Harden compose Postgres readiness gate
Hard DevOps Basics arena: service dependencies, readiness checks, connection retries, and local developer reliability
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Missing prerequisites: devops-easy-compose-postgres-readiness
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.
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.
- 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
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