flannel-overlay.yaml

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-windows-cfg
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
data:
  cni-conf-containerd.json: |
    {
      "name": "flannel.4096",
      "cniVersion": "0.3.0",
      "type": "flannel",
      "capabilities": {
        "portMappings": true,
        "dns": true
      },
      "delegate": {
        "type": "sdnoverlay",
        "AdditionalArgs": [
          {
            "Name": "EndpointPolicy",
            "Value": {
              "Type": "OutBoundNAT",
              "Settings" : {
                "Exceptions": []
              }
            }
          },
          {
            "Name": "EndpointPolicy",
            "Value": {
              "Type": "SDNROUTE",
              "Settings": {
                "DestinationPrefix": "",
                "NeedEncap": true
              }
            }
          },
          {
            "Name":"EndpointPolicy",
            "Value":{
              "Type":"ProviderAddress",
                "Settings":{
                    "ProviderAddress":""
              }
            }
          }
        ]
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-windows-amd64
  labels:
    tier: node
    app: flannel
  namespace: kube-flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: kubernetes.io/os
                    operator: In
                    values:
                      - windows
                  - key: kubernetes.io/arch
                    operator: In
                    values:
                      - amd64
      securityContext:
        windowsOptions:
          hostProcess: true
          runAsUserName: "NT AUTHORITY\\system"
      hostNetwork: true
      serviceAccountName: flannel
      tolerations:
      - operator: Exists
        effect: NoSchedule
        # Mark the pod as a critical add-on for rescheduling.
      - key: CriticalAddonsOnly
        operator: Exists
      - effect: NoExecute
        operator: Exists
      containers:
      - name: kube-flannel
        image: syck0/flannel:v0.21.5-hostprocess
        imagePullPolicy: Always
        volumeMounts:
        - name: flannel-cfg
          mountPath: /mounts/kube-flannel/
        - name: flannel-windows-cfg
          mountPath: /mounts/kube-flannel-windows/
        env:
        - name: CNI_BIN_PATH
          value: C:\\opt\\cni\\bin
        - name: CNI_CONFIG_PATH
          value: C:\\etc\\cni\\net.d
        - name: SERVICE_SUBNET
          value: 10.96.0.0/12
          # As of now with the currently used flannel version (last checked with v0.21.5) we need to overwrite KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT
          # in order to be able to reach the kubernetes api server. Under windows it's currently not possible to reach it over the service created by kubernetes
          # For more context and details check the corresponding PR: https://github.com/kubernetes-sigs/sig-windows-tools/pull/314
          # Especially the comments in this review: https://github.com/kubernetes-sigs/sig-windows-tools/pull/314#discussion_r1238815189
          # There is also a follow up issue on the flannel side: https://github.com/flannel-io/flannel/issues/1772
          # Once this issue is solved we should be able to remove the custom host and port to the kubernetes api server
        - name: KUBERNETES_SERVICE_HOST
          value: control-plane.minikube.internal # KUBERNETES_SERVICE_HOST_VALUE
        - name: KUBERNETES_SERVICE_PORT
          value: "8443" # replace with your "KUBERNETES_SERVICE_PORT_VALUE"
        - name: POD_NAME
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
      volumes:
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg
      - name: flannel-windows-cfg
        configMap:
          name: kube-flannel-windows-cfg