Hi everyone
I apologise if this is a dumb question.
Basically, I think the Docker image has filled up, so I am now unable to update Docker images.

The thing is, I don't really understand what the Docker image even is, or how to make it bigger, or why it's filling up.

I haven't been able to find any helpful guides or explanations that make sense to me so I was hoping someone can help me wrap my monkey brain around this one.

Thank you in advance!

Skye x

In the default configuration, the Docker Image is virtual storage storing all Images, Containers and Volumes. If a container is miss-configured or not really well written, it could happen that it write more data in than the virtual storage is able to store. In that case you get "No Space left on Device" exception. Or there are just too many running container, that could also happen.

 

The first case can be check via the Container Size Button on the Docker Page. It lists all container by file system size. Someone else has to chime in, but I believe that excludes mount-bind paths.

 

If all your containers are running, you could try a docker system prune -af --volumes. This deletes all unused volumes, pending images und stopped containers. Note: Run it at your own risk!

 

To increase the size of the virtual disk, you have to stop your array, head over to Settings -> Docker and increase Docker vDisk size. This will delete all your Docker Data, so make sure everything important is (as it should be) mount-bind into the host system.