docker無法啟動：

1 # systemctl restart docker
2 Job for docker.service failed because the control process exited with error code.
3 See “systemctl status docker.service” and “journalctl -xe” for details.

journalctl -xe的提示資訊為：

1 docker.service: Main process exited, code=exited, status=1/FAILURE
 
2 Failed to start Docker Application Container Engine.
3 docker.service: Unit entered failed state.
4 docker.service: Failed with result 'exit-code'.
5 docker.service: Service hold-off time over, scheduling restart.
6 Stopped Docker Application Container Engine.
7 Starting Docker Application Container Engine...
 
8 Failed to load listeners: no sockets found via socket activation: make sure the service was started by systemd

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解決方法: 

參考：https://forums.docker.com/t/failed-to-load-listeners-no-sockets-found-via-socket-activation-make-sure-the-service-was-started-by-systemd/62505

# sudo
 
 systemctl edit docker.service

之後編輯： 將其中的fd:// 替換為 unix://

之後儲存退出。

測試：

1 $ service docker start
2 $ docker ps -a
3 CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES