How does Docker caching affect build times in CircleCI?

How does Docker caching affect build times in CircleCI?

Docker caching can significantly reduce build times in CircleCI by reusing layers from previous builds. When you cache layers, CircleCI doesn't need to rebuild them if they haven't changed, which speeds up the overall process.

Can you explain how to set up caching in CircleCI?

To set up caching in CircleCI, you can use the save_cache and restore_cache steps in your config file. This allows you to specify which directories or files to cache between builds.

What are the best practices for using Docker cache in CircleCI?

Best practices include using multi-stage builds to minimize image size, organizing your Dockerfile to maximize cache hits, and regularly cleaning up unused images to free up space.

Are there any limitations to Docker caching in CircleCI?

Yes, limitations include cache invalidation when dependencies change, and the cache size limit imposed by CircleCI, which can affect larger projects.