Docker Error: Cannot Restart Container Due to Mount Issue - 'not a directory'

This error message indicates that the Docker daemon is unable to restart a container due to an issue with mounting a file. Specifically, it appears that the process is attempting to mount a file from the host system ('/data/src/mysql/config/my.cnf') onto the container's root filesystem at '/etc/my.cnf'. However, the mount operation is failing with the error message 'not a directory', which suggests that the specified host path is not a directory as expected.

To resolve this issue, you should first verify that the specified host path exists and is indeed a file, not a directory. If the path is incorrect or does not exist, you will need to correct it. If the path is correct, you may need to check the permissions on the file to ensure that it is readable by the Docker daemon.

Once you have verified that the host path is correct and the file is readable by the Docker daemon, you can try restarting the container again. If the issue persists, you may need to further troubleshoot the container configuration to identify the root cause of the problem.