ansible/roles/kubedns/templates/kubedns-deployment.yml

   1 {#
   2 Copyright 2019 Nokia
   3
   4 Licensed under the Apache License, Version 2.0 (the "License");
   5 you may not use this file except in compliance with the License.
   6 You may obtain a copy of the License at
   7
   8     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 Unless required by applicable law or agreed to in writing, software
  11 distributed under the License is distributed on an "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 See the License for the specific language governing permissions and
  14 limitations under the License.
  15 #}
  16 ---
  17 apiVersion: apps/v1
  18 kind: DaemonSet
  19 metadata:
  20   name: kube-dns
  21   namespace: kube-system
  22   labels:
  23     {{ caas.kubernetes_component_label }}: kube-dns
  24     kubernetes.io/cluster-service: "true"
  25     addonmanager.kubernetes.io/mode: Reconcile
  26 spec:
  27   selector:
  28     matchLabels:
  29       {{ caas.kubernetes_component_label }}: kube-dns
  30   template:
  31     metadata:
  32       labels:
  33         {{ caas.kubernetes_component_label }}: kube-dns
  34       annotations:
  35         scheduler.alpha.kubernetes.io/critical-pod: ''
  36         scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
  37     spec:
  38       priorityClassName: "system-cluster-critical"
  39       hostNetwork: true
  40       nodeSelector:
  41         nodetype: caas_master
  42       tolerations:
  43       - key: "CriticalAddonsOnly"
  44         operator: "Exists"
  45       volumes:
  46       - name: time-mount
  47         hostPath:
  48           path: /etc/localtime
  49       - name: secret
  50         hostPath:
  51           path: /etc/kubernetes/ssl
  52       - name: secret-root-ca
  53         hostPath:
  54           path: /etc/openssl/ca.pem
  55       - name: resolv
  56         hostPath:
  57           path: /etc/resolv.conf
  58       - name: kubeconfig
  59         hostPath:
  60           path: /etc/kubernetes/kubeconfig
  61       - name: external-dns-conf
  62         configMap:
  63           name: external-dns-cm
  64       containers:
  65       - name: kubedns
  66         image: {{ container_image_names | select('search', '/kubedns') | list | last }}
  67         securityContext:
  68           runAsUser: {{ caas.uid.kubedns }}
  69         resources:
  70           # TODO: Set memory limits when we've profiled the container for large
  71           # clusters, then set request = limit to keep this container in
  72           # guaranteed class. Currently, this container falls into the
  73           # "burstable" category so the kubelet doesn't backoff from restarting it.
  74           limits:
  75             memory: 170Mi
  76           requests:
  77             cpu: 10m
  78             memory: 70Mi
  79         livenessProbe:
  80           tcpSocket:
  81             port: 10053
  82           initialDelaySeconds: 60
  83           timeoutSeconds: 5
  84           successThreshold: 1
  85           failureThreshold: 5
  86         readinessProbe:
  87           httpGet:
  88             path: /readiness
  89             port: 8081
  90             scheme: HTTP
  91           # we poll on pod startup for the Kubernetes master service and
  92           # only setup the /readiness HTTP server once that's available.
  93           initialDelaySeconds: 3
  94           timeoutSeconds: 5
  95         command:
  96         - /usr/bin/kube-dns
  97         args:
  98         - --domain={{ caas.dns_domain }}.
  99         - --dns-port=10053
 100         - --config-dir=/etc/dns_config
 101         - --v=2
 102         ports:
 103         - containerPort: 10053
 104           name: dns-local
 105           protocol: UDP
 106         - containerPort: 10053
 107           name: dns-tcp-local
 108           protocol: TCP
 109         - containerPort: 10055
 110           name: metrics
 111           protocol: TCP
 112         resources:
 113           requests:
 114             cpu: 10m
 115             memory: 70Mi
 116         volumeMounts:
 117         - name: time-mount
 118           mountPath: /etc/localtime
 119           readOnly: true
 120         - name: secret
 121           mountPath: /etc/kubernetes/ssl
 122           readOnly: true
 123         - name: secret-root-ca
 124           mountPath: /etc/openssl/ca.pem
 125           readOnly: true
 126         - name: kubeconfig
 127           mountPath: /etc/kubernetes/kubeconfig
 128           readOnly: true
 129         - name: resolv
 130           mountPath: /etc/resolv.conf
 131         - name: external-dns-conf
 132           mountPath: /etc/dns_config
 133       - name: dnsmasq
 134         image: {{ container_image_names | select('search', '/kubedns') | list | last }}
 135         securityContext:
 136           capabilities:
 137             add: ["NET_BIND_SERVICE"]
 138           runAsUser: {{ caas.uid.kubedns }}
 139         livenessProbe:
 140           tcpSocket:
 141             port: 53
 142           initialDelaySeconds: 60
 143           timeoutSeconds: 5
 144           successThreshold: 1
 145           failureThreshold: 5
 146         command:
 147         - /usr/bin/dnsmasq-nanny
 148         args:
 149         - -v=2
 150         - -logtostderr
 151         - -configDir=/etc/k8s/dns/dnsmasq-nanny
 152         - -restartDnsmasq=true
 153         - --
 154         - -k
 155         - --interface={{ networking.infra_internal.interface }}
 156         - --bind-interfaces
 157         - --dns-forward-max=1000
 158         - --cache-size=10000
 159         - --server=/{{ caas.dns_domain }}/127.0.0.1#10053
 160         # see: https://github.com/kubernetes/kubernetes/issues/29055 for details
 161         resources:
 162           requests:
 163             cpu: 150m
 164             memory: 20Mi
 165         volumeMounts:
 166         - name: time-mount
 167           mountPath: /etc/localtime
 168           readOnly: true
 169         - name: secret
 170           mountPath: /etc/kubernetes/ssl
 171           readOnly: true
 172         - name: kubeconfig
 173           mountPath: /etc/kubernetes/kubeconfig
 174           readOnly: true
 175         - name: resolv
 176           mountPath: /etc/resolv.conf
 177         - name: external-dns-conf
 178           mountPath: /etc/k8s/dns/dnsmasq-nanny
 179       dnsPolicy: Default  # Don't use cluster DNS.
 180       serviceAccountName: kube-dns