Azure Devops Pipeline Docker Build

Question

my question is how to build a docker in the build pipeline with different environments depending on the pull request/branch. I use .net6 and Key Vault + Variable Groups. As I know when the docker builds the image he uses appsetings.json. If I don't want to pass prod settings to this file and I want to override or somehow give settings from Variable Groups to the Docker file or is there another way to make this?

trigger:
    - main
    - test
    - development
    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)
              latest

Bright Ran-MSFT · Accepted Answer · 2022-11-24T07:00:46.293

You can conditionally assign value to the variable in YAML pipeline.

For example, suppose there are 4 Docker registry service connections to 4 different Docker registries (Registry01, Registry02, Registry03 and Registry04), and 3 branches (main, test and development) in the Git repository.

The targets are:

When the build is run for main branch, the Docker images need to be built and pushed to Registry01.
When the build is run for test branch, the Docker images need to be built and pushed to Registry02.
When the build is run for development branch, the Docker images need to be built and pushed to Registry03.
When the build is run for a pull request, the Docker images need to be built and pushed to Registry04.

We can configure the YAML pipeline like as below:

trigger:
  branches:
    include:
    - main
    - test
    - development

variables:
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/main') }}:
    dockerRegistryServiceConnection: 'Registry01'
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/test') }}:
    dockerRegistryServiceConnection: 'Registry02'
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/development') }}:
    dockerRegistryServiceConnection: 'Registry03'
  ${{ if contains(variables['Build.SourceBranch'], 'refs/pull/') }}:
    dockerRegistryServiceConnection: 'Registry04'

stages:
- stage: Build
  displayName: 'Build stage'
  jobs:
  - job: Build
    displayName: 'Build job'
    pool:
      vmImage: windows-latest
    steps:
    - task: Docker@2
      displayName: 'Build and push an image to container registry'
      inputs:
        command: buildAndPush
        repository: $(imageRepository)
        Dockerfile: $(dockerfilePath)
        containerRegistry: $(dockerRegistryServiceConnection)
        tags: |
          $(tag)
          latest

For the values of other input parameters (repository, Dockerfile, tags, etc..) on the Docker task, you can use the same method to conditionally assign their values. And you also can conditionally assign the vmImage of the agent you want to use to run the build job.

For example.

variables:
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/main') }}:
    vmImageName: 'windows-latest'
    dockerRegistryServiceConnection: 'Registry01'
    imageRepository： 'repository01'
    dockerfilePath: 'Dockerfile01'
    tag: 'tag01'
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/test') }}:
    vmImageName: 'windows-2019'
    dockerRegistryServiceConnection: 'Registry02'
    imageRepository： 'repository02'
    dockerfilePath: 'Dockerfile02'
    tag: 'tag02'
  ${{ if eq(variables['Build.SourceBranch'], 'refs/heads/development') }}:
    vmImageName: 'ubuntu-latest'
    dockerRegistryServiceConnection: 'Registry03'
    imageRepository： 'repository03'
    dockerfilePath: 'Dockerfile03'
    tag: 'tag03'
  ${{ if contains(variables['Build.SourceBranch'], 'refs/pull/') }}:
    vmImageName: 'macOS-latest'
    dockerRegistryServiceConnection: 'Registry04'
    imageRepository： 'repository04'
    dockerfilePath: 'Dockerfile04'
    tag: 'tag04'

Azure Devops Pipeline Docker Build

1 Answers1