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docker-registry-mirror

Containerized app to mirror all docker repositories from one registry to another. The Dockerfile includes skopeo and the registry mirror app.

Specify source and destination registries in config.yml. The script will get a list of all repositories from the source registry and mirror them to the destination using skopeo sync. This process will be executed every $INTERVAL seconds.

Requirements

  • docker >= 18.09.6
  • docker-compose >= 1.24.0

How to

Start by building the docker image running

$ ./build.sh

Place your certificate, certificate key and rootchain in the host machine under /var/certs (you can change the location in docker-compose.yml). If you won't use certificates you can delete that volume mount, or leave it.

Copy the example config:

$ mkdir -p /var/registry-mirror
$ cp config.yml.example /var/registry-mirror/config.yml

Set your values:

  • host: the host:port and path for the registry
  • user: if credentials are used, otherwise leave empty
  • pass: if credentials are used, otherwise leave empty
  • ssl: true to use https, false for http
  • api: in case the api path for the registry differs, add it here
  • transport: transport type. Options: docker (default), dir, yaml. See https://www.mankier.com/1/skopeo-sync

Create directory for registry volume:

$ mkdir /var/registry

Run docker-compose up:

$ docker-compose up -d

The file docker-compose.yml includes a registry, if you only want the mirror:

docker-compose up -d registry-mirror

Other values can be changed in the docker-compose.yml variables, like INTERVAL and config path (CONFIG) and the certificate path/names.