kubespray/roles/kubernetes-apps/ansible/templates/kubedns-rc.yml

apiVersion: v1
kind: ReplicationController
metadata:
  name: kubedns
  namespace: {{ system_namespace }}
  labels:
    k8s-app: kubedns
    version: v19
    kubernetes.io/cluster-service: "true"
spec:
  replicas: {{ dns_replicas }}
  selector:
    k8s-app: kubedns
    version: v19
  template:
    metadata:
      labels:
        k8s-app: kubedns
        version: v19
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: kubedns
        image: "{{ kubedns_image_repo }}:{{ kubedns_image_tag }}"
        imagePullPolicy: {{ k8s_image_pull_policy }}
        resources:
          # TODO: Set memory limits when we've profiled the container for large
          # clusters, then set request = limit to keep this container in
          # guaranteed class. Currently, this container falls into the
          # "burstable" category so the kubelet doesn't backoff from restarting it.
          limits:
            cpu: {{ dns_cpu_limit }}
            memory: {{ dns_memory_limit }}
          requests:
            cpu: {{ dns_cpu_requests }}
            memory: {{ dns_memory_requests }}
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        readinessProbe:
          httpGet:
            path: /readiness
            port: 8081
            scheme: HTTP
          # we poll on pod startup for the Kubernetes master service and
          # only setup the /readiness HTTP server once that's available.
          initialDelaySeconds: 30
          timeoutSeconds: 5
        args:
        # command = "/kube-dns"
        - --domain={{ dns_domain }}.
        - --dns-port=10053
        - --v={{ kube_log_level }}
        ports:
        - containerPort: 10053
          name: dns-local
          protocol: UDP
        - containerPort: 10053
          name: dns-tcp-local
          protocol: TCP
      - name: dnsmasq
        image: "{{ kubednsmasq_image_repo }}:{{ kubednsmasq_image_tag }}"
        imagePullPolicy: {{ k8s_image_pull_policy }}
        resources:
          limits:
            cpu: {{ dns_cpu_limit }}
            memory: {{ dns_memory_limit }}
          requests:
            cpu: {{ dns_cpu_requests }}
            memory: {{ dns_memory_requests }}
        args:
        - --log-facility=-
        - --cache-size=1000
        - --no-resolv
        - --server=127.0.0.1#10053
{% if kube_log_level == '4' %}
        - --log-queries
{% endif %}
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
      - name: healthz
        image: "{{ exechealthz_image_repo }}:{{ exechealthz_image_tag }}"
        imagePullPolicy: {{ k8s_image_pull_policy }}
        resources:
          # keep request = limit to keep this container in guaranteed class
          limits:
            cpu: 10m
            memory: 50Mi
          requests:
            cpu: 10m
            # Note that this container shouldn't really need 50Mi of memory. The
            # limits are set higher than expected pending investigation on #29688.
            # The extra memory was stolen from the kubedns container to keep the
            # net memory requested by the pod constant.
            memory: 50Mi
        args:
        - -cmd=nslookup kubernetes.default.svc.{{ dns_domain }} 127.0.0.1 >/dev/null && nslookup kubernetes.default.svc.{{ dns_domain }} 127.0.0.1:10053 >/dev/null
        - -port=8080
        - -quiet
        ports:
        - containerPort: 8080
          protocol: TCP
      dnsPolicy: Default  # Don't use cluster DNS.