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setup-hybrid-OVNKubernetes-cluster.md

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Setup hybrid OVNKubernetes cluster

This guide assumes the user has installed current versions of the OpenShift installer (openshift-install) and client (oc) binaries. Please refer to the official OpenShift Container Platform documentation for details.

Create install-config

Run the following command and follow the instructions:

$ openshift-install create install-config --dir=<cluster_directory>

This results in an install-config.yaml file in <cluster_directory>. Edit the install-config.yaml to switch networkType from OpenShiftSDN to OVNKubernetes:

$ sed -i 's/OpenShiftSDN/OVNKubernetes/g' <cluster_directory>/install-config.yaml

Create manifests

Now generate the manifests for the previously created install-config:

$ openshift-install create manifests --dir=<cluster_directory>

This creates a manifests and openshift folder in your <cluster_directory>. Now create a <cluster_directory>/manifests/cluster-network-03-config.yml file with the following contents:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      hybridOverlayConfig:
        hybridClusterNetwork:
        - cidr: 10.132.0.0/14
          hostPrefix: 23

The above configuration is recommended for AWS and Azure clusters.

vSphere

For vSphere clusters, you must add the hybridOverlayVXLANPort option to work around the pod-to-pod connectivity between hosts issue:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      hybridOverlayConfig:
        hybridClusterNetwork:
          - cidr: 10.132.0.0/14
            hostPrefix: 23
        hybridOverlayVXLANPort: 9898

Attention

  • The hybridClusterNetwork CIDR cannot overlap with the clusterNetwork CIDR
  • You cannot use Windows Server 2019 LTSC (1809) as it does not have the kernel feature required for using custom VXLAN ports

Create cluster

Now proceed to cluster creation:

$ openshift-install create cluster --dir=<cluster_directory>

Wait until cluster creation has succeeded and login credentials are shown.