How can you extract dump files from a running container and transfer them to the main system?

To extract files from a running Docker container to the host system, you can use the docker cp command.

Example:

docker cp <containerId>:/path/in/container/file_or_folder /path/on/host

For instance, to copy the /app/dump folder from a container with ID abc123 to the current directory on the host:

docker cp abc123:/app/dump ./dump

This allows you to obtain a dump or any other files from the container without needing to stop or modify it.

If you need to get a database dump or another process, usually a dump file is created inside the container and then copied to the host using docker cp.