68ed2bdd35
As kube-dns transitioned to fat manifests, it's no longer required to use arch suffixed images. This change makes use of fat manifests for kube-dns and removes the last few calls to the GetGenericArchImage function, thus removing GetGenericArchImage too. Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>
359 lines
9.2 KiB
Go
359 lines
9.2 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package dns
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const (
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// KubeDNSDeployment is the kube-dns Deployment manifest for the kube-dns manifest for v1.7+
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KubeDNSDeployment = `
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: kube-dns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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spec:
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# replicas: not specified here:
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# 1. In order to make Addon Manager do not reconcile this replicas parameter.
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# 2. Default is 1.
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# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
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strategy:
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rollingUpdate:
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maxSurge: 10%
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maxUnavailable: 0
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selector:
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matchLabels:
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k8s-app: kube-dns
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template:
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metadata:
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labels:
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k8s-app: kube-dns
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spec:
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volumes:
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- name: kube-dns-config
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configMap:
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name: kube-dns
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optional: true
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containers:
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- name: kubedns
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image: {{ .ImageRepository }}/k8s-dns-kube-dns:{{ .Version }}
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imagePullPolicy: IfNotPresent
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resources:
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# TODO: Set memory limits when we've profiled the container for large
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# clusters, then set request = limit to keep this container in
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# guaranteed class. Currently, this container falls into the
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# "burstable" category so the kubelet doesn't backoff from restarting it.
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limits:
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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livenessProbe:
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httpGet:
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path: /healthcheck/kubedns
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port: 10054
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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readinessProbe:
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httpGet:
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path: /readiness
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port: 8081
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scheme: HTTP
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# we poll on pod startup for the Kubernetes master service and
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# only setup the /readiness HTTP server once that's available.
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initialDelaySeconds: 3
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timeoutSeconds: 5
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args:
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- --domain={{ .DNSDomain }}.
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- --dns-port=10053
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- --config-dir=/kube-dns-config
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- --v=2
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env:
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- name: PROMETHEUS_PORT
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value: "10055"
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ports:
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- containerPort: 10053
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name: dns-local
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protocol: UDP
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- containerPort: 10053
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name: dns-tcp-local
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protocol: TCP
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- containerPort: 10055
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name: metrics
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protocol: TCP
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volumeMounts:
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- name: kube-dns-config
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mountPath: /kube-dns-config
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- name: dnsmasq
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image: {{ .ImageRepository }}/k8s-dns-dnsmasq-nanny:{{ .Version }}
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imagePullPolicy: IfNotPresent
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livenessProbe:
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httpGet:
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path: /healthcheck/dnsmasq
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port: 10054
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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args:
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- -v=2
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- -logtostderr
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- -configDir=/etc/k8s/dns/dnsmasq-nanny
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- -restartDnsmasq=true
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- --
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- -k
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- --cache-size=1000
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- --no-negcache
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- --dns-loop-detect
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- --log-facility=-
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- --server=/{{ .DNSDomain }}/{{ .DNSBindAddr }}#10053
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- --server=/in-addr.arpa/{{ .DNSBindAddr }}#10053
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- --server=/ip6.arpa/{{ .DNSBindAddr }}#10053
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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# see: https://github.com/kubernetes/kubernetes/issues/29055 for details
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resources:
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requests:
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cpu: 150m
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memory: 20Mi
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volumeMounts:
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- name: kube-dns-config
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mountPath: /etc/k8s/dns/dnsmasq-nanny
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- name: sidecar
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image: {{ .ImageRepository }}/k8s-dns-sidecar:{{ .Version }}
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imagePullPolicy: IfNotPresent
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livenessProbe:
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httpGet:
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path: /metrics
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port: 10054
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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args:
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- --v=2
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- --logtostderr
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- --probe=kubedns,{{ .DNSProbeAddr }}:10053,kubernetes.default.svc.{{ .DNSDomain }},5,SRV
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- --probe=dnsmasq,{{ .DNSProbeAddr }}:53,kubernetes.default.svc.{{ .DNSDomain }},5,SRV
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ports:
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- containerPort: 10054
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name: metrics
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protocol: TCP
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resources:
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requests:
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memory: 20Mi
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cpu: 10m
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dnsPolicy: Default # Don't use cluster DNS.
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serviceAccountName: kube-dns
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tolerations:
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- key: CriticalAddonsOnly
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operator: Exists
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- key: {{ .MasterTaintKey }}
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effect: NoSchedule
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`
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// KubeDNSService is the kube-dns Service manifest
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KubeDNSService = `
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apiVersion: v1
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kind: Service
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metadata:
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labels:
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k8s-app: kube-dns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "KubeDNS"
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name: kube-dns
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namespace: kube-system
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annotations:
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prometheus.io/port: "9153"
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prometheus.io/scrape: "true"
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# Without this resourceVersion value, an update of the Service between versions will yield:
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# Service "kube-dns" is invalid: metadata.resourceVersion: Invalid value: "": must be specified for an update
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resourceVersion: "0"
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spec:
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clusterIP: {{ .DNSIP }}
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ports:
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- name: dns
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port: 53
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protocol: UDP
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targetPort: 53
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- name: dns-tcp
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port: 53
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protocol: TCP
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targetPort: 53
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selector:
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k8s-app: kube-dns
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`
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// CoreDNSDeployment is the CoreDNS Deployment manifest
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CoreDNSDeployment = `
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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spec:
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replicas: 2
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strategy:
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type: RollingUpdate
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rollingUpdate:
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maxUnavailable: 1
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selector:
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matchLabels:
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k8s-app: kube-dns
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template:
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metadata:
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labels:
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k8s-app: kube-dns
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spec:
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serviceAccountName: coredns
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tolerations:
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- key: CriticalAddonsOnly
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operator: Exists
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- key: {{ .MasterTaintKey }}
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effect: NoSchedule
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containers:
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- name: coredns
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image: {{ .ImageRepository }}/coredns:{{ .Version }}
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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readOnly: true
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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- containerPort: 9153
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name: metrics
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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securityContext:
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allowPrivilegeEscalation: false
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capabilities:
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add:
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- NET_BIND_SERVICE
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drop:
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- all
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readOnlyRootFilesystem: true
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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`
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// CoreDNSConfigMap is the CoreDNS ConfigMap manifest
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CoreDNSConfigMap = `
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: coredns
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namespace: kube-system
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data:
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Corefile: |
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.:53 {
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errors
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health
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kubernetes {{ .DNSDomain }} in-addr.arpa ip6.arpa {
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pods insecure
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upstream
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fallthrough in-addr.arpa ip6.arpa
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}{{ .Federation }}
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prometheus :9153
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proxy . {{ .UpstreamNameserver }}
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cache 30
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loop
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reload
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loadbalance
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}{{ .StubDomain }}
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`
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// CoreDNSClusterRole is the CoreDNS ClusterRole manifest
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CoreDNSClusterRole = `
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: system:coredns
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rules:
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- apiGroups:
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- ""
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resources:
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- endpoints
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- services
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- pods
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- namespaces
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verbs:
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- list
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- watch
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`
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// CoreDNSClusterRoleBinding is the CoreDNS Clusterrolebinding manifest
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CoreDNSClusterRoleBinding = `
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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name: system:coredns
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:coredns
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subjects:
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- kind: ServiceAccount
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name: coredns
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namespace: kube-system
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`
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// CoreDNSServiceAccount is the CoreDNS ServiceAccount manifest
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CoreDNSServiceAccount = `
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: coredns
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namespace: kube-system
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`
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)
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