prefer-dual-stack-webhook

command module

v0.0.0-...-048efe5 Latest Latest Go to latest Published: Oct 10, 2021 License: Apache-2.0 Imports: 15 Imported by: 0

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Repository

github.com/tibordp/prefer-dual-stack-webhook

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README ¶

PreferDualStack Admission Controller

Currently Kubernetes services are created in single stack mode by default, defaulting to primary address family of the cluster.

This is a mutating webhook admission controller that adds ipFamilyPolicy: PreferDualStack to all newly created services if the field is not explicitely specified, making dual-stack the default.

Installation

kubectl apply -f https://raw.githubusercontent.com/tibordp/prefer-dual-stack-webhook/master/deploy.yaml

Demo

Before Afrer

> kubectl apply -f - <<EOF
apiVersion: v1
kind: Service
metadata:
  name: dummy
spec:
  selector:
    app: dummy
  ports:
    - port: 80
      targetPort: 80
EOF
service/dummy created

> kubectl describe svc dummy
Name:              dummy
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=dummy
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.96.200.4
IPs:               10.96.200.4
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         <none>
Session Affinity:  None
Events:            <none>

> kubectl apply -f - <<EOF
apiVersion: v1
kind: Service
metadata:
  name: dummy
spec:
  selector:
    app: dummy
  ports:
    - port: 80
      targetPort: 80
EOF
service/dummy created

> kubectl describe svc dummy
Name:              dummy
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=dummy
Type:              ClusterIP
IP Family Policy:  PreferDualStack
IP Families:       IPv4,IPv6
IP:                10.96.19.47
IPs:               10.96.19.47,fd00:10:96::f31
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         <none>
Session Affinity:  None
Events:            <none>

Acknowledgements

Admission controller webhook boilerplate adapted from douglasmakey/admissioncontroller by Douglas Makey Mendez Molero.

Documentation ¶

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Source Files ¶

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