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Namespace allowance Validating Admission WebHook

This is a Kubernetes Validating Admission WebHook that checks if a namespace resource is allowed to create pods on nodes that have special roles.

This is based on Kelsey Hightower's denyenv validating admission webhook

Getting started

In order to customize which namespaces are allowed to deploy on specifically labeled nodes change namespaces_allowed and restricted_node_roles in index.js file.

Build docker container:

docker build --rm -f "Dockerfile" -t namespace-allowance-admission-webhook:latest .

Change ${URL} and ${CA_BUNDLE_BASE64} in namespace-validator.yaml file:

  • ${URL} should point to newly build validating admission webhook. HTTPS protocol is mandatory.
  • ${CA_BUNDLE_BASE64} should be the CA of admission webhook's webserver encoded with base64

Apply namespace-validator.yaml manifest:

kubectl apply -f namespace-validator.yaml

TBD

How to test.