Automating Azure Service App Deployment with Azure DevOps Pipelines

Divyank Soni
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Introduction

In modern software development, Continuous Integration and Continuous Deployment (CI/CD) are crucial in ensuring smooth, automated deployments. Azure DevOps provides robust pipeline capabilities that enable developers to automate the deployment of their applications, reducing manual effort and minimizing errors.

In this blog, we’ll walk through setting up an Azure DevOps pipeline for an Azure Service App, ensuring seamless deployment whenever changes are pushed to the repository.

Setting Up the Azure DevOps Pipeline

Before diving into the pipeline configuration, ensure you have.

An Azure Service App created in the Azure Portal.
A service connection in Azure DevOps is linked to your Azure subscription.
Your Service App code is stored in a repository like Azure Repos, GitHub, or Bitbucket.

Pipeline Configuration

Below is a YAML-based Azure DevOps pipeline that automates the build and deployment of an Azure Service App.

trigger:
  branches:
    include:
      - main # Change this to your branch if needed
  paths:
    include:
      - ServiceAppCode/*

variables:
  azureSubscription: 'ServiceAppDeployment' # Azure service connection name
  serviceAppName: 'TestingApp' # Azure Service App name
  serviceAppPath: 'ServiceAppCode' # Path to Service App source code
  buildConfiguration: 'Release' # Build service app source code in release
  publishDirectory: '$(Build.ArtifactStagingDirectory)/publish'

pool:
  vmImage: 'ubuntu-22.04' # Also use ubuntu-latest

stages:
  - stage: Build
    displayName: 'Build Stage'
    jobs:
      - job: Build
        displayName: 'Build Job'
        steps:
          - task: UseDotNet@2
            displayName: 'Install .NET SDK'
            inputs:
              packageType: 'sdk'
              version: '8.0.x'
              includePreviewVersions: false

          - script: |
              echo "Cleaning up existing publish directory..."
              rm -rf $(publishDirectory)
              mkdir -p $(publishDirectory)
            displayName: 'Ensure Clean Publish Directory'

          - task: DotNetCoreCLI@2
            displayName: 'Restore Dependencies'
            inputs:
              command: 'restore'
              projects: '$(serviceAppPath)/*.csproj'

          - task: DotNetCoreCLI@2
            displayName: 'Build Service App'
            inputs:
              command: 'build'
              projects: '$(serviceAppPath)/*.csproj'
              arguments: '--configuration $(buildConfiguration) /p:WarningLevel=0' # Remove warnings during build

          - task: DotNetCoreCLI@2
            displayName: 'Publish Service App'
            inputs:
              command: 'publish'
              projects: '$(serviceAppPath)/*.csproj'
              publishWebProjects: false
              arguments: '--configuration $(buildConfiguration) --output $(publishDirectory)'
              zipAfterPublish: true

          - task: PublishBuildArtifacts@1
            displayName: 'Publish Artifacts'
            inputs:
              pathToPublish: '$(publishDirectory)'
              artifactName: 'drop'

  - stage: Deploy
    displayName: 'Deploy Stage'
    dependsOn: Build
    condition: succeeded()
    jobs:
      - job: Deploy
        displayName: 'Deploy to Azure Service App'
        steps:
          - download: current
            displayName: 'Download Build Artifacts'
            artifact: 'drop'

          - task: AzureServiceApp@1
            displayName: 'Deploy to Azure Service App'
            inputs:
              azureSubscription: '$(azureSubscription)'
              appType: 'webApp' # functionApp for function app OR webApp for service app
              appName: '$(serviceAppName)'
              package: '$(Pipeline.Workspace)/drop/*.zip'

Understanding the Pipeline

1. Trigger Configuration

The pipeline is triggered when changes are pushed to the main branch.
It monitors specific folders where Service App updates are made.

2. Defining Variables

azureSubscription: The name of the Azure DevOps service connection.
serviceAppName: The name of the Service App in Azure.
serviceAppPath: The directory containing the Service App source code.
publishDirectory: The folder where the build output is stored.

3. Choosing the Right Agent Pool

The pipeline uses the Ubuntu 22.04 VM image for the build process

4. Build Stage

Installing .NET SDK: This ensures that the required version is available.
Cleaning the Publish Directory: This prevents old files from interfering with new builds.
Restoring Dependencies: Ensures that all NuGet dependencies are downloaded.
Building the Service App: Compiles the service app with the specified configuration.
Publishing the Service App: Packages the compiled app for deployment.
Publishing Artifacts: Stores the published files as build artifacts for the deployment stage.

5. Deploy Stage

Downloading Build Artifacts: Retrieves the published application files.
Deploying to Azure: Uses the AzureServiceApp@1 task to deploy the service app to Azure.