9.7. Configuring multitenant isolation with network policy

Procedure

1. Create the following NetworkPolicy objects:

   1. A policy named allow-from-openshift-ingress.

      重要

      For the OVN-Kubernetes network provider plug-in, when the Ingress Controller is configured to use the HostNetwork endpoint publishing strategy, there is no supported way to apply network policy so that ingress traffic is allowed and all other traffic is denied.

      $ cat << EOF| oc create -f -
      apiVersion: networking.k8s.io/v1
      kind: NetworkPolicy
      metadata:
        name: allow-from-openshift-ingress
      spec:
        ingress:
        - from:
          - namespaceSelector:
              matchLabels:
                network.openshift.io/policy-group: ingress
        podSelector: {}
        policyTypes:
        - Ingress
      EOF

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   2. A policy named allow-from-openshift-monitoring:

      $ cat << EOF| oc create -f -
      apiVersion: networking.k8s.io/v1
      kind: NetworkPolicy
      metadata:
        name: allow-from-openshift-monitoring
      spec:
        ingress:
        - from:
          - namespaceSelector:
              matchLabels:
                network.openshift.io/policy-group: monitoring
        podSelector: {}
        policyTypes:
        - Ingress
      EOF

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   3. A policy named allow-same-namespace:

      $ cat << EOF| oc create -f -
      kind: NetworkPolicy
      apiVersion: networking.k8s.io/v1
      metadata:
        name: allow-same-namespace
      spec:
        podSelector:
        ingress:
        - from:
          - podSelector: {}
      EOF

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2. If the default Ingress Controller configuration has the spec.endpointPublishingStrategy: HostNetwork value set, you must apply a label to the default OpenShift Container Platform namespace to allow network traffic between the Ingress Controller and the project:

   1. Determine if your default Ingress Controller uses the HostNetwork endpoint publishing strategy:

      $ oc get --namespace openshift-ingress-operator ingresscontrollers/default \
        --output jsonpath='{.status.endpointPublishingStrategy.type}'

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   2. If the previous command reports the endpoint publishing strategy as HostNetwork, set a label on the default namespace:

      $ oc label namespace default 'network.openshift.io/policy-group=ingress'

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3. Confirm that the NetworkPolicy object exists in your current project by running the following command:

   $ oc get networkpolicy <policy-name> -o yaml

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   In the following example, the allow-from-openshift-ingress NetworkPolicy object is displayed:

   $ oc get -n project1 networkpolicy allow-from-openshift-ingress -o yaml

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   Example output

   apiVersion: networking.k8s.io/v1
   kind: NetworkPolicy
   metadata:
     name: allow-from-openshift-ingress
     namespace: project1
   spec:
     ingress:
     - from:
       - namespaceSelector:
           matchLabels:
             network.openshift.io/policy-group: ingress
     podSelector: {}
     policyTypes:
     - Ingress

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