原文网址：https://www.youyong.top/article/115949eb7c3e8
服务器关机了，重启过后，用/etc/init.d/mongod start 启动mongod，居然报错：
Starting mongod (via systemctl):
Job for mongod.service failed because the control process exited with error code.
See "systemctl status mongod.service" and "journalctl -xe" for details.
[FAILED]
