KKP API provides several networking parameters that can be defined for each user cluster. These can be configured via KKP API endpoint for managing clusters:
/api/v2/projects/{project_id}/clusters/{cluster_id}
The networking parameters are configurable in spec.clusterNetwork. Some of them can be also configured via KKP UI on the Cluster configuration page, as shown below:
When no explicit value for a setting is provided, the default value is applied. The following table summarizes the parameters configurable via spec.clusterNetwork in the cluster API with their default values:
| Parameter | Default Value | Description |
|---|---|---|
pods.cidrBlocks | [172.25.0.0/16] ([172.26.0.0/16] for Kubevirt) | The network ranges from which POD networks are allocated. |
services.cidrBlocks | [10.240.16.0/20] ([10.241.0.0/20] for Kubevirt) | The network ranges from which service VIPs are allocated. |
proxyMode | ipvs | kube-proxy mode (ipvs/ iptables). |
dnsDomain | cluster.local | Domain name for k8s services. |
ipvs.strictArp | true for ipvs proxyMode, false otherwise | If enabled, configures arp_ignore and arp_announce kernel parameters to avoid answering ARP queries from kube-ipvs0 interface. |
nodeLocalDNSCacheEnabled | true | Enables NodeLocal DNS Cache feature. |
konnectivityEnabled | false | Enables Konnectivity service for control plane to node network communication. Requires KonnectivityService feature gate in the KubermaticConfiguration to be enabled. |