Caching Docker Image on an EBS Volume

You can cache images that you've built or downloaded from the internet on an EBS volume or in a snapshot.

A configuration file has the "dockerDataRoot" parameter. It's a directory on the host OS where the Docker daemon will save all the images.

Specify the mountDir directory for one of the instance volumes and set the dockerDataRoot parameter to the same value (or to a subdirectory of the mountDir directory). Also, consider changing a deletion policy for that volume to "retain", then the volume with the cache will be retained and the next time it just will be attached to the instance.

Example:

# ...

instances:
  - name: aws-1
    provider: aws
    parameters:
      # ...
      dockerDataRoot: /docker
      volumes:
        # ...
        - name: docker
          parameters:
            size: 10
            mountDir: /docker