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Block Services with type LoadBalancer

Description​

Disallows all Services with type LoadBalancer. https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer

Template​

apiVersion: templates.gatekeeper.sh/v1
kind: ConstraintTemplate
metadata:
  name: k8sblockloadbalancer
  annotations:
    metadata.gatekeeper.sh/title: "Block Services with type LoadBalancer"
    metadata.gatekeeper.sh/version: 1.0.0
    description: >-
      Disallows all Services with type LoadBalancer.

      https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer
spec:
  crd:
    spec:
      names:
        kind: K8sBlockLoadBalancer
  targets:
    - target: admission.k8s.gatekeeper.sh
      rego: |
        package k8sblockloadbalancer

        violation[{"msg": msg}] {
          input.review.kind.kind == "Service"
          input.review.object.spec.type == "LoadBalancer"
          msg := "User is not allowed to create service of type LoadBalancer"
        }

Usage​

kubectl apply -f https://raw.githubusercontent.com/open-policy-agent/gatekeeper-library/master/library/general/block-loadbalancer-services/template.yaml

Examples​

block-loadbalancer-services
constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockLoadBalancer
metadata:
  name: block-load-balancer
spec:
  match:
    kinds:
      - apiGroups: [""]
        kinds: ["Service"]

Usage

kubectl apply -f https://raw.githubusercontent.com/open-policy-agent/gatekeeper-library/master/library/general/block-loadbalancer-services/samples/block-load-balancer/constraint.yaml
example-allowed
apiVersion: v1
kind: Service
metadata:
  name: my-service-allowed
spec:
  type: ClusterIP
  ports:
    - port: 80
      targetPort: 80

Usage

kubectl apply -f https://raw.githubusercontent.com/open-policy-agent/gatekeeper-library/master/library/general/block-loadbalancer-services/samples/block-load-balancer/example_allowed.yaml
example-disallowed
apiVersion: v1
kind: Service
metadata:
  name: my-service-disallowed
spec:
  type: LoadBalancer
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30007

Usage

kubectl apply -f https://raw.githubusercontent.com/open-policy-agent/gatekeeper-library/master/library/general/block-loadbalancer-services/samples/block-load-balancer/example_disallowed.yaml