feat(chart): add node-local-dns chart

valerius257 · Jun 17, 2020 · 7d8cd32 · 7d8cd32
1 parent c00bf4c
commit 7d8cd32
Show file tree

Hide file tree

Showing 8 changed files with 345 additions and 0 deletions.
diff --git a/Chart.yaml b/Chart.yaml
@@ -0,0 +1,15 @@
+---
+apiVersion: v2
+name: node-local-dns
+description: NodeLocal DNS Cache
+version: 1.0.0
+appVersion: 1.15.13
+keywords:
+  - node
+  - dns
+  - cache
+sources:
+  - https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns/nodelocaldns
+maintainers:
+  - name: valerius257
+    email: [email protected]
diff --git a/templates/NOTES.txt b/templates/NOTES.txt
diff --git a/templates/_helpers.tpl b/templates/_helpers.tpl
@@ -0,0 +1,63 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "node-local-dns.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "node-local-dns.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "node-local-dns.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "node-local-dns.labels" -}}
+helm.sh/chart: {{ include "node-local-dns.chart" . }}
+{{ include "node-local-dns.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "node-local-dns.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "node-local-dns.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "node-local-dns.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "node-local-dns.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
diff --git a/templates/configmap.yaml b/templates/configmap.yaml
@@ -0,0 +1,72 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "node-local-dns.fullname" . }}
+  labels:
+    {{- include "node-local-dns.labels" . | nindent 4 }}
+data:
+  Corefile: |
+    {{ .Values.config.clusterDomain }}:53 {
+      errors
+      cache {
+        success 9984 30
+        denial 9984 5
+      }
+      reload
+      loop
+      bind {{ .Values.config.localDnsIp }} {{ .Values.config.kubeDnsSvcIp }}
+      {{- if .Values.config.upstreamDnsUseTcp }}
+      forward . {{ .Values.config.nodeLocalSvcIp }} {
+        force_tcp
+      }
+      {{ else }}
+      forward . {{ .Values.config.nodeLocalSvcIp }}
+      {{- end }}
+      prometheus :9253
+      health :8080
+    }
+    in-addr.arpa:53 {
+      errors
+      cache 30
+      reload
+      loop
+      bind {{ .Values.config.localDnsIp }} {{ .Values.config.kubeDnsSvcIp }}
+      {{- if .Values.config.upstreamDnsUseTcp }}
+      forward . {{ .Values.config.nodeLocalSvcIp }} {
+        force_tcp
+      }
+      {{ else }}
+      forward . {{ .Values.config.nodeLocalSvcIp }}
+      {{- end }}
+      prometheus :9253
+    }
+    ip6.arpa:53 {
+      errors
+      cache 30
+      reload
+      loop
+      bind {{ .Values.config.localDnsIp }} {{ .Values.config.kubeDnsSvcIp }}
+      {{- if .Values.config.upstreamDnsUseTcp }}
+      forward . {{ .Values.config.nodeLocalSvcIp }} {
+        force_tcp
+      }
+      {{ else }}
+      forward . {{ .Values.config.nodeLocalSvcIp }}
+      {{- end }}
+      prometheus :9253
+    }
+    .:53 {
+      errors
+      cache 30
+      reload
+      loop
+      bind {{ .Values.config.localDnsIp }} {{ .Values.config.kubeDnsSvcIp }}
+      {{- if .Values.config.upstreamDnsUseTcp }}
+      forward . {{ .Values.config.upstreamDns }} {
+        force_tcp
+      }
+      {{ else }}
+      forward . {{ .Values.config.upstreamDns }}
+      {{- end }}
+      prometheus :9253
+    }
diff --git a/templates/daemonset.yaml b/templates/daemonset.yaml
@@ -0,0 +1,88 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: {{ include "node-local-dns.fullname" . }}
+  labels:
+    {{- include "node-local-dns.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "node-local-dns.selectorLabels" . | nindent 6 }}
+  updateStrategy:
+    {{- toYaml .Values.updateStrategy | nindent 4 }}
+  template:
+    metadata:
+      annotations:
+        checksum/configmaps: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
+        {{- if .Values.podAnnotations }}
+        {{- toYaml .Values.podAnnotations | nindent 8 }}
+        {{- end }}
+      labels:
+        {{- include "node-local-dns.selectorLabels" . | nindent 8 }}
+    spec:
+      imagePullSecrets:
+        {{- toYaml .Values.imagePullSecrets | nindent 8 }}
+      serviceAccountName: {{ include "node-local-dns.serviceAccountName" . }}
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      priorityClassName: {{ .Values.priorityClassName }}
+      hostNetwork: {{ .Values.useHostNetwork }}
+      dnsPolicy: Default
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          args:
+            - -localip
+            - "{{ .Values.config.localDnsIp }},{{ .Values.config.kubeDnsSvcIp }}"
+            - -conf
+            - /etc/Corefile
+            - -upstreamsvc
+            - {{ include "node-local-dns.fullname" . }}-upstream
+          ports:
+            - name: dns-udp
+              containerPort: 53
+              protocol: UDP
+            - name: dns-tcp
+              containerPort: 53
+              protocol: TCP
+            - name: metrics
+              containerPort: 9253
+              protocol: TCP
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          livenessProbe:
+            {{- toYaml .Values.livenessProbe | nindent 12 }}
+          readinessProbe:
+            {{- toYaml .Values.readinessProbe | nindent 12 }}
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+          volumeMounts:
+            - mountPath: /run/xtables.lock
+              name: xtables-lock
+              readOnly: false
+            - name: kube-dns-config
+              mountPath: /etc/kube-dns
+            - name: config
+              mountPath: /etc/coredns
+      nodeSelector:
+        {{- toYaml .Values.nodeSelector | nindent 8 }}
+      affinity:
+        {{- toYaml .Values.affinity | nindent 8 }}
+      tolerations:
+        {{- toYaml .Values.tolerations | nindent 8 }}
+      volumes:
+        - name: xtables-lock
+          hostPath:
+            path: /run/xtables.lock
+            type: FileOrCreate
+        - name: kube-dns-config
+          configMap:
+            name: kube-dns
+            optional: true
+        - name: config
+          configMap:
+            name: {{ include "node-local-dns.fullname" . }}
+            items:
+              - key: Corefile
+                path: Corefile.base
diff --git a/templates/service.yaml b/templates/service.yaml
@@ -0,0 +1,22 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "node-local-dns.fullname" . }}-upstream
+  labels:
+    {{- include "node-local-dns.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  {{- if ne .Values.config.nodeLocalSvcIp "__PILLAR__CLUSTER__DNS__" }}
+  clusterIP: {{ .Values.config.nodeLocalSvcIp }}
+  {{- end }}
+  ports:
+    - name: dns-udp
+      port: {{ .Values.service.udpPort }}
+      targetPort: 53
+      protocol: UDP
+    - name: dns-tcp
+      port: {{ .Values.service.tcpPort }}
+      targetPort: 53
+      protocol: TCP
+  selector:
+    {{- toYaml .Values.service.upstreamSelector | nindent 4 }}
diff --git a/templates/serviceaccount.yaml b/templates/serviceaccount.yaml
@@ -0,0 +1,12 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "node-local-dns.serviceAccountName" . }}
+  labels:
+    {{- include "node-local-dns.labels" . | nindent 4 }}
+  {{- with .Values.serviceAccount.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}
diff --git a/values.yaml b/values.yaml
@@ -0,0 +1,73 @@
+---
+image:
+  repository: k8s.gcr.io/k8s-dns-node-cache
+  pullPolicy: IfNotPresent
+  tag: 1.15.13
+
+imagePullSecrets: []
+
+config:
+  clusterDomain: cluster.local
+  localDnsIp: 169.254.20.10
+  kubeDnsSvcIp: 10.100.0.10
+  nodeLocalSvcIp: __PILLAR__CLUSTER__DNS__   # random IP, could be changed to static
+  upstreamDns: __PILLAR__UPSTREAM__SERVERS__ # defaults to /etc/resolv.conf
+  upstreamDnsUseTcp: false
+
+useHostNetwork: true
+
+service:
+  type: ClusterIP
+  udpPort: 53
+  tcpPort: 53
+  upstreamSelector:
+    k8s-app: kube-dns
+
+updateStrategy:
+  rollingUpdate:
+    maxUnavailable: 10%
+
+priorityClassName: system-node-critical
+podAnnotations: {}
+podSecurityContext: {}
+
+securityContext:
+  privileged: true
+
+livenessProbe:
+  httpGet:
+    path: /health
+    port: 8080
+  initialDelaySeconds: 5
+  timeoutSeconds: 5
+
+readinessProbe:
+  httpGet:
+    path: /health
+    port: 8080
+  initialDelaySeconds: 10
+  timeoutSeconds: 5
+
+serviceAccount:
+  create: true
+  annotations: {}
+  name: ""
+
+nodeSelector: {}
+affinity: {}
+
+tolerations:
+  - key: CriticalAddonsOnly
+    operator: Exists
+  - effect: NoExecute
+    operator: Exists
+  - effect: NoSchedule
+    operator: Exists
+
+resources:
+  requests:
+    cpu: 25m
+    memory: 5Mi
+  limits:
+    cpu: 50m
+    memory: 20Mi