Service Internal Traffic Policy
Kubernetes v1.26 [stable]
Service Internal Traffic Policy enables internal traffic restrictions to only route internal traffic to endpoints within the node the traffic originated from. The "internal" traffic here refers to traffic originated from Pods in the current cluster. This can help to reduce costs and improve performance.
Using Service Internal Traffic Policy
You can enable the internal-only traffic policy for a
Service, by setting its
Local. This tells kube-proxy to only use node local
endpoints for cluster internal traffic.
The following example shows what a Service looks like when you set
apiVersion: v1 kind: Service metadata: name: my-service spec: selector: app.kubernetes.io/name: MyApp ports: - protocol: TCP port: 80 targetPort: 9376 internalTrafficPolicy: Local
How it works
The kube-proxy filters the endpoints it routes to based on the
spec.internalTrafficPolicy setting. When it's set to
Local, only node local
endpoints are considered. When it's
Cluster (the default), or is not set,
Kubernetes considers all endpoints.