关于Gateway重启失败的问题

问题是这样的：为了保证websocket的服务正常，我在crontab里加了个定时监听的功能，检测服务是否开启若服务没有启动就restart，然而出现的情况是，服务没有启动，crontab也检测到了也执行了重启命令但是就是重启失败，查看日志也没有报异常。请问这是什么原因呢？？？
这是检测代码和重启代码

tcp_status=$(ps -aux | grep /opt/var/www/html/rj/3rdparty/GatewayWorker/start.php | grep -v grep)
if 
then
    php /opt/var/www/html/rj/3rdparty/GatewayWorker/start.php restart -d
fi

日志
cron：

Sep 13 19:17:01 localhost CROND: (root) CMD (/usr/bin/php -f /opt/var/www/html/rj/apps/files/publishhomework.php &>/dev/null 2>&1)
Sep 13 19:17:01 localhost CROND: (root) CMD (/usr/bin/sh /opt/var/www/html/rj/checkRedisAndTcp.sh &>/dev/null 2>&1)
Sep 13 19:18:01 localhost CROND: (root) CMD (/usr/bin/php -f /opt/var/www/html/rj/apps/files/publishhomework.php &>/dev/null 2>&1)
Sep 13 19:18:01 localhost CROND: (root) CMD (/usr/bin/sh /opt/var/www/html/rj/checkRedisAndTcp.sh &>/dev/null 2>&1)
Sep 13 19:19:01 localhost CROND: (root) CMD (/usr/bin/php -f /opt/var/www/html/rj/apps/files/publishhomework.php &>/dev/null 2>&1)
Sep 13 19:19:01 localhost CROND: (root) CMD (/usr/bin/sh /opt/var/www/html/rj/checkRedisAndTcp.sh &>/dev/null 2>&1)
workerman：
2017-09-13 19:17:01 pid:6849 Workerman restart 
2017-09-13 19:17:01 pid:6849 Workerman is stoping ...
2017-09-13 19:17:06 pid:6849 Workerman stop fail
2017-09-13 19:18:01 pid:6869 Workerman restart 
2017-09-13 19:18:01 pid:6869 Workerman is stoping ...
2017-09-13 19:18:06 pid:6869 Workerman stop fail
2017-09-13 19:19:01 pid:6887 Workerman restart 
2017-09-13 19:19:01 pid:6887 Workerman is stoping ...
2017-09-13 19:19:06 pid:6887 Workerman stop fail