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
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
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