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Chapter 13. ExternalIP address block configuration

The configuration for ExternalIP address blocks is defined by a Network custom resource (CR) named cluster. The Network CR is part of the config.openshift.io API group.

Important

During cluster installation, the Cluster Version Operator (CVO) automatically creates a Network CR named cluster. Creating any other CR objects of this type is not supported.

The following YAML describes the ExternalIP configuration:

Network.config.openshift.io CR named cluster

apiVersion: config.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  externalIP:
    autoAssignCIDRs: []
1 

    policy:
2 

      ...
Copy to Clipboard Toggle word wrap

1
Defines the IP address block in CIDR format that is available for automatic assignment of external IP addresses to a Service. Only a single IP address range is allowed.
2
Defines restrictions on manual assignment of an IP address to a Service. If no restrictions are defined, specifying the spec.externalIP field in a Service is not allowed. By default, no restrictions are defined.

The following YAML describes the fields for the policy stanza:

Network.config.openshift.io policy stanza

policy:
  allowedCIDRs: []
1 

  rejectedCIDRs: []
2
Copy to Clipboard Toggle word wrap

1
A list of allowed IP address ranges in CIDR format.
2
A list of rejected IP address ranges in CIDR format.

Example external IP configurations

Several possible configurations for external IP address pools are displayed in the following examples:

  • The following YAML describes a configuration that enables automatically assigned external IP addresses:

    Example configuration with spec.externalIP.autoAssignCIDRs set

    apiVersion: config.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  ...
  externalIP:
    autoAssignCIDRs:
    - 192.168.132.254/29
    Copy to Clipboard Toggle word wrap

  • The following YAML configures policy rules for the allowed and rejected CIDR ranges:

    Example configuration with spec.externalIP.policy set

    apiVersion: config.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  ...
  externalIP:
    policy:
      allowedCIDRs:
      - 192.168.132.0/29
      - 192.168.132.8/29
      rejectedCIDRs:
      - 192.168.132.7/32
    Copy to Clipboard Toggle word wrap

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