This script allows the user to easily migrate images, volumes, and containers from one version of Docker to another. With the migrate command, users can quickly save all their data from the current docker instance, change the docker storage backend, and then import all their old data to the new system.
Specify the directory in which to temporarily store the files (can be an existing directory, or the command will create one)
The export command will export all the current images, volumes, and containers to the specified directory, in the /images, /volumes, /containers subdirectories.
Specify the directory from which to read the files (must be an existing directory)
The import command will import images, volumes, and containers from the specified directory into the new docker instance.
Jenny Ramseyer, 2015