
    weight -20
    fall 1
    rise 1
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 151
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 486fcd6f30e1
    }
    track_script {
        chkdown
    }
    virtual_ipaddress {
        192.168.101.231/24 dev ens33 label ens33:0
    }
    debug
}