Copying from and to a container

Approach 1: Volumes. Enough said.

Approach 2: docker cp from host.

Copy a file from a container (use container id or name)

$ docker cp container_name:/path/to/file /path/to/target/file

Copy a file to a container (use container id or name)

$ docker cp /path/to/file container_name:/path/to/file/inside