Write an OPA Rego policy to enforce that all Kubernetes Deployments have resource requests and limits set, and integrate it with Conftest in a CI pipeline
domain: www.openpolicyagent.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Write a Rego policy file with a deny rule that iterates over Deployment containers and checks that each container's resources.requests and resources.limits fields are non-empty
Use the 'input.spec.template.spec.containers' path for Deployment manifests and iterate using a comprehension to collect all violations with descriptive messages
Store the policy in a 'policy/' directory adjacent to your Kubernetes manifests and run 'conftest test --policy policy/ manifests/' to validate all YAML files
Add the conftest command to your CI pipeline as a required pre-merge step, using a pinned conftest container image for reproducibility
Test the policy locally with both compliant and non-compliant manifests to verify deny messages are accurate before enforcing in CI
Known gotchas
Conftest by default uses the 'main' package for deny and warn rules; policies in a different package are ignored unless explicitly referenced with the --namespace flag
The 'input' in conftest is the parsed YAML document, not wrapped in a Kubernetes API envelope; policies written for the Kubernetes admission API shape will not work as-is with conftest
Conftest exits non-zero only on 'deny' rule violations; 'warn' rule violations produce output but do not fail the pipeline unless the --fail-on-warn flag is set
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