deploy-to-existing-kubernetes-cluster.yml

# 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:
- main

resources:
- repo: self

variables:

  # Container registry service connection established during pipeline creation
  dockerRegistryServiceConnection: '{{ containerRegistryConnection.Id }}'
  imageRepository: '{{#toAlphaNumericString imageRepository 50}}{{/toAlphaNumericString}}'
  containerRegistry: '{{ containerRegistryConnection.Authorization.Parameters.loginServer }}'
  dockerfilePath: '**/Dockerfile'
  tag: '$(Build.BuildId)'
  imagePullSecret: '{{#toAlphaNumericString containerRegistryConnection.Name 50}}{{/toAlphaNumericString}}{{#shortGuid}}{{/shortGuid}}-auth'

  # Agent VM image name
  vmImageName: 'ubuntu-latest'
  
  {{#if reviewApp}}
  # Name of the new namespace being created to deploy the PR changes.
  k8sNamespaceForPR: 'review-app-$(System.PullRequest.PullRequestId)'
  {{/if}}

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
    {{#if reviewApp}}
    condition: and(succeeded(), not(startsWith(variables['Build.SourceBranch'], 'refs/pull/')))
    {{/if}}
    displayName: Deploy
    pool:
      vmImage: $(vmImageName)
    environment: '{{ k8sResource.EnvironmentReference.Name }}.{{ k8sResource.Name }}'
    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)

{{#if reviewApp}}
  - deployment: DeployPullRequest
    displayName: Deploy Pull request
    condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/pull/'))
    pool:
      vmImage: $(vmImageName)
      
    environment: '{{ k8sResource.EnvironmentReference.Name }}.$(k8sNamespaceForPR)'
    strategy:
      runOnce:
        deploy:
          steps:
          - reviewApp: {{ k8sResource.Name }}

          - 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"
{{/if}}