Troubleshooting Common Docker Volume Issues

Permission Denied When Mounting Volumes

If you are mounting a local disc or host directory with the -v option while operating a Docker container, as follows:

docker run -it --rm \
    -p 8888:8888 \
    -v <my-vol>:<container-dir> \
    quay.io/jupyter/minimal-notebook:latest

Incompatible CPU detected

A processor (CPU) that supports virtualization—more especially, the Apple Hypervisor framework—is necessary for Docker Desktop to function. Only Mac computers with CPUs that support the Hypervisor framework may use Docker Desktop.

$ sysctl kern.hv_support

Path Conversion On Windows

When using Linux, mounting a route to another path is handled by the system. For instance, when executing the subsequent command on a Linux system:

 $ docker run --rm -ti -v /home/user/work:/work alpine

Permissions Errors On Data Directories For Shared Volumes

Docker Desktop defaults the read, write, and execute permissions for both users and groups on shared volumes to 0777 when sharing files from Windows.On shared discs, the default permissions are not customisable. You must either utilise non-host-mounted volumes or figure out a means to get the programmes to operate with the default file permissions if you are working with applications that need permissions different from the shared volume defaults during container runtime.

What Is Docker Volume?

Docker containers enable apps to execute in an isolated environment. All modifications made inside the container are lost by default when it ends. Docker volumes and bind mounts can be useful for storing data in between runs. One way to store data outside of containers is with volumes. All volumes are kept in a specific directory on your host, typically /var/lib/docker/volumes for Linux systems, and are controlled by Docker.