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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.
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
...
- 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.externalIPfield 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
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.autoAssignCIDRssetapiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: ... externalIP: autoAssignCIDRs: - 192.168.132.254/29The following YAML configures policy rules for the allowed and rejected CIDR ranges:
Example configuration with
spec.externalIP.policysetapiVersion: 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
