Docker containers are not accessible via the public server IP address and only run on localhost

Symptoms

• Plesk Obsidian running on a Linux-based operating system
• Docker containers are not accessible via the public server IP address and only run on localhost (127.0.0.1)
• The Docker extension in Plesk > Extensions > My Extensions is version 1.6.3 or above
• The line {"ip":"127.0.0.1"} is present within the /etc/docker/daemon.json file:
  

  # root@server:~# cat /etc/docker/daemon.json
  {"ip":"127.0.0.1"}

Cause

The line {"ip":"127.0.0.1"} in /etc/docker/daemon.json makes the ports of all Docker containers only accessible on a local server level.

This issued is tied to the changes mentioned in the following Plesk Change Log entries:

Docker extension 1.6.3 | The container ports are no longer available to the outside world. (PPPM-9222)

Docker extension 1.6.4 | Reverted the changes made in version 1.6.3: “The container ports are no longer available to the outside world. (PPPM-9222)”

Resolution

In order to resolve the issue, you should follow these steps:

1. Log into the server via SSH as the root user
2. Open the /etc/docker/daemon.json file with your favorite command-line text editor
3. Remove the following line:

{"ip":"127.0.0.1"}

4. Save the changes
5. Restart the Docker service by running the following command:

# systemctl restart docker

6. Make sure the containers are started by looking at their status in the Docker Plesk extension