Failed to start Docker Application Container Engine

Open Source Projects DockerEngine
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Same issue here. Seems the json conf can’t override the systemd one, which is a bug, IMHO.

I’ve worked around using

In summary

First, delete the hosts entry from the json file.

Create a conf file in /etc/systemd/system/docker.service.d, e.g

/etc/systemd/system/docker.service.d/hosts.conf

Configure the start with the extra options. In my case, ubuntu with systemd, it uses file discovery sockets (fd://), and I added a tcp one.

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2736

Note the empty ExecStart. Seems to be an issue with how systemd declares units.

Save, reload

systemctl daemon-reload

and restart the service

systemctl restart docker.service

You should see the new settings

# systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/docker.service.d
           └─hosts.conf
   Active: active (running) since Thu 2017-07-27 11:45:54 PDT; 3s ago
     Docs: https://docs.docker.com
 Main PID: 20482 (dockerd)
    Tasks: 18 (limit: 4915)
   Memory: 15.3M
      CPU: 351ms
   CGroup: /system.slice/docker.service
           ├─20482 /usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2736
           └─20489 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --
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