Set up a Docker Registry as a pull-through cache on Raspberry Pi

If you have a slow internet connection and multiple users downloading
Docker images, then why not use it as a cache on a Raspberry Pi? This can save
you time and bandwidth when using Docker. Raspberry Pi is amazing, because it
is portable, cheap, and consumes negligible power. By creating the solution
described in this tutorial, every time you download an image, it will be
cached on the Pi; then, for all subsequent requests, the same image will be
delivered from the local cache.


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