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Configure a mirror registry

· 2 min read
Shipra Singh
Shipra Singh
Tech writer

Lower rate limits imposed on the Docker Hub End-User License Agreement (EULA) made it difficult for community members to access the docker.io images frequently. A simple solution to this problem is to configure a mirror for the docker.io registry in the registries.conf file. This way, they can access the Docker resources whenever needed.

With the Podman Desktop UI, you can add registry locations and configure their mirrors easily. Configuring a mirror redirects a registry to another location, enabling you to use its content. For example, if you have configured ghcr.io as a mirror for docker.io and try to pull a resource, Podman pulls the resource from ghcr.io instead of docker.io.

The blog covers how to configure a mirror for the docker.io registry.

Prerequisites​

  • Upgrade to the latest version of Podman.
  • Recreate your Podman machine. Otherwise, you get a notification when you set up your registry configuration: notification to mount the registry file

Configuring: A mirror for docker.io​

  1. Go to the Settings > Resources page.
  2. Select More Options > Setup registry configuration in the Podman tile. A command palette opens. Set up registry configuration
  3. Set up your registry configuration:
  4. Select the Add registry configuration option from the command palette. adding registry configuration
  5. Type the location of the registry, such as docker.io, and press the Enter key. The docker.io registry is added to the palette. docker.io registry added
  6. Select docker.io from the command palette.
  7. Type the location where you want to mirror the registry, such as ghcr.io, and press the Enter key. The entry for the docker.io registry shows the location where it is mirrored. mirrored registry location
  8. Select the End configuring registries option to end registry configuration. ending registry configuration

Verifying: the mirror​

There is no direct way to verify the mirror configuration from the UI. But, you can use the CLI for verification.

  1. Start an interactive session with the default Podman machine:
$ podman machine ssh <machine_name>
  1. Pull an invalid image from docker.io.
$ podman pull docker.io/invalid

An error message appears in the terminal indicating a failure to pull the image from the mirror. You receive the error message: Mirrors have also failed.