kubespray/roles/kubernetes-apps/ansible/templates/kubedns-autoscaler.yml.j2

---
# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: kubedns-autoscaler
  namespace: kube-system
  labels:
    k8s-app: kubedns-autoscaler
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  template:
    metadata:
      labels:
        k8s-app: kubedns-autoscaler
    spec:
{% if kube_version is version('v1.11.1', '>=') %}
      priorityClassName: system-cluster-critical
{% endif %}
      # When having win nodes in cluster without this patch, this pod cloud try to be created in windows
      nodeSelector:
        beta.kubernetes.io/os: linux
      tolerations:
        - effect: NoSchedule
          operator: Equal
          key: node-role.kubernetes.io/master
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - topologyKey: "kubernetes.io/hostname"
            labelSelector:
              matchLabels:
                k8s-app: kubedns-autoscaler
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            preference:
              matchExpressions:
              - key: node-role.kubernetes.io/master
                operator: In
                values:
                - "true"
      containers:
      - name: autoscaler
        image: "{{ kubednsautoscaler_image_repo }}:{{ kubednsautoscaler_image_tag }}"
        resources:
          requests:
            cpu: "20m"
            memory: "10Mi"
        command:
        - /cluster-proportional-autoscaler
        - --namespace=kube-system
        - --configmap=kubedns-autoscaler
        # Should keep target in sync with cluster/addons/dns/kubedns-controller.yaml.base
        - --target=Deployment/kube-dns
        - --default-params={"linear":{"nodesPerReplica":{{ kubedns_nodes_per_replica }},"min":{{ kubedns_min_replicas }}}}
        - --logtostderr=true
        - --v=2
      serviceAccountName: cluster-proportional-autoscaler