When installing Gatekeeper, you must either edit the Gatekeeper controller manager deployment or the service with the appropriate annotations for Prometheus scraping: Open Policy Agent also exposes a metrics endpoint when running as a server, but since Gatekeeper embeds OPA and we don’t run it as a server, we won’t be using it. Gatekeeper exposes a Prometheus metrics endpoint to provide metrics for monitoring service health and performance. Scraping Prometheus metrics from Gatekeeper If you want to learn more about Gatekeeper, check out this Kubernetes blog or the project page. The audit functionality periodically evaluates objects against the constraints, detecting pre-existing configurations.Each template describes the Rego evaluation logic and the schema for the constraint, including the CRD and the parameters passed into the constraint. A constraint template is required to declare a constraint.These are written in Rego, OPA’s declarative policy language. A constraint or policy instance is a declaration of the desired object definition.The API server will respond based on the policy executed by OPA inside Gatekeeper. The Kubernetes API server will trigger the Gatekeeper admission webhook to process the request (whenever an object is created, updated or deleted).
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We won’t get into the details of how Gatekeeper works, but a few key concepts you need to know in order to understand how to monitor Gatekeeper can be seen in the following request workflow: This allows you to compare objects in your Kubernetes against one another, create constraints (stored in CRD), and audit against them or create constraint templates to reuse things. Gatekeeper embeds OPA constraint framework for policy evaluation. Gatekeeper is a subproject of OPA that provides a customizable Kubernetes admission controller to audit and enforce policies such as what users can do in Kubernetes (at a more fine-grained level than RBAC), and ensure clusters are compliant with organization policies. OPA Gatekeeper, a Kubernetes admission controller If you are looking at how to allow or deny scheduling pods based on image scanning results, check out our blog, performing image scanning on Admission Controller with OPA. OPA has integrations with many cloud-native projects, including Kubernetes and Istio, or Sysdig.
It uses a declarative language known as Rego and can be used to answer the following: Open Policy Agent, OPA in short, is a general purpose policy engine. Click to tweet What is Open Policy Agent?
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