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Chapter 17. Configuring hybrid networking


As a cluster administrator, you can configure the Red Hat OpenShift Networking OVN-Kubernetes network plugin to allow Linux and Windows nodes to host Linux and Windows workloads, respectively.

17.1. Configuring hybrid networking with OVN-Kubernetes

You can configure your cluster to use hybrid networking with the OVN-Kubernetes network plugin. This allows a hybrid cluster that supports different node networking configurations.

Note

This configuration is necessary to run both Linux and Windows nodes in the same cluster.

Prerequisites

  • Install the OpenShift CLI (oc).
  • Log in to the cluster as a user with cluster-admin privileges.
  • Ensure that the cluster uses the OVN-Kubernetes network plugin.

Procedure

  1. To configure the OVN-Kubernetes hybrid network overlay, enter the following command:

    $ oc patch networks.operator.openshift.io cluster --type=merge \
      -p '{
        "spec":{
          "defaultNetwork":{
            "ovnKubernetesConfig":{
              "hybridOverlayConfig":{
                "hybridClusterNetwork":[
                  {
                    "cidr": "<cidr>",
                    "hostPrefix": <prefix>
                  }
                ],
                "hybridOverlayVXLANPort": <overlay_port>
              }
            }
          }
        }
      }'
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    where:

    cidr
    Specify the CIDR configuration used for nodes on the additional overlay network. This CIDR must not overlap with the cluster network CIDR.
    hostPrefix
    Specifies the subnet prefix length to assign to each individual node. For example, if hostPrefix is set to 23, then each node is assigned a /23 subnet out of the given cidr, which allows for 510 (2^(32 - 23) - 2) pod IP addresses. If you are required to provide access to nodes from an external network, configure load balancers and routers to manage the traffic.
    hybridOverlayVXLANPort
    Specify a custom VXLAN port for the additional overlay network. This is required for running Windows nodes in a cluster installed on vSphere, and must not be configured for any other cloud provider. The custom port can be any open port excluding the default 4789 port. For more information on this requirement, see the Microsoft documentation on Pod-to-pod connectivity between hosts is broken.

    Example output

    network.operator.openshift.io/cluster patched
    Copy to Clipboard Toggle word wrap

  2. To confirm that the configuration is active, enter the following command. It can take several minutes for the update to apply.

    $ oc get network.operator.openshift.io -o jsonpath="{.items[0].spec.defaultNetwork.ovnKubernetesConfig}"
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