我有一个安装了 Mosquitto 的 AWS EC2、Ubuntu-16.04 实例。我注意到，该mosquitto过程消失了，日志中似乎没有任何明显的内容/var/log/mosquitto/mosquitto.log。

当我运行此命令时，该服务将无法启动！ sudo service mosquitto start

我不知道去哪里寻找才能明白出了什么问题。目前，我正在管理 sudo -u mosquitto /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf &

任何建议在哪里寻找服务启动问题？

systemctl status mosquitto.service 输出

ubuntu@ip-172-xx-xx-xx:~$ systemctl status mosquitto.service
* mosquitto.service - LSB: mosquitto MQTT v3.1 message broker
   Loaded: loaded (/etc/init.d/mosquitto; bad; vendor preset: enabled)
   Active: inactive (dead) since Thu 2018-07-12 07:56:54 IST; 5h 35min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 6552 ExecStop=/etc/init.d/mosquitto stop (code=exited, status=0/SUCCESS)
  Process: 16941 ExecStart=/etc/init.d/mosquitto start (code=exited, status=0/SUCCESS)

Jul 12 07:23:27 ip-172-xx-xx-xx systemd[1]: Started LSB: mosquitto MQTT v3.1 message broker.
Jul 12 07:56:53 ip-172-xx-xx-xx systemd[1]: Stopping LSB: mosquitto MQTT v3.1 message broker...
Jul 12 07:56:54 ip-172-xx-xx-xx mosquitto[6552]:  * Stopping network daemon: mosquitto
Jul 12 07:56:54 ip-172-xx-xx-xx mosquitto[6552]:    ...done.
Jul 12 07:56:54 ip-172-xx-xx-xx systemd[1]: Stopped LSB: mosquitto MQTT v3.1 message broker.
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.