OnCallReady: Get on-call ready

Learn Linux, systemd, networking, Docker, Terraform, Kubernetes and SRE by doing it in a real terminal - in your browser.

Who it is for

Developers moving to platform / SRE - You ship code; now you own the box it runs on. Learn what happens under the deploy button.
People preparing for on-call - Practice the 3am incidents - a full disk, an OOM loop, a node NotReady - before they page you.
CKA and Terraform exam candidates - Exam-style drills, timed practice and the gotchas the exams like to ask about.

Lessons in parts - Short parts of 5-10 minutes, plain words first, every command one click from the terminal.
A simulated Linux box - Real bash, real output, real error messages. What works here works on your own server.
Missions and incident drills - Fix a broken service, find who fills the disk, chase a 502. Labs check themselves; drills are different every round.
Spaced-repetition cards - FSRS schedules review cards from what you finished, so it sticks without cramming.
A phone app - Cards and reading on the phone, the terminal on the computer. Progress syncs between them.

No ads, no tracking. Only your study progress is stored, and only to sync it.

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