What you will learn
- Validate and lint
- Write policy with OPA/Sentinel
- Test modules
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The basics, in plain English
Just like app code, infrastructure code can be tested and governed. Policy as Code lets you write automatic rules, like “no storage bucket may be public”, that block bad infrastructure before it is created.
- Policy
- A rule your infrastructure must follow, like “never open this to the public”.
- Policy as Code
- Writing those rules as code so they are checked automatically every time.
- Validation
- Checking config for mistakes before it is applied.
- Guardrail
- An automatic limit that stops risky changes without blocking safe ones.
- Why test infra
- A bad infrastructure change can cause outages or security holes, so catch them early.
01
Guardrails
fmt and validate catch basics. Policy-as-code (OPA, Sentinel) enforces rules like no public buckets. terraform test validates modules.
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