Learn OPA-REGO with Real Code Examples

Download and install OPA binary or run as container

Load policy files (.rego) into OPA

Configure data input sources (JSON, Kubernetes, API payloads)

Expose OPA via REST API or integrate with application SDKs

Test policy evaluation with `opa eval` or via REST endpoints

Install OPA binary or container image

Load policies and input data

Expose OPA via REST API or SDK

Integrate with Kubernetes or services

Test evaluation and audit logging

policy.rego - policy definitions

data.json - input context for policies

bundle.yaml - policy bundles

opa.conf - OPA server configuration

Gatekeeper Constraint templates and resources

opa eval --data policy.rego 'data.example.allow'

opa test ./policy

opa run

opa check policy.rego

opa fmt policy.rego

Supports UTF-8 in JSON inputs and logs

Policy evaluation is language-agnostic

Decision logs can be exported globally

Compatible with multi-region deployments

No native localization in CLI, but integrations possible

REST API endpoints for policy queries

CLI interface for local evaluation

SDKs for Go, Python, Java

Kubernetes-native Gatekeeper integration

Auditing outputs for multi-team visibility

OPA has no native GUI; CLI is primary interface

Optional dashboards via integrations

Decision logs can be visualized

Gatekeeper has Kubernetes-native resource visualization

Monitoring via Prometheus/Grafana

Policy versions and bundles

Decision logs for auditing

Active evaluation state in memory

Kubernetes constraints and templates

Input data tracking for consistent decisions

JSON input documents

Policy bundles (Rego + data)

Audit logs

Kubernetes cluster resources

CI/CD pipeline events for evaluation