docker-diff

Show filesystem changes in container

$ docker diff [container]

docker diff container

docker diff inspects changes to files or directories on a container's filesystem since the container was created from its base image. The output categorizes each change with a prefix: A for added files, C for changed/modified files, and D for deleted files.
This command is useful for understanding what modifications have occurred within a running or stopped container, which helps in debugging, auditing changes, or determining what should be captured in a new image via docker commit. Only changes in the container's writable layer are reported; the underlying image layers remain unchanged.
The diff operation examines the entire container filesystem, so it may take time for containers with extensive modifications.

docker-container-diff(1), docker-commit(1)