Keepalived_vrrp: Unable to access script `[[`

jmton

　　在Centos 7中配置如下：
　　yum install keepalive -y
版本：
Keepalived v1.3.5 (03/19,2017), git commit v1.3.5-6-g6fa32f2
　　vrrp_script chk_down {
script"[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight -2
}
　　track_script {
chk_down
}
　　touch /etc/keepalived/down #无法手动切换主从
　　查看日志
Keepalived_vrrp[9772]: Unable to access script [[
Dec  5 05:06:18 node71 Keepalived_vrrp[9772]: Disabling track script chk_down since not found
　　解决：
vrrp_script chk_down {
#script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
script "/etc/keepalived/keep_down.sh"
interval 1
}
　　cat  etc/keepalived/keep_down.sh
#!/bin/bash
if [ -f /etc/keepalived/down ];then
weight -2
fi
　　VRRP script(s)

Adds a script to be executed periodically. Its exit code will be

    # recorded for all VRRP instances which are monitoring it.
vrrp_script  {
script | # path of the script to execute
interval   # seconds between script invocations, default 1 second
timeout    # seconds after which script is considered to have failed
weight   # adjust priority by this weight, default 0
rise               # required number of successes for OK transition
fall               # required number of successes for KO transition
user USERNAME [GROUPNAME]   # user/group names to run script under
#   group default to group of user
init_fail                   # assume script initially is in failed state
}