Add guestbook example for Helm. Issue #3191

docs/examples/README.md

@@ -17,3 +17,9 @@ and it illustrates more complex template usage.
 It deploys a `deployment` (which creates a `replica set`), a `config
 map`, and a `service`. The replica set starts an nginx pod. The config
 map stores the files that the nginx server can serve.
+
+## Guestbook
+
+The `guestbook` chart is a simple multi-tier app. The first tier is Apache httpd-based app that uses Redis master-slave cluster (the second tier). 
+
+The app comprises of `deployment` for the each tier that are accessible thru its corresponding `service`

docs/examples/guestbook/.helmignore

@@ -0,0 +1,21 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

docs/examples/guestbook/Chart.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+name: guestbook
+version: 0.1.0
+description: Guestbook Helm chart for Kubernetes.
+sources:
+   - https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook
+maintainers:
+   - name: Yahav Biran
+   - email: ybiran@colostate.edu

docs/examples/guestbook/templates/NOTES.txt

@@ -0,0 +1,17 @@
+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range .Values.ingress.hosts }}
+  http://{{ . }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.frontend.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ template "gbhelm.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.frontend.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get svc -w {{ template "gbhelm.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ template "gbhelm.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+  echo http://$SERVICE_IP:{{ .Values.service.externalPort }}
+{{- else if contains "ClusterIP" .Values.service.frontend.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app={{ template "gbhelm.name" . }},release={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+{{- end }}

docs/examples/guestbook/templates/_helpers.tpl

@@ -0,0 +1,16 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "gbhelm.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).
+*/}}
+{{- define "gbhelm.fullname" -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

docs/examples/guestbook/templates/frontend-deployment.yaml

@@ -0,0 +1,39 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ "frontend" }}
+  labels:
+    app: {{ template "gbhelm.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ "1" }}
+  template:
+    metadata:
+      labels:
+        app: {{ "guestbook" }}
+        tier: {{"frontend"}}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ "php-redis" }}
+          image: "{{ .Values.image.frontend_deployment.repository }}:{{ .Values.image.frontend_deployment.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: {{ .Values.service.frontend.port }}
+          livenessProbe:
+            httpGet:
+              path: /
+              port: {{ .Values.service.frontend.port }}
+          readinessProbe:
+            httpGet:
+              path: /
+              port: {{ .Values.service.frontend.port }}
+          resources:
+            requests:
+              cpu: {{"100m"}}
+              memory: {{"100Mi"}}
+          env:
+          - name: {{"GET_HOSTS_FROM"}}
+            value: {{"dns"}}

docs/examples/guestbook/templates/frontend-service.yaml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ "frontend" }}
+  labels:
+    app: {{ "guestbook" }}
+    tier: {{ "frontend" }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  type: {{ .Values.service.frontend.type }}
+  ports:
+    - port: {{.Values.service.frontend.port}}
+  selector:
+    app: {{.Values.service.frontend.selector.app}}
+    tier: {{.Values.service.frontend.selector.tier}}

docs/examples/guestbook/templates/redis-master-deployment.yaml

@@ -0,0 +1,29 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ "redis-master" }}
+  labels:
+    app: {{ template "gbhelm.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ "1" }}
+  template:
+    metadata:
+      labels:
+        app: {{ "redis" }}
+        tier: {{"backend"}}
+        role: {{"master"}}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ "master" }}
+          image: "{{ .Values.image.redis_master.repository }}:{{ .Values.image.redis_master.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: {{ "6379" }}
+          resources:
+            requests:
+              cpu: {{"100m"}}
+              memory: {{"100Mi"}}

docs/examples/guestbook/templates/redis-master-service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ "redis-master" }}
+  labels:
+    app: {{ "redis" }}
+    role: {{ "master" }}
+    tier: {{ "backend" }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  ports:
+    - port: {{ .Values.service.redis_master.port }}
+      targetPort: {{ .Values.service.redis_master.targetPort }}
+  selector:
+    app: {{  .Values.service.redis_master.selector.app}}
+    role: {{ .Values.service.redis_master.selector.role }}
+    tier: {{ .Values.service.redis_master.selector.tier }}

docs/examples/guestbook/templates/redis-slave-deployment.yaml

@@ -0,0 +1,32 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ "redis-slave" }}
+  labels:
+    app: {{ template "gbhelm.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ "1" }}
+  template:
+    metadata:
+      labels:
+        app: {{ "redis" }}
+        tier: {{"backend"}}
+        role: {{"slave"}}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ "slave" }}
+          image: "{{ .Values.image.redis_slave.repository }}:{{ .Values.image.redis_slave.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: {{ "6379" }}
+          resources:
+            requests:
+              cpu: {{"100m"}}
+              memory: {{"100Mi"}}
+          env:
+          - name: {{"GET_HOSTS_FROM"}}
+            value: {{"dns"}}

docs/examples/guestbook/templates/redis-slave-service.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ "redis-slave" }}
+  labels:
+    app: {{ "redis" }}
+    role: {{ "slave" }}
+    tier: {{ "backend" }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  ports:
+    - port: {{.Values.service.redis_slave.port}}
+  selector:
+    app: {{.Values.service.redis_slave.selector.app}}
+    role: {{.Values.service.redis_slave.selector.role}}
+    tier: {{.Values.service.redis_slave.selector.tier}}

docs/examples/guestbook/values.yaml

@@ -0,0 +1,59 @@
+# Default values for mychart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  frontend_deployment:
+     repository: gcr.io/google-samples/gb-frontend
+     tag: v4
+  redis_master:
+     repository: gcr.io/google_containers/redis
+     tag: e2e
+  redis_slave:
+     repository: gcr.io/google_samples/gb-redisslave
+     tag: v1
+  pullPolicy: IfNotPresent
+service:
+  frontend:
+    type: LoadBalancer
+    port: 80
+    selector:
+      app: guestbook
+      tier: frontend
+  redis_master:
+    port: 6379
+    targetPort: 6379  
+    selector:
+      app: redis
+      role: master
+      tier: backend
+  redis_slave:
+    port: 6379
+    selector:
+      app: redis
+      role: slave
+      tier: backend
+ingress:
+  enabled: false
+  # Used to create an Ingress record.
+  hosts:
+    - chart-example.local
+  annotations:
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+  tls:
+    # Secrets must be manually created in the namespace.
+    # - secretName: chart-example-tls
+    #   hosts:
+    #     - chart-example.local
+resources: {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #  cpu: 100m
+  #  memory: 128Mi
+  # requests:
+  #  cpu: 100m
+  #  memory: 128Mi