[问题] docker: Failed to start Docker Application Container Engine.

docker无法启动：

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

journalctl -xe的提示信息为：

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

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解决方法:

参考：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

之后编辑： 将其中的fd:// 替换为 unix://

之后保存退出。

测试：

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