devopsEASYBASH SCRIPTING
Warm up with compose Postgres readiness gate
Easy DevOps Basics arena: service dependencies, readiness checks, connection retries, and local developer reliability
XP reward
95
Coins
8
Target time
15m
Developers see random signup failures because the app starts before Postgres accepts connections. You are working inside a deployment operations lab, and the arena only clears when the result is safe, deterministic, and explainable.
Learning objective
Learn to apply service dependencies, readiness checks, connection retries, and local developer reliability in a deployment operations lab while explaining the invariant, safety constraints, and hidden edge cases.
Mission order
docker-compose.yml includes app, postgres, migrations, volumes, and environment variables. Implement the direct solution first, then document the one edge case that can break it. Submit the solution plus enough reasoning to pass hidden edge cases.Visible checks
uses safe command composition
Expected: deterministic command sequence
handles ordinary filenames
Expected: stable output
Clear requirements
- Demonstrates service dependencies, readiness checks, connection retries, and local developer reliability
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids unsafe dynamic execution
Secure validation contract
Judge type
BASH SCRIPTING
Complexity target
Linear scan over simulated files/log rows with deterministic output
Simulated lab
3 files/directories, allowed commands: awk, cat, cut, du, df, find, grep, head
Workspace
Terminal lab
Simulated secure terminalhost isolated
Test Results
Run the visible checks when your first pass is ready.
Clear Protocol
1Read the scenario and restate the expected output shape.
2Run visible checks before chasing hidden edge cases.
3Use Genie for one nudge if stuck, then explain the invariant.
4Submit only when the result is deterministic and safe.
Rewards
XP
95
Coins
8
Mission Route
Hints
Hints are metered and logged for No Hint Hero runs.
Genie Mentor Core
Hint protocol / contextual guardrails active
Progressive hints
Failed-test aware
Solution guarded
Mission: devops-easy-compose-postgres-readiness0 attempts0 failed tests0 hints used
Progressive hint depth
Genie: Genie online. I use your mission, attempts, failed tests, hints, and path context to coach the next rep without dumping answers first.