Caching Docker images to reduce the number of calls to Docker Hub from your CI/CD infrastructure

Docker announced changes to its subscription model, introducing rate limits for container image pulls effective November 1, 2020, which restrict anonymous users to 100 pull requests per six hours and authenticated users to 200. This has prompted the DevOps community, including GitLab users, to seek guidance on adapting their CI/CD workflows. One recommended solution is using a registry mirror, which allows images to be cached locally after the initial pull from Docker Hub, thereby reducing the number of pulls directly from Docker Hub. GitLab has implemented Google's Docker Hub images mirror for GitLab.com Shared Runner users, ensuring their CI jobs remain unaffected. For self-hosted GitLab Runners, users can either utilize existing Registry Mirrors from their cloud providers or set up their own. The text provides detailed instructions on setting up a Docker registry mirror and configuring Docker to use it, along with alternative authentication methods to mitigate rate limit impacts, emphasizing the need to choose solutions best suited to organizational needs.

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