Pre-provisioned Use Alternate Pod or Service Subnets

In Konvoy, the default pod subnet is 192.168.0.0/16, and the default service subnet is 10.96.0.0/12. If you wish to change the subnets you can do so with the following steps:

1. Generate the YAML manifests for the cluster using the --dry-run and -o yaml flags, along with the desired dkp cluster create command:

   dkp create cluster preprovisioned --cluster-name ${CLUSTER_NAME} --control-plane-endpoint-host <control plane endpoint host> --control-plane-endpoint-port <control plane endpoint port, if different than 6443> --dry-run -o yaml > cluster.yaml

   CODE

2. To modify the service subnet, add or edit the spec.clusterNetwork.services.cidrBlocks field of the Cluster object:

   kind: Cluster
   spec:
     clusterNetwork:
       services:
         cidrBlocks:
         - 10.0.0.0/18

   CODE

3. To modify the pod subnet, edit the Cluster and calico-cni ConfigMap resources:

   Cluster: Add or edit thespec.clusterNetwork.pods.cidrBlocks field:

   kind: Cluster
   spec:
     clusterNetwork:
       pods:
         cidrBlocks:
         - 172.16.0.0/16

   CODE

   ConfigMap: Edit the data."custom-resources.yaml".spec.calicoNetwork.ipPools.cidr field with your desired pod subnet:

   apiVersion: v1
   data:
     custom-resources.yaml: |
       apiVersion: operator.tigera.io/v1
       kind: Installation
       metadata:
         name: default
       spec:
         # Configures Calico networking.
         calicoNetwork:
           # Note: The ipPools section cannot be modified post-install.
           ipPools:
           - blockSize: 26
             cidr: 172.16.0.0/16
   kind: ConfigMap
   metadata:
     name: calico-cni-<cluter-name>

   CODE

When you provision the cluster, the configured pod and service subnets will be applied.