Set up a local Docker registry mirror

This article introduces how to use a self-hosted Docker registry to mirror images to a local server, thereby resolving network access issues and improving pull speeds. The core content covers the implementation of an automated mirroring script. This script handles the retry mechanism using an exponential backoff algorithm and supports batch synchronization of numerous Docker images, including databases, programming language runtimes, and various applications. The article details two deployment methods: first, installing Python dependencies directly on a Linux host and executing the script; second, building a Docker container that includes cron scheduled tasks to achieve daily automatic synchronization. Finally, the guide provides specific steps for configuring the Docker daemon to trust a local insecure registry, demonstrating how to pull and push images from the local registry. This solution provides an efficient and stable private image source for users who require offline environments or need to optimize image distribution efficiency, effectively reducing reliance on external network services.