tune-kindnet.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: tune-kindnet
  namespace: kube-system
  labels:
    app: tune-kindnet  
spec:
  selector:
    matchLabels:
      name: tune-kindnet
  template:
    metadata:
      labels:
        name: tune-kindnet
    spec:
      tolerations:
      - key: node-role.kubernetes.io/control-plane
        operator: Exists
        effect: NoSchedule    
      containers:
      - name: patch-kindnet
        image: gcr.io/k8s-prow/alpine:latest
        command:
        - "sh"
        - "-c"
        - |
          set -x
          while true; do
            /sbin/apk add jq && jq '
              # Define a function to increment IP
              def increment_ip:
                split(".") | map(tonumber) | .[3] += 2 | map(tostring) | join(".");
              # Extract the subnet
              .plugins[0].ipam.ranges[0][0].subnet as $subnet |
              # Split the subnet into IP and mask
              ($subnet | split("/") | .[0]) as $ip |
              ($subnet | split("/") | .[1]) as $mask |
              # Increment the IP
              ($ip | increment_ip) as $new_ip |
              # Add the new rangeStart field
              .plugins[0].ipam.ranges[0][0].rangeStart = $new_ip
            ' /etc/cni/net.d/10-kindnet.conflist > /tmp/10-kindnet.conflist && cp /tmp/10-kindnet.conflist /etc/cni/net.d/10-kindnet.conflist
            sleep 5
          done
        volumeMounts:
        - name: host-root
          mountPath: /etc/cni/net.d
      volumes:
      - name: host-root
        hostPath:
          path: /etc/cni/net.d
          type: Directory