Opening Docker to TCP connections

This is the best way i have found to configure docker on my linux boxes to open them up for tcp connections - the tcp connections are used for Portainer to connect to them. I did no do any security, everything is behind a good firewall.

Instructions

The command systemctl edit is used to change the launch parameters of the docker service.

1. Edit the docker service

      > sudo systemctl edit docker
   

2. In the editor, past in the following

      [Service]
      ExecStart=
      ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375
   

   Save the file and exit the editor.
3. Restart docker

       > sudo systemctl restart docker
   

4. Check docker is running with new parameters

       > pgrep -a docker
       21239 /usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375
   

Configure Portainer

1. Login to your portianer instance.
2. Click on Environments.
3. Click on +Add Environment.
4. Choose Docker for Environment Type.
5. Enter a name for the environment in Name under Environment Details.
6. Enter hostname:2375 under Environment URL, where hostname is the hostname of the docker instance.
7. Click +Add environment.