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@styblope
Last active May 20, 2024 14:20
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Enable TCP port 2375 for external connection to Docker

Enable TCP port 2375 for external connection to Docker

See this issue.
Docker best practise to Control and configure Docker with systemd.

  1. Create daemon.json file in /etc/docker:

     {"hosts": ["tcp://0.0.0.0:2375", "unix:///var/run/docker.sock"]}
    
  2. Add /etc/systemd/system/docker.service.d/override.conf

     [Service]
     ExecStart=
     ExecStart=/usr/bin/dockerd
    
  3. Reload the systemd daemon:

     systemctl daemon-reload
    
  4. Restart docker:

     systemctl restart docker.service
    
@solarsparq
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ExecStart=
ExecStart=/usr/bin/dockerd --config-file /etc/docker/daemon.json

Thank you. This override.conf trick worked nicely for me. I used daemon.json to supply my TLS configuration as well as listen on 2376. Giving it nothing except a reference to daemon.json feels like a hack to avoid the hosts conflict.. but it works. Thanks again @webzakimbo

root@mnretrogamer029:~# cat /etc/docker/daemon.json
{
"data-root": "/mnt/dietpi_userdata/docker-data",
"log-driver": "journald",
"log-level": "warn",
"debug": false,
"hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2376"],
"tlscacert": "/etc/docker/certs.d/ca.pem",
"tlscert": "/etc/docker/certs.d/server-cert.pem",
"tlskey": "/etc/docker/certs.d/server-key.pem",
"tlsverify": true
}

@parasiteoflife
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what if I don't have systemd? ie. Unraid/Slackware

@jasonmeehan11
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jasonmeehan11 commented Jan 26, 2024

on Ubuntu 22.04.3 couldn't get it to work with these instructions... do this:

Update Docker Configuration:
Edit the Docker daemon configuration file. The configuration file is typically located at /etc/docker/daemon.json. If it doesn't exist, you can create it.

sudo nano /etc/docker/daemon.json

Add the following content to the file:

{
"hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2375"]
}

This configuration tells Docker to listen on both the UNIX socket and a TCP socket on all available network interfaces (0.0.0.0) on port 2375.

Restart Docker:
After making changes to the Docker daemon configuration, you need to restart the Docker daemon for the changes to take effect.

sudo systemctl restart docker

Adjust Firewall Rules (if necessary):
If you have a firewall enabled on your Ubuntu server, make sure to allow traffic on the Docker daemon port (default is 2375). You can use ufw (Uncomplicated Firewall) to do this:

bash

sudo ufw allow 2375

@dmote75
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dmote75 commented Feb 28, 2024

For Synology NAS (I am using DS923+) I found an easier way.
In your compose file for Homepage make sure to have the following listed under 'volumes'
- /var/run/docker.sock:/var/run/docker.sock

Then in your Homepage docker.yaml file, uncomment only this part:

# my-docker:
#   socket: /var/run/docker.sock

Once I did this it's working. Didn't have to mess with anything else.

@fbaligand
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Thanks for your gist! It works great for me, with special case where I use Windows 10 & WSL2!

@HarshDev2
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thanks, it worked for me

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