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Chapter 5. Populating your private automation hub container registry

By default, private automation hub does not include container images. To populate your container registry, you must push a container image to it.

You must follow a specific workflow to populate your private automation hub container registry:

  • Pull images from the Red Hat Ecosystem Catalog (registry.redhat.io)
  • Tag them
  • Push them to your private automation hub container registry
Important

As of April 1st, 2025, quay.io is adding three additional endpoints. As a result, customers must adjust the allow/block lists within their firewall systems lists to include the following endpoints:

  • cdn04.quay.io
  • cdn05.quay.io
  • cdn06.quay.io

To avoid problems pulling container images, customers must allow outbound TCP connections (ports 80 and 443) to the following hostnames:

  • cdn.quay.io
  • cdn01.quay.io
  • cdn02.quay.io
  • cdn03.quay.io
  • cdn04.quay.io
  • cdn05.quay.io
  • cdn06.quay.io

This change should be made to any firewall configuration that specifically enables outbound connections to registry.redhat.io or registry.access.redhat.com.

Use the hostnames instead of IP addresses when configuring firewall rules.

After making this change, you can continue to pull images from registry.redhat.io or registry.access.redhat.com. You do not require a quay.io login, or need to interact with the quay.io registry directly in any way to continue pulling Red Hat container images.

For more information, see Firewall changes for container image pulls 2024/2025.

Ensure that the Network ports and protocols listed in Table 6.4. Execution Environments (EE) are available to avoid problems pulling container images.

5.1. Pulling images for use in automation hub

Before you can push container images to your private automation hub, you must first pull them from an existing registry and tag them for use. The following example details how to pull an image from the Red Hat Ecosystem Catalog (registry.redhat.io).

Prerequisites

  • You have permissions to pull images from registry.redhat.io.

Procedure

  1. Log in to Podman by using your registry.redhat.io credentials: 

    $ podman login registry.redhat.io
    Copy to Clipboard
  2. Enter your username and password.

  3. Pull a container image: 

    $ podman pull registry.redhat.io/<container_image_name>:<tag>
    Copy to Clipboard

Verification

To verify that the image you recently pulled is contained in the list, take these steps:

  1. List the images in local storage: 

    $ podman images
    Copy to Clipboard
  2. Check the image name, and verify that the tag is correct.

5.2. Tagging images for use in automation hub

After you pull images from a registry, tag them for use in your private automation hub container registry.

Prerequisites

  • You have pulled a container image from an external registry.
  • You have the FQDN or IP address of the automation hub instance.

Procedure

  • Tag a local image with the automation hub container repository: 

    $ podman tag registry.redhat.io/<container_image_name>:<tag> <automation_hub_hostname>/<container_image_name>
    Copy to Clipboard

Verification

  1. List the images in local storage: 

    $ podman images
    Copy to Clipboard
  2. Verify that the image you recently tagged with your automation hub information is contained in the list.

5.3. Pushing a container image to private automation hub

You can push tagged container images to private automation hub to create new containers and populate the container registry.

Prerequisites

  • You have permissions to create new containers.
  • You have the FQDN or IP address of the automation hub instance.

Procedure

  1. Log in to Podman using your automation hub location and credentials: 

    $ podman login -u=<username> -p=<password> <automation_hub_url>
    Copy to Clipboard

  2. Push your container image to your automation hub container registry: 

    $ podman push <automation_hub_url>/<container_image_name>
    Copy to Clipboard

Troubleshooting

The push operation re-compresses image layers during the upload, which is not guaranteed to be reproducible and is client-implementation dependent. This may lead to image-layer digest changes and a failed push operation, resulting in Error: Copying this image requires changing layer representation, which is not possible (image is signed or the destination specifies a digest).

Verification

  1. Log in to your automation hub.
  2. Navigate to Container Registry.
  3. Locate the container in the container repository list.
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