containerd/docs/bundle-changes.md

containerd changes to the bundle

Containerd will make changes to the container's bundle by adding additional files or folders by default with options to change the output.

The current change that it makes is if you create a checkpoint of a container the checkpoints will be saved by default in a {bundle}/checkpoints/{checkpoint name} in the bundle of the container. A user can also populate this directory and provide the checkpoint name on the create request so that the container is started from this checkpoint.

As of this point, containerd names no other additions to the bundle and runtime state is currently stored in a tmp filesystem like /run.