Design a Docker Image Pull-Through Cache · System Design Interview

Design a Docker Image Pull-Through CacheDesign a registry mirror that sits between a company's build and deploy machines and a public registry, so images are pulled from the outside once and from the mirror after that.What it has to do

Serve an image layer from the mirror when it has it

Fetch from the upstream registry and keep a copy when it does not

Never serve a layer whose content does not match its digest

Scale

Pulls per day: 2 million

Distinct layers: 5 million

Out of scope

Pushing private images

Vulnerability scanning

Authentication to the upstream registry

Garbage collection policy in detail

Practise this challengeAll system design challenges

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