The design and implementation of cyber-dojo
summary
cyber-dojo is a browser coding dojo that runs user code on the server inside Docker images and later moves the Rails app itself into a Docker image, effectively using docker-in-docker to isolate executions. sessions generate a hex id and anonymous avatars so reviews view per-animal diffs without names (anonymous animals). the server classifies runs as green/amber/red/gray with a 10 second timeout, has ~8,888 commits, ~50,000 practice sessions, CI that builds images and runs tests inside containers, and is free for non-commercial use.
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