How to cache an already built docker image?

[halfer]

I made some notes on that in this blog post:

Notes on caching Docker layers in CircleCI

I’ve been playing with Docker layer caching on the free tier, and have written up some strategies I tried. There is an out-of-the-box cache device in CircleCI available to paid users, for an extra fee, but with a bit of extra work, anyone can have access to faster builds. My article is fairly discursive, since the kind of caching that is preferred will vary from one project/team to another. Long story short, it is my opinion that using an external registry was more effective than using the Circ…