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Added sample python app with Helm chart and Dockerfile (#294)
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‎samples/python/getting-started/webfrontend/Dockerfile

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FROM python:3
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WORKDIR /python/webfrontend
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RUN pip install flask
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COPY webfrontend.py webfrontend.py
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COPY public/ public/
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EXPOSE 80
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CMD ["python", "./webfrontend.py"]

‎samples/python/getting-started/webfrontend/public/app.css

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/* Copyright (c) Microsoft Corporation. All rights reserved.
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Licensed under the MIT License. */
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.message {
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font-family: Courier New, Courier, monospace;
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font-weight: bold;
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}

‎samples/python/getting-started/webfrontend/public/app.js

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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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var app = angular.module('myApp', ['ngRoute']);
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app.controller('MainController', function($scope, $http) {
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$scope.messages = [];
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$scope.sayHelloToServer = function() {
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$http.get("/api?_=" + Date.now()).then(function(response) {
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$scope.messages.push(response.data);
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});
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};
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$scope.sayHelloToServer();
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});

‎samples/python/getting-started/webfrontend/public/index.html

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<!-- Copyright (c) Microsoft Corporation. All rights reserved.
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Licensed under the MIT License. -->
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<!doctype html>
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<html ng-app="myApp">
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<head>
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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.3/angular-route.js"></script>
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<script src="/public/app.js"></script>
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<link rel="stylesheet" href="/public/app.css">
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<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
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<!-- Uncomment the next line -->
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<!-- <meta name="viewport" content="width=device-width, initial-scale=1"> -->
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</head>
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<body style="margin-left:10px; margin-right:10px;">
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<div ng-controller="MainController">
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<h2>Server Says</h2>
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<div class="row">
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<div class="col-xs-8 col-md-10">
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<div ng-repeat="message in messages track by $index">
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<span class="message">{{message}}</span>
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</div>
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</div>
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<div class="col-xs-4 col-md-2">
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<button class="btn btn-primary" ng-click="sayHelloToServer()">Say It Again</button>
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</div>
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</div>
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</div>
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</body>
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</html>

‎samples/python/getting-started/webfrontend/webfrontend.py

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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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from flask import Flask, request, send_from_directory
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app = Flask(__name__, static_url_path='')
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@app.route('/public/<path:path>')
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def static_files(path):
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return send_from_directory('public', path)
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@app.route('/api')
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def api():
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return 'Hello from webfrontend'
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@app.route('/')
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def index():
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return send_from_directory('public', 'index.html')
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if __name__ == '__main__':
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app.run(host='0.0.0.0', port=80)

‎samples/python/getting-started/webfrontend/webfrontend/.helmignore

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

‎samples/python/getting-started/webfrontend/webfrontend/Chart.yaml

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apiVersion: v1
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appVersion: "1.0"
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description: A Helm chart for Kubernetes
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name: webfrontend
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version: 0.1.0

‎samples/python/getting-started/webfrontend/webfrontend/templates/NOTES.txt

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1. Get the application URL by running these commands:
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{{- if .Values.ingress.enabled }}
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{{- range $host := .Values.ingress.hosts }}
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{{- range $.Values.ingress.paths }}
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http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host }}{{ . }}
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{{- end }}
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{{- end }}
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{{- else if contains "NodePort" .Values.service.type }}
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export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "webfrontend.fullname" . }})
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export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
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echo http://$NODE_IP:$NODE_PORT
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{{- else if contains "LoadBalancer" .Values.service.type }}
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NOTE: It may take a few minutes for the LoadBalancer IP to be available.
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You can watch the status of by running 'kubectl get svc -w {{ include "webfrontend.fullname" . }}'
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export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "webfrontend.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
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echo http://$SERVICE_IP:{{ .Values.service.port }}
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{{- else if contains "ClusterIP" .Values.service.type }}
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export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "webfrontend.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
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echo "Visit http://127.0.0.1:8080 to use your application"
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kubectl port-forward $POD_NAME 8080:80
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{{- end }}

‎samples/python/getting-started/webfrontend/webfrontend/templates/_helpers.tpl

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{{/* vim: set filetype=mustache: */}}
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{{/*
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Expand the name of the chart.
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*/}}
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{{- define "webfrontend.name" -}}
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{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
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{{- end -}}
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{{/*
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Create a default fully qualified app name.
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We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
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If release name contains chart name it will be used as a full name.
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*/}}
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{{- define "webfrontend.fullname" -}}
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{{- if .Values.fullnameOverride -}}
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{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
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{{- else -}}
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{{- $name := default .Chart.Name .Values.nameOverride -}}
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{{- if contains $name .Release.Name -}}
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{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
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{{- else -}}
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{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Create chart name and version as used by the chart label.
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*/}}
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{{- define "webfrontend.chart" -}}
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{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
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{{- end -}}

‎samples/python/getting-started/webfrontend/webfrontend/templates/deployment.yaml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: {{ include "webfrontend.fullname" . }}
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labels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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helm.sh/chart: {{ include "webfrontend.chart" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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app.kubernetes.io/managed-by: {{ .Release.Service }}
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spec:
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replicas: {{ .Values.replicaCount }}
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selector:
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matchLabels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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template:
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metadata:
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labels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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spec:
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containers:
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- name: {{ .Chart.Name }}
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image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
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imagePullPolicy: {{ .Values.image.pullPolicy }}
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ports:
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- name: http
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containerPort: 80
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /
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port: http
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readinessProbe:
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httpGet:
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path: /
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port: http
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resources:
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{{- toYaml .Values.resources | nindent 12 }}
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{{- with .Values.nodeSelector }}
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nodeSelector:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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{{- with .Values.affinity }}
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affinity:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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{{- with .Values.tolerations }}
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tolerations:
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{{- toYaml . | nindent 8 }}
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{{- end }}

‎samples/python/getting-started/webfrontend/webfrontend/templates/ingress.yaml

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{{- if .Values.ingress.enabled -}}
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{{- $fullName := include "webfrontend.fullname" . -}}
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{{- $ingressPaths := .Values.ingress.paths -}}
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: {{ $fullName }}
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labels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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helm.sh/chart: {{ include "webfrontend.chart" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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app.kubernetes.io/managed-by: {{ .Release.Service }}
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{{- with .Values.ingress.annotations }}
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annotations:
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{{- toYaml . | nindent 4 }}
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{{- end }}
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spec:
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{{- if .Values.ingress.tls }}
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tls:
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{{- range .Values.ingress.tls }}
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- hosts:
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{{- range .hosts }}
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- {{ . | quote }}
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{{- end }}
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secretName: {{ .secretName }}
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{{- end }}
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{{- end }}
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rules:
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{{- range .Values.ingress.hosts }}
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- host: {{ . | quote }}
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http:
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paths:
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{{- range $ingressPaths }}
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- path: {{ . }}
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backend:
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serviceName: {{ $fullName }}
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servicePort: http
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{{- end }}
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{{- end }}
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{{- end }}

‎samples/python/getting-started/webfrontend/webfrontend/templates/service.yaml

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apiVersion: v1
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kind: Service
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metadata:
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name: {{ include "webfrontend.fullname" . }}
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labels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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helm.sh/chart: {{ include "webfrontend.chart" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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app.kubernetes.io/managed-by: {{ .Release.Service }}
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spec:
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type: {{ .Values.service.type }}
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ports:
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- port: {{ .Values.service.port }}
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targetPort: http
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protocol: TCP
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name: http
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selector:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}

‎samples/python/getting-started/webfrontend/webfrontend/templates/tests/test-connection.yaml

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apiVersion: v1
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kind: Pod
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metadata:
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name: "{{ include "webfrontend.fullname" . }}-test-connection"
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labels:
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app.kubernetes.io/name: {{ include "webfrontend.name" . }}
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helm.sh/chart: {{ include "webfrontend.chart" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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app.kubernetes.io/managed-by: {{ .Release.Service }}
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annotations:
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"helm.sh/hook": test-success
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spec:
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containers:
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- name: wget
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image: busybox
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command: ['wget']
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args: ['{{ include "webfrontend.fullname" . }}:{{ .Values.service.port }}']
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restartPolicy: Never

‎samples/python/getting-started/webfrontend/webfrontend/values.yaml

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# Default values for webfrontend.
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# This is a YAML-formatted file.
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# Declare variables to be passed into your templates.
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replicaCount: 1
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image:
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repository: azds-webfrontend-python
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tag: stable
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pullPolicy: IfNotPresent
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nameOverride: ""
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fullnameOverride: ""
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service:
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type: LoadBalancer
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port: 80
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ingress:
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enabled: true
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annotations: {}
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# kubernetes.io/ingress.class: nginx
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# kubernetes.io/tls-acme: "true"
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paths: ["/"]
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hosts:
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- webfrontend.local
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tls: []
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# - secretName: chart-example-tls
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# hosts:
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# - chart-example.local
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resources: {}
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# We usually recommend not to specify default resources and to leave this as a conscious
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# choice for the user. This also increases chances charts run on environments with little
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# resources, such as Minikube. If you do want to specify resources, uncomment the following
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# lines, adjust them as necessary, and remove the curly braces after 'resources:'.
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# limits:
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# cpu: 100m
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# memory: 128Mi
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# requests:
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# cpu: 100m
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# memory: 128Mi
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nodeSelector: {}
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tolerations: []
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affinity: {}

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