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Multi-stage hardened image

Containers · pro · live throwaway Linux box · 3 tiered hints

Author /home/player/Dockerfile as a multi-stage build: a `FROM golang:1.22 AS build` stage that compiles, and a minimal final stage that COPYs the binary `--from=build`, runs as a non-root USER, and declares a HEALTHCHECK.

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Fastest verified solves

• archsweep39s · ✦ no hints

How it works

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.

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FAQ

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.