Linux Practice on Real Systems

Practice Linux two ways here. Warm up in the free in-browser terminal, then do the real thing: fix broken Linux and ops systems in a live cloud workspace - permissions, services, networking, logs - the skills the job runs on.

Commands are the start, not the goal

Knowing commands is table stakes. The job is using them to diagnose a real problem - a service that will not start, a full disk, a permission that is wrong. That is what these practice on.

14 challenges to practice

Fix the Nginx 502 Bad GatewayDevOps · Junior Recover a Crashed Linux ServiceDevOps · Junior Correct a Postgres Port MismatchDevOps · Junior Reopen the Redis Bind Address (Connection Refused)DevOps · Junior Resolve an Nginx 403 Forbidden (Permissions)DevOps · Junior Fix a Docker Container That Exits ImmediatelyDevOps · Junior Write a Production-Ready DockerfileDevOps · Junior Repair a Failing GitHub Actions WorkflowDevOps · Junior Shrink a Bloated Docker Image (Multi-Stage Build)DevOps · Junior Patch a Critical CVE Flagged by TrivyDevOps · Junior Write a Production systemd Service UnitDevOps · Junior Get a Terraform Plan to PassDevOps · Junior Provision an AWS S3 Bucket With TerraformDevOps · Junior Lock Down an Over-Permissive AWS IAM PolicyDevOps · Junior

Where to begin

Try the free <a href="/tools/online-linux-terminal">online Linux terminal</a> to get comfortable, then pick a junior DevOps system to fix for real. Each fix lands on a portfolio. Work through a few across the common failure modes - a dead service, a wrong permission, a full disk, a misconfigured network - and you build both the reflexes and the concrete stories that Linux and DevOps interviews actually probe for.

Build your portfolio free. You are in a real cloud workspace in 30 seconds - fix real systems, show real work.

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