dhcp-daemonset.yaml

kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-dhcp-cfg
  namespace: kube-system
  labels:
    tier: node
    app: dhcp
data:
  # We require `br0` interface to be already created before bootstrapping
  # the kubernetes cluster.
  bridge.conf: |
    {
      "name": "bridgenet",
      "type": "bridge",
      "bridge": "br0",
      "ipMasq": false,
      "isDefaultGateway": false,
      "hairpinMode": false,
      "ipam": {
        "type": "dhcp" 
      }
    }

---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-dhcp-daemon
  namespace: kube-system
  labels:
    tier: node
    app: dhcp
spec:
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        tier: node
        app: dhcp
    spec:
      # Need to be hostNetwork: true for socket files to work
      hostNetwork: true
      # Need to be hostPID: true so that dhcp process can access all of the netns entries in /proc
      # for all of the containers being spun up (otherwise dhcp would only see itslef in /proc)
      hostPID: true
      nodeSelector:
        beta.kubernetes.io/arch: amd64
      tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      initContainers:
      - name: install-cni
        # This image can be any image with `cp` binary available
        image: busybox
        # Set up the bridge CNI config file on the host. Pre-requisite is that a br0 bridge interface
        # was set up and bridged to the LAN
        command:
        - cp
        args:
        - -f
        - /cfg/bridge.conf
        - /etc/cni/net.d/10-bridge.conf
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: dhcp-cfg
          mountPath: /cfg
      containers:
      - name: kube-dhcp
        # This can be any image with /bin/sh, rm, and the CGO_ENABLED=0 compiled
        # dhcp daemon at /dhcp. Busybox is a perfectly fine base tiny image.
        image: opensourcelan/dhcp-cni-plugin:20180718-194152
        command:
        - /bin/sh
        args:
        - -c
        # Gotta rm the sock file first; this daemon doesn't clean up its own and
        # it crashes if it already exists
        - 'rm -f /run/cni/dhcp.sock; exec /dhcp daemon'
        resources:
          requests:
            cpu: "10m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: true
        volumeMounts:
        - name: run
          mountPath: /run
      volumes:
        - name: run
          hostPath:
            path: /run
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: dhcp-cfg
          configMap:
            name: kube-dhcp-cfg