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Enforcing Kubernetes Probes with a Custom Admission Webhook
- Container health checks via liveness and readiness probes are essential for Kubernetes workloads to ensure resilience and prevent production issues.
- A custom Kubernetes Admission Controller is discussed in this post to enforce the presence of liveness and readiness probes on all pods.
- Enforcing probes ensures better resilience, standardization of practices, and automation of policy enforcement at the cluster level.
- The Admission Controller checks for required probes (liveness, readiness) on every container and rejects pod creations lacking any configured probe.
- A demo showcases how pods with missing probes are blocked in default namespaces but allowed in excluded namespaces like kube-system.
- Pre-requisites for installation include a Kubernetes cluster with cert-manager installed and applying the provided manifests for the admission controller.
- The implementation logic involves checking and validating probes for containers in incoming pod create/update requests, responding with approval or rejection accordingly.
- Documentation references on Kubernetes Admission Controllers and extensible admission controllers are provided for further understanding.
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