How do I enforce policy-as-code for Cluster lifecycle using OPA and Conftest?

Enforcing policy-as-code for cluster lifecycle management using Open Policy Agent (OPA) and Conftest helps ensure that your Kubernetes resources are aligned with best practices and organizational policies. This approach allows developers and operators to define, test, and enforce compliance rules in a systematic way, reducing errors and improving security and performance across the cluster. Below is a practical example of how to implement this.

# Sample rego policy for validating Kubernetes resources package kubernetes.admission # Validate names of resources validate_name[resource] { resource := input # Ensure resource name starts with a letter and contains only lowercase alphanumeric characters and hyphens name := resource.metadata.name regex.match("^([a-z])([a-z0-9-]*)$", name) } # Main rule: all resources must pass the name validation allow { some resource validate_name[resource] }

policy-as-code OPA Conftest Kubernetes cluster lifecycle compliance best practices

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