As a cluster administrator, you can expand the available node port range. If your cluster uses of a large number of node ports, you might need to increase the number of available ports.

The default port range is 30000-32767. You can never reduce the port range, even if you first expand it beyond the default range.

Prerequisites

  • Your cluster infrastructure must allow access to the ports that you specify within the expanded range. For example, if you expand the node port range to 30000-32900, the inclusive port range of 32768-32900 must be allowed by your firewall or packet filtering configuration.

Expanding the node port range

You can expand the node port range for the cluster.

Prerequisites
  • Install the OpenShift CLI (oc).

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

Procedure
  1. To expand the node port range, enter the following command. Replace <port> with the largest port number in the new range.

    $ oc patch network.config.openshift.io cluster --type=merge -p \
      '{
        "spec":
          { "serviceNodePortRange": "30000-<port>" }
      }'
    Example output
    network.config.openshift.io/cluster patched
  2. To confirm that the configuration is active, enter the following command. It can take several minutes for the update to apply.

    $ oc get configmaps -n openshift-kube-apiserver config \
      -o jsonpath="{.data['config\.yaml']}" | \
      grep -Eo '"service-node-port-range":["[[:digit:]]+-[[:digit:]]+"]'
    Example output
    "service-node-port-range":["30000-33000"]