Red Hat build of MicroShift

NetworkPolicy CR and external IPs in OVN-Kubernetes

In OVN-Kubernetes, the NetworkPolicy custom resource (CR) enforces strict isolation rules. If a service is exposed using an external IP, a network policy can block access from other namespaces unless explicitly configured to allow traffic.

To allow access to external IPs across namespaces, create a NetworkPolicy CR that explicitly permits ingress from the required namespaces and ensures traffic is allowed to the designated service ports. Without allowing traffic to the required ports, access might still be restricted.

Example output

  apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    annotations:
    name: <policy_name>
    namespace: openshift-ingress
  spec:
    ingress:
    - ports:
      - port: 80
        protocol: TCP
    - ports:
      - port: 443
        protocol: TCP
    - from:
      - namespaceSelector:
          matchLabels:
          kubernetes.io/metadata.name: <my_namespace>
    podSelector: {}
    policyTypes:
    - Ingress

where:

<policy_name>: Specifies your name for the policy.
<my_namespace>: Specifies the name of the namespace where the policy is deployed.

For more details, see "About network policy".