Containers · easy · live throwaway Linux box · 3 tiered hints
Author /home/player/Dockerfile for a Python app: base image python:3.12-slim, working dir /app, copy the source in, install from requirements.txt, and run `python app.py` as the default command.
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Press start and you get your own real, disposable Linux VM — in the browser terminal or over SSH. Work the task on a live system; tmpfs.tech grades your solution automatically against the actual machine state, then throws the box away. No install, free to try as a guest.
Author Dockerfiles and Compose files; build and run container workloads.
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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, or connect over SSH if you prefer your own terminal.
How is it graded? Automatically and deterministically — your work is checked against the real state of the machine you worked on.