Retrieve the CIDR Values from the Cluster

You must update the SPKInfrastructure CR with correct CIDR values as configured in your environment configurations.

Note: User can provide any name to the cidrList.name and ipPoolList.name.

In the bellow example,

  • xx_cidr_ipv4 is the IPv4 network/subnet mentioned in the internal VLAN CR, see F5SPKVLAN.
  • xx_cidr_ipv6 is the IPv6 network/subnet mentioned in the internal VLAN CR, see F5SPKVLAN.
egress:
  json:
    ipPoolCidrInfo:
      cidrList:
        - name: vlan_cidr_ipv4
          value: "<IPv4 network/subnet>"
        - name: vlan_ipv6_cidr
          value: "<IPv6 network/subnet>"
        - name: node_cidr_ipv4
          value: "<IPv4 network/subnet>"
        - name: node_cidr_ipv6
          value: "<IPv6 network/subnet>"
      ipPoolList:
        - name: pod_cidr_ipv4
          value: "<IPv4 network/subnet>"
        - name: pod_cidr_ipv6
          value: "<IPv6 network/subnet>"

To get the CIDR values and use them in the SPKInfrastructure CR, follow these instructions based on your CNI configuration:

IPv4 node/host subnet CIDR value

Use the below command to retrieve the node subnet value of the Kubernetes Cluster.

  • Flannel CNI:

    kubectl get nodes -o jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address}{"\n"}{end}' | awk -F. '{print $1"."$2"."$3".0/24"}' | sort -u

  • Calico CNI:

    kubectl get node datkube-worker -o json | jq -r '.metadata.annotations["projectcalico.org/IPv4Address"]'

IPv6 node/host subnet CIDR value

Use the below command to retrieve the node ipv6 subnet value of the Kubernetes Cluster.

  • Flannel CNI:

    kubectl get nodes -o jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address}{"\n"}{end}' | grep -E '([0-9a-fA-F]{1,4}:){2,7}[0-9a-fA-F]{1,4}' | head -n 1 | awk -F: '{print $1":"$2":"$3":"$4":0::/64"}' | awk  '{print $2}'

  • Calico CNI:

    kubectl get node datkube-worker -o json | jq -r '.metadata.annotations["projectcalico.org/IPv6Address"]'

IPv4 Pod subnet CIDR value

Use below command to retrieve the pod ipv4 subnet value:

  • Flannel CNI:

    kubectl -n kube-flannel get configmap kube-flannel-cfg -o yaml | grep '"Network"' | awk -F '"' '{print $4}'

  • Calico CNI:

    kubectl get ippools -o yaml | awk '/cidr:/ {if ($2 ~ ":") print "IPv6: " $2; else print "IPv4: " $2}' |grep IPv4

IPv6 Pod subnet CIDR value

Use below command to retrieve the pod ipv6 subnet value:

  • Flannel CNI:

    kubectl -n kube-flannel get configmap kube-flannel-cfg -o yaml | grep '"IPv6Network"' | awk -F '"' '{print $4}'

  • Calico CNI:

    kubectl get ippools -o yaml | awk '/cidr:/ {if ($2 ~ ":") print "IPv6: " $2; else print "IPv4: " $2}' |grep IPv6