Containers · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /home/player/docker-compose.yml: web depends_on db with condition service_healthy; db (postgres:16) has a healthcheck. (Authored config, graded structurally — the engine isn't run here.)
▶ Start this challengeNobody has solved this one yet — be the first clear on the leaderboard.
Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.
Author Dockerfiles and Compose files; build and run container workloads.
See all Containers challenges →
Is it free? Yes — play as a guest, no signup required to start.
Do I need to install anything? No. Everything runs in your browser.
How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.