opa-image-security-templates

You can enforce Kubernetes image security policies using OPA by applying templates that restrict registries, require digest references, and validate image signatures. This automates policy-as-code across CI/CD pipelines and runtime admission controls.

To block untrusted registries in Kubernetes, apply a registry allowlist policy template. This restricts deployments to only corporate registries and blocks public or untrusted sources from being pulled.

Yes, Cosign is required to enforce cryptographic image signatures. The OPA templates use Cosign to validate signatures and optional Rekor attestations for securing your Kubernetes deployments.

The best way to prevent tag mutation is enforcing digest-based image references. OPA templates require immutable digest references instead of mutable tags to ensure deployed images remain unchanged.

Yes, this OPA policy-as-code approach works with Trivy and crane. These dependencies are utilized alongside kubectl and Cosign to perform vulnerability checks, signature verification, and image analysis.

Yes, you can apply these OPA image security templates across both CI/CD pipelines and runtime admission controls. This ensures consistent enforcement of registry allowlists, digests, and signatures throughout the deployment lifecycle.