Practise real SRE, DevOps and infrastructure work, one decision at a time.
Each scenario puts you in a production situation with the evidence an engineer would have: metrics, logs, configuration and messages from the team. You decide what it means and what to do next, and get feedback on every answer.
Both use your Google account, and a free account opens three scenarios. To look first, open a sample scenario without an account.
How a scenario works
1
Read the situation
What was reported, what is running and what changed, with the metrics, logs or configuration that matter. In some scenarios you run the commands yourself in a terminal.
2
Make the calls
Single-choice, multi-select and written answers. Some scenarios reveal new evidence as you work through them.
3
Get feedback on each answer
Every answer is explained. Written answers are reviewed against what a strong response covers.
4
Track your confidence
Completing a scenario raises your confidence in the skill areas it covers.
SRE, DevOps and Infrastructure
156 scenarios across 15 skill areas, 11 to 20 minutes each. Two examples from each area:
SRE
Reliability under pressure: SLOs and error budgets, incident response, observability, capacity and production readiness.
Payments has used its whole error budget, and Product launches on Friday
Product wants to ship this week. Decide whether to freeze features, and make the case.
Advanced · 17 min
Legal needs engineering to confirm the availability Sales already promised
A customer contract promises 99.99% a month. Check it against measured availability before Legal sends it.
Intermediate · 15 min
DevOps
Getting changes to production and running them: CI/CD pipelines, containers and Kubernetes.
The pipeline passed, but the fix isn’t in production
A merged change is green in CI and missing in production. Work out what ran and what is deployed.
Intermediate · 18 min
UAT is running last week’s code, although the deploy succeeded
A green pipeline and a reported success, but testers see the old behaviour. Work out what is actually running, and why.
Intermediate · 13 min
Infrastructure
The layers underneath: infrastructure as code, Linux and networking.
“No space left on device”, with the disk 44% full
Writes fail on a server whose disk usage looks fine. Work out why, and keep the service running.
Beginner · 11 min
The ALB started returning 504 this afternoon
Checkout spins and fails behind the load balancer, with nothing deployed today. Trace the path and restore it safely.
Intermediate · 15 min
Progress by skill area
Your confidence is tracked in each of the 15 skill areas across SRE, DevOps and infrastructure. It rises as you complete scenarios, so you can see which areas need practice next.
Start free, then open the full library
A free account opens three showcase scenarios, one in each area: the situation and the first two decisions of each, with feedback on your answers.
Free account
SRE
Every dashboard is green, and customers say they cannot pay
DevOps
Deploys fail in 14 repositories on the same afternoon
Infrastructure
The production Terraform state has been locked since last night’s failed run
The SRE scenario is also open as a sample without an account.
Full library
Every decision in all 156 scenarios, with feedback on each answer, written answers reviewed, and terminal investigations where you run the commands yourself.
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- $25 a month · unlimited access, cancel anytime
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