Practice real infra debugging.
Hands-on Docker scenarios in a fully simulated terminal — type real commands, watch real output, and learn how production breaks. New tracks every few weeks.
Pick a track.
Each track is a graph of connected problems. Solve in any order — or follow the paved path.
Docker fundamentals
Containers, images, networks, volumes.
Kubernetes incidents
Crashloops, failed probes, scaling pain.
Linux deep-dive
Processes, signals, FDs, cgroups.
On-call scenarios
3am-style incidents. 20 minutes.
Networking
DNS, routing, NAT, iptables.
Observability
Metrics, traces, logs.
Built so you actually learn.
A simulated terminal that responds like the real thing — so you can break, fix, and try again without spinning up cloud bills.
Realistic terminal
Type commands and read output the way you would on a real box. No multiple-choice quizzes.
Feedback that teaches
Submit when you're ready. Get a clear breakdown of what you nailed and what to revisit.
Hints when you're stuck
Tiered nudges so you don't get blocked. Use them when you need them, ignore them when you don't.