docs/content/packages/getting-started-with-github-container-registry/migrating-to-github-container-registry-for-docker-images.md

title, intro, product, versions

title	intro	product	versions
Migrating to GitHub Container Registry for Docker images	If you've used the GitHub Packages Docker registry to store Docker images, you can migrate to the new {% data variables.product.prodname_container_registry %}.	{% data reusables.gated-features.packages %}	free-pro-team *

Key differences between {% data variables.product.prodname_github_container_registry %} and the Docker package registry

{% data reusables.package_registry.container-registry-beta %}

The {% data variables.product.prodname_github_container_registry %} supersedes the existing Packages Docker registry and is optimized to support some of the unique needs of containers.

{% data reusables.package_registry.container-registry-feature-highlights %}

For more information, see "About {% data variables.product.prodname_github_container_registry %}."

Billing changes

{% data reusables.package_registry.billing-for-container-registry %}

Domain changes

The domain for the {% data variables.product.prodname_container_registry %} is ghcr.io.

Registry	Example URL
{% data variables.product.prodname_registry %} Docker registry	docker.pkg.github.com/OWNER/REPOSITORY/IMAGE_NAME
{% data variables.product.prodname_github_container_registry %}	ghcr.io/OWNER/IMAGE_NAME

Authenticating with the container registry

You will need to authenticate to the {% data variables.product.prodname_container_registry %} with the base URL ghcr.io. We recommend creating a new access token for using the {% data variables.product.prodname_container_registry %}.

{% data reusables.package_registry.authenticate_with_pat_for_container_registry %}

{% data reusables.package_registry.authenticate-to-container-registry-steps %}

Migrating a Docker image using the Docker CLI

To move Docker images that you host on {% data variables.product.prodname_registry %} Docker registry, you must republish the images to {% data variables.product.prodname_container_registry %}. We recommend republishing your existing Docker images using the command line on your local machine.

1. Sign in to the Docker registry using a temporary PAT with at least the read:packages scope. This PAT will only be used to sign in to the Docker registry to pull down images and can be deleted afterward. {% raw %}

$ echo $READ_PACKAGES_TOKEN | docker login docker.pkg.github.com -u USERNAME --password-stdin

{% endraw %} 2. Pull down the image you'd like to migrate, replacing OWNER with the name of the user or organization account that owns the repository, REPOSITORY with the name of the repository containing your project, IMAGE_NAME with name of the package or image, VERSION with tag for the image you want to install. For example, docker pull docker.pkg.github.com/octo-org/octoshift/octoshift:latest pulls the latest tag of the octoshift/octoshift image in the octo-org organization.

$ docker pull docker.pkg.github.com/OWNER/REPOSITORY/IMAGE_NAME:VERSION

3. Re-tag the image with the new domain and a new image name. For more information, see "Docker tag" in the Docker documentation. Use the same URL that you used in the previous step for the SOURCE URL. Replace the TARGET_OWNER with the user or organization that you are migrating the container image to and replace the TARGET_IMAGE_NAME with the new {% data variables.product.prodname_container_registry %} image name.

$ docker tag docker.pkg.github.com/SOURCE_OWNER/SOURCE_REPOSITORY/SOURCE_IMAGE_NAME:VERSION ghcr.io/TARGET_OWNER/TARGET_IMAGE_NAME:VERSION

4. Sign in to the new {% data variables.product.prodname_container_registry %}. We recommend creating a new PAT limited to the read:packages and write:packages scopes since you no longer need the repo scope and your previous PAT may not have the write:packages scope. {% raw %}

$ echo $CR_PAT | docker login ghcr.io -u USERNAME --password-stdin

{% endraw %} 5. Push your re-tagged image to the {% data variables.product.prodname_container_registry %}.

$ docker push ghcr.io/OWNER/IMAGE_NAME:VERSION

Updating your {% data variables.product.prodname_actions %} workflow

If you have a {% data variables.product.prodname_actions %} workflow that uses a Docker image from the {% data variables.product.prodname_registry %} Docker registry, you may want to update your workflow to the {% data variables.product.prodname_container_registry %} to allow for anonymous access for public container images, finer-grain access permissions, and better storage and bandwidth compatibility for containers.

1. Migrate your Docker images to the new {% data variables.product.prodname_container_registry %} at ghcr.io. For an example, see "Migrating a Docker image using the Docker CLI."

2. In your {% data variables.product.prodname_actions %} workflow file, update the package url from https://docker.pkg.github.com to ghcr.io.

3. Add your new {% data variables.product.prodname_container_registry %} authentication personal access token (PAT) as a GitHub ACtions secret. {% data variables.product.prodname_github_container_registry %} does not support using GITHUB_TOKEN for your PAT so you must use a different custom variable, such as CR_PAT. For more information, see "Creating and storing encrypted secrets."

4. In your {% data variables.product.prodname_actions %} workflow file, update the authentication PAT by replacing your Docker registry PAT ({% raw %}${{ secrets.GITHUB_TOKEN }}{% endraw %}) with a new variable for your {% data variables.product.prodname_container_registry %} PAT, such as {% raw %}${{ secrets.CR_PAT }}{% endraw %}.

Example of updated workflow

If part of your workflow accessed a Docker image hosted by the Docker registry like this:

{% raw %}

echo ${{ secrets.GITHUB_TOKEN }} | docker login https://docker.pkg.github.com -u $GITHUB_ACTOR --password-stdin
docker pull docker.pkg.github.com/github/octoshift/octoshift:latest
docker build . --tag docker.pkg.github.com/github/octoshift/octoshift:$GITHUB_SHA --cache-from docker.pkg.github.com/github/octoshift/octoshift:latest
docker push docker.pkg.github.com/github/octoshift/octoshift:$GITHUB_SHA

{% endraw %}

Then you'll need to update your workflow with the new {% data variables.product.prodname_container_registry %} URL and PAT like this:

{% raw %}

# new login with new container registry url and PAT
echo ${{ secrets.CR_PAT }} | docker login ghcr.io -u $GITHUB_ACTOR --password-stdin
# new container registry urls added
docker pull ghcr.io/github/octoshift:latest
docker build . --tag ghcr.io/github/octoshift:$GITHUB_SHA --cache-from ghcr.io/github/octoshift:latest
docker push ghcr.io/github/octoshift:$GITHUB_SHA

{% endraw %}