This is a cache of https://docs.openshift.com/container-platform/4.8/networking/multiple_networks/configuring-multi-network-policy.html. It is a snapshot of the page at 2024-11-22T20:09:31.053+0000.
Configuring multi-network policy - Multiple networks | Networking | OpenShift Container Platform 4.8
    OpenShift docs are moving and will soon only be available at docs.redhat.com, the home of all Red Hat product documentation. Explore the new docs experience today.
  1. Documentation
    2. history
×

Configuring multi-network policy

As a cluster administrator, you can configure network policy for additional networks.

You can specify multi-network policy for only macvlan additional networks. Other types of additional networks, such as ipvlan, are not supported.

Differences between multi-network policy and network policy

Although the MultiNetworkPolicy API implements the NetworkPolicy API, there are several important differences:

  • You must use the MultiNetworkPolicy API:

    apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy

  • You must use the multi-networkpolicy resource name when using the CLI to interact with multi-network policies. For example, you can view a multi-network policy object with the oc get multi-networkpolicy <name> command where <name> is the name of a multi-network policy.

  • You must specify an annotation with the name of the network attachment definition that defines the macvlan additional network:

    apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>

    where:

    <network_name>

    Specifies the name of a network attachment definition.

Enabling multi-network policy for the cluster

As a cluster administrator, you can enable multi-network policy support on your cluster.

Prerequisites

  • Install the OpenShift CLI (oc).

  • Log in to the cluster with a user with cluster-admin privileges.

Procedure

  1. Create the multinetwork-enable-patch.yaml file with the following YAML:

    apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  useMultiNetworkPolicy: true

  2. Configure the cluster to enable multi-network policy:

    $ oc patch network.operator.openshift.io cluster --type=merge --patch-file=multinetwork-enable-patch.yaml
    Example output
    network.operator.openshift.io/cluster patched

Working with multi-network policy

As a cluster administrator, you can create, edit, view, and delete multi-network policies.

Prerequisites

  • You have enabled multi-network policy support for your cluster.

Creating a multi-network policy

To define granular rules describing ingress or egress network traffic allowed for namespaces in your cluster, you can create a multi-network policy.

Prerequisites

  • Your cluster uses a cluster network provider that supports NetworkPolicy objects, such as the OVN-Kubernetes network provider or the OpenShift SDN network provider with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.

  • You installed the OpenShift CLI (oc).

  • You are logged in to the cluster with a user with cluster-admin privileges.

  • You are working in the namespace that the multi-network policy applies to.

Procedure

  1. Create a policy rule:

    1. Create a <policy_name>.yaml file:

      $ touch <policy_name>.yaml

      where:

      <policy_name>

      Specifies the multi-network policy file name.

    2. Define a multi-network policy in the file that you just created, such as in the following examples:

      Deny ingress from all pods in all namespaces
      apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: deny-by-default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress: []

      where

      <network_name>

      Specifies the name of a network attachment definition.

      Allow ingress from all pods in the same namespace
      apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-same-namespace
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}

      where

      <network_name>

      Specifies the name of a network attachment definition.

  2. To create the multi-network policy object, enter the following command:

    $ oc apply -f <policy_name>.yaml -n <namespace>

    where:

    <policy_name>

    Specifies the multi-network policy file name.

    <namespace>

    Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

    Example output
    multinetworkpolicy.k8s.cni.cncf.io/default-deny created

Editing a multi-network policy

You can edit a multi-network policy in a namespace.

Prerequisites

  • Your cluster uses a cluster network provider that supports NetworkPolicy objects, such as the OVN-Kubernetes network provider or the OpenShift SDN network provider with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.

  • You installed the OpenShift CLI (oc).

  • You are logged in to the cluster with a user with cluster-admin privileges.

  • You are working in the namespace where the multi-network policy exists.

Procedure

  1. Optional: To list the multi-network policy objects in a namespace, enter the following command:

    $ oc get multi-networkpolicy

    where:

    <namespace>

    Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

  2. Edit the multi-network policy object.

    • If you saved the multi-network policy definition in a file, edit the file and make any necessary changes, and then enter the following command.

      $ oc apply -n <namespace> -f <policy_file>.yaml

      where:

      <namespace>

      Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

      <policy_file>

      Specifies the name of the file containing the network policy.

    • If you need to update the multi-network policy object directly, enter the following command:

      $ oc edit multi-networkpolicy <policy_name> -n <namespace>

      where:

      <policy_name>

      Specifies the name of the network policy.

      <namespace>

      Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

  3. Confirm that the multi-network policy object is updated.

    $ oc describe multi-networkpolicy <policy_name> -n <namespace>

    where:

    <policy_name>

    Specifies the name of the multi-network policy.

    <namespace>

    Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

Viewing multi-network policies

You can examine the multi-network policies in a namespace.

Prerequisites

  • You installed the OpenShift CLI (oc).

  • You are logged in to the cluster with a user with cluster-admin privileges.

  • You are working in the namespace where the multi-network policy exists.

Procedure

  • List multi-network policies in a namespace:

    • To view multi-network policy objects defined in a namespace, enter the following command:

      $ oc get multi-networkpolicy

    • Optional: To examine a specific multi-network policy, enter the following command:

      $ oc describe multi-networkpolicy <policy_name> -n <namespace>

      where:

      <policy_name>

      Specifies the name of the multi-network policy to inspect.

      <namespace>

      Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

Deleting a multi-network policy

You can delete a multi-network policy in a namespace.

Prerequisites

  • Your cluster uses a cluster network provider that supports NetworkPolicy objects, such as the OVN-Kubernetes network provider or the OpenShift SDN network provider with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.

  • You installed the OpenShift CLI (oc).

  • You are logged in to the cluster with a user with cluster-admin privileges.

  • You are working in the namespace where the multi-network policy exists.

Procedure

  • To delete a multi-network policy object, enter the following command:

    $ oc delete multi-networkpolicy <policy_name> -n <namespace>

    where:

    <policy_name>

    Specifies the name of the multi-network policy.

    <namespace>

    Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

    Example output
    multinetworkpolicy.k8s.cni.cncf.io/default-deny deleted

Additional resources