Docker Pull & Save

About

DPNS is a small script to pull a list of docker images and save them into a directory. Later those dumps can be loaded from disk into a local docker engine again.

This might help to sync images for offline docker hosts (w/o access to registries) or running Alpine Linux in diskless mode w/o adding the docker data directory (/var/lib/docker) to the local backup.

The following commands are provided:

• dpns-load - loads docker image dumps into dockerd
• dpns-run - loads docker image dumps and starts configured container stacks
  using docker-compose
• dpns-save - pulls docker image versions and dumps them to disk and removes
  obsolete image dumps

Install on Alpine Linux

It is available in the testing repository of the edge branch:

~ # apk add dpns

Use rc-update to enable dpns to load docker images and run stacks on startup:

~ # rc-update add dpns
 * service dpns added to runlevel sysinit

Configuration

The configuration files are located within of the /etc/dpns directory:

• dpns.conf - base configuration
• images.conf - list of docker images to save and load
• composes.conf - list of docker compose files/directories started by dpns-run