Kubernetes devops demo

Dockerfile

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+FROM tiangolo/uwsgi-nginx-flask:python3.6
+RUN pip install redis
+ADD /azure-vote /app

azure-pipelines.yml

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+# Deploy to Azure Kubernetes Service
+# Build and push image to Azure Container Registry; Deploy to Azure Kubernetes Service
+# https://docs.microsoft.com/azure/devops/pipelines/languages/docker
+
+trigger:
+- master
+
+resources:
+- repo: self
+
+variables:
+
+  # Container registry service connection established during pipeline creation
+  dockerRegistryServiceConnection: '540ecf2e-798b-4d1b-b6ec-4b7b846bc760'
+  imageRepository: 'azure-vote-front-devops'
+  containerRegistry: 'acrsea.azurecr.io'
+  dockerfilePath: '**/Dockerfile'
+  tag: '$(Build.BuildId)'
+  imagePullSecret: 'acrsea98100991-auth'
+
+  # Agent VM image name
+  vmImageName: 'ubuntu-latest'
+  
+  # Name of the new namespace being created to deploy the PR changes.
+  k8sNamespaceForPR: 'review-app-$(System.PullRequest.PullRequestId)'
+
+stages:
+- stage: Build
+  displayName: Build stage
+  jobs:  
+  - job: Build
+    displayName: Build
+    pool:
+      vmImage: $(vmImageName)
+    steps:
+    - task: Docker@2
+      displayName: Build and push an image to container registry
+      inputs:
+        command: buildAndPush
+        repository: $(imageRepository)
+        dockerfile: $(dockerfilePath)
+        containerRegistry: $(dockerRegistryServiceConnection)
+        tags: |
+          $(tag)
+          
+    - upload: manifests
+      artifact: manifests
+
+- stage: Deploy
+  displayName: Deploy stage
+  dependsOn: Build
+
+  jobs:
+  - deployment: Deploy
+    condition: and(succeeded(), not(startsWith(variables['Build.SourceBranch'], 'refs/pull/')))
+    displayName: Deploy
+    pool:
+      vmImage: $(vmImageName)
+    environment: 'devopsonazurevotedevops.devops'
+    strategy:
+      runOnce:
+        deploy:
+          steps:
+          - task: KubernetesManifest@0
+            displayName: Create imagePullSecret
+            inputs:
+              action: createSecret
+              secretName: $(imagePullSecret)
+              dockerRegistryEndpoint: $(dockerRegistryServiceConnection)
+              
+          - task: KubernetesManifest@0
+            displayName: Deploy to Kubernetes cluster
+            inputs:
+              action: deploy
+              manifests: |
+                $(Pipeline.Workspace)/manifests/deployment.yml
+                $(Pipeline.Workspace)/manifests/service.yml
+              imagePullSecrets: |
+                $(imagePullSecret)
+              containers: |
+                $(containerRegistry)/$(imageRepository):$(tag)
+
+  - deployment: DeployPullRequest
+    displayName: Deploy Pull request
+    condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/pull/'))
+    pool:
+      vmImage: $(vmImageName)
+      
+    environment: 'devopsonazurevotedevops.$(k8sNamespaceForPR)'
+    strategy:
+      runOnce:
+        deploy:
+          steps:
+          - reviewApp: devops
+
+          - task: Kubernetes@1
+            displayName: 'Create a new namespace for the pull request'
+            inputs:
+              command: apply
+              useConfigurationFile: true
+              inline: '{ "kind": "Namespace", "apiVersion": "v1", "metadata": { "name": "$(k8sNamespaceForPR)" }}'
+
+          - task: KubernetesManifest@0
+            displayName: Create imagePullSecret
+            inputs:
+              action: createSecret
+              secretName: $(imagePullSecret)
+              namespace: $(k8sNamespaceForPR)
+              dockerRegistryEndpoint: $(dockerRegistryServiceConnection)
+          
+          - task: KubernetesManifest@0
+            displayName: Deploy to the new namespace in the Kubernetes cluster
+            inputs:
+              action: deploy
+              namespace: $(k8sNamespaceForPR)
+              manifests: |
+                $(Pipeline.Workspace)/manifests/deployment.yml
+                $(Pipeline.Workspace)/manifests/service.yml
+              imagePullSecrets: |
+                $(imagePullSecret)
+              containers: |
+                $(containerRegistry)/$(imageRepository):$(tag)
+          
+          - task: Kubernetes@1
+            name: get
+            displayName: 'Get services in the new namespace'
+            continueOnError: true
+            inputs:
+              command: get
+              namespace: $(k8sNamespaceForPR)
+              arguments: svc
+              outputFormat: jsonpath='http://{.items[0].status.loadBalancer.ingress[0].ip}:{.items[0].spec.ports[0].port}'
+              
+          # Getting the IP of the deployed service and writing it to a variable for posing comment
+          - script: |
+              url="$(get.KubectlOutput)"
+              message="Your review app has been deployed"
+              if [ ! -z "$url" -a "$url" != "http://:" ] 
+              then
+                message="${message} and is available at $url.<br><br>[Learn More](https://aka.ms/testwithreviewapps) about how to test and provide feedback for the app."
+              fi
+              echo "##vso[task.setvariable variable=GITHUB_COMMENT]$message"

azure-vote/config_file.cfg

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+# UI Configurations
+TITLE = 'Azure Voting App - Azure Devops Pipeline'
+VOTE1VALUE = 'Cats'
+VOTE2VALUE = 'Dogs'
+SHOWHOST = 'false'

azure-vote/main.py

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+from flask import Flask, request, render_template
+import os
+import random
+import redis
+import socket
+import sys
+
+app = Flask(__name__)
+
+# Load configurations from environment or config file
+app.config.from_pyfile('config_file.cfg')
+
+if ("VOTE1VALUE" in os.environ and os.environ['VOTE1VALUE']):
+    button1 = os.environ['VOTE1VALUE']
+else:
+    button1 = app.config['VOTE1VALUE']
+
+if ("VOTE2VALUE" in os.environ and os.environ['VOTE2VALUE']):
+    button2 = os.environ['VOTE2VALUE']
+else:
+    button2 = app.config['VOTE2VALUE']
+
+if ("TITLE" in os.environ and os.environ['TITLE']):
+    title = os.environ['TITLE']
+else:
+    title = app.config['TITLE']
+
+# Redis configurations
+redis_server = os.environ['REDIS']
+
+# Redis Connection
+try:
+    if "REDIS_PWD" in os.environ:
+        r = redis.StrictRedis(host=redis_server,
+                        port=6379,
+                        password=os.environ['REDIS_PWD'])
+    else:
+        r = redis.Redis(redis_server)
+    r.ping()
+except redis.ConnectionError:
+    exit('Failed to connect to Redis, terminating.')
+
+# Change title to host name to demo NLB
+if app.config['SHOWHOST'] == "true":
+    title = socket.gethostname()
+
+# Init Redis
+if not r.get(button1): r.set(button1,0)
+if not r.get(button2): r.set(button2,0)
+
+@app.route('/', methods=['GET', 'POST'])
+def index():
+
+    if request.method == 'GET':
+
+        # Get current values
+        vote1 = r.get(button1).decode('utf-8')
+        vote2 = r.get(button2).decode('utf-8')            
+
+        # Return index with values
+        return render_template("index.html", value1=int(vote1), value2=int(vote2), button1=button1, button2=button2, title=title)
+
+    elif request.method == 'POST':
+
+        if request.form['vote'] == 'reset':
+            
+            # Empty table and return results
+            r.set(button1,0)
+            r.set(button2,0)
+            vote1 = r.get(button1).decode('utf-8')
+            vote2 = r.get(button2).decode('utf-8')
+            return render_template("index.html", value1=int(vote1), value2=int(vote2), button1=button1, button2=button2, title=title)
+        
+        else:
+
+            # Insert vote result into DB
+            vote = request.form['vote']
+            r.incr(vote,1)
+            
+            # Get current values
+            vote1 = r.get(button1).decode('utf-8')
+            vote2 = r.get(button2).decode('utf-8')  
+                
+            # Return results
+            return render_template("index.html", value1=int(vote1), value2=int(vote2), button1=button1, button2=button2, title=title)
+
+if __name__ == "__main__":
+    app.run()

azure-vote/static/default.css

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+body {
+    background-color:#F8F8F8;
+}
+
+div#container {
+    margin-top:5%;
+}
+
+div#space {
+    display:block;
+    margin: 0 auto;
+    width: 500px;
+    height: 10px;
+ 
+}
+
+div#logo {
+    display:block;
+    margin: 0 auto;
+    width: 500px;
+    text-align: center;
+    font-size:30px;
+    font-family:Helvetica;  
+    /*border-bottom: 1px solid black;*/   
+}
+
+div#form {
+    padding: 20px;
+    padding-right: 20px;
+    padding-top: 20px;
+    display:block;
+    margin: 0 auto;
+    width: 500px;
+    text-align: center;
+    font-size:30px;
+    font-family:Helvetica;  
+    border-bottom: 1px solid black;
+    border-top: 1px solid black;
+}
+
+div#results {
+    display:block;
+    margin: 0 auto;
+    width: 500px;
+    text-align: center;
+    font-size:30px;
+    font-family:Helvetica;  
+}
+
+.button {
+    background-color: #4CAF50; /* Green */
+    border: none;
+    color: white;
+    padding: 16px 32px;
+    text-align: center;
+    text-decoration: none;
+    display: inline-block;
+    font-size: 16px;
+    margin: 4px 2px;
+    -webkit-transition-duration: 0.4s; /* Safari */
+    transition-duration: 0.4s;
+    cursor: pointer;
+    width: 250px;
+}
+
+.button1 {
+    background-color: white; 
+    color: black; 
+    border: 2px solid #008CBA;
+}
+
+.button1:hover {
+    background-color: #008CBA;
+    color: white;
+}
+.button2 {
+    background-color: white;
+    color: black;
+    border: 2px solid #555555;
+}
+
+.button2:hover {
+    background-color: #555555;
+    color: white;
+}
+
+.button3 {
+    background-color: white; 
+    color: black; 
+    border: 2px solid #f44336;
+}
+
+.button3:hover {
+    background-color: #f44336;
+    color: white;
+}

azure-vote/templates/index.html

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+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+    <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='default.css') }}">
+    <title>{{title}}</title>
+
+    <script language="JavaScript">
+        function send(form){
+        }
+    </script>
+
+</head>
+<body>
+    <div id="container">
+        <form id="form" name="form" action="/"" method="post"><center>
+        <div id="logo">{{title}}</div>
+        <div id="space"></div>
+        <div id="form">
+        <button name="vote" value="{{button1}}" onclick="send()" class="button button1">{{button1}}</button>
+        <button name="vote" value="{{button2}}" onclick="send()" class="button button2">{{button2}}</button>
+        <button name="vote" value="reset" onclick="send()" class="button button3">Reset</button>
+        <div id="space"></div>
+        <div id="space"></div>
+        <div id="results"> {{button1}} - {{ value1 }} | {{button2}} - {{ value2 }} </div> 
+        </form>        
+        </div>
+    </div>     
+</body>
+</html>

manifests/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: azure-vote-back
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: azure-vote-back
+  template:
+    metadata:
+      labels:
+        app: azure-vote-back
+    spec:
+      nodeSelector:
+        "beta.kubernetes.io/os": linux
+      containers:
+      - name: azure-vote-back
+        image: redis
+        ports:
+        - containerPort: 6379
+          name: redis
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: azure-vote-front
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: azure-vote-front
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+  minReadySeconds: 5 
+  template:
+    metadata:
+      labels:
+        app: azure-vote-front
+    spec:
+      nodeSelector:
+        "beta.kubernetes.io/os": linux
+      containers:
+      - name: azure-vote-front
+        image: acrsea.azurecr.io/azure-vote-front-devops
+        ports:
+        - containerPort: 80
+        resources:
+          requests:
+            cpu: 250m
+          limits:
+            cpu: 500m
+        env:
+        - name: REDIS
+          value: "azure-vote-back"

manifests/service.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: azure-vote-back
+spec:
+  ports:
+  - port: 6379
+  selector:
+    app: azure-vote-back
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: azure-vote-front
+spec:
+  type: LoadBalancer
+  ports:
+  - port: 80
+  selector:
+    app: azure-vote-front