Azure DevOps - Azure Pipeline with Docker (dotnet)

Build a Docker Image

1. Create an Azure Container registry (say myreg101).

2. Create a Dotnet app (I am using webapp aspnet core 6.0)

3. Publish the code on your local system.

4. Create an azure ubuntu vm and copy-publish code on this machine.

5. Install Docker on ubuntu VM (apt install docker.io -y)

6. Create a Dockerfile in the publish folder with the following code

    

FROM mcr.microsoft.com/dotnet/aspnet:6.0

WORKDIR /app

COPY . .

EXPOSE 80

ENTRYPOINT ["dotnet", "DotNetApp.dll" ]

7. Build a docker image(webimg) with the following command

    docker build . -t webimg

8. Once the image is built successfully then create a container with this image with port forwarding of port number 80.

    docker container run -it --name web -p 80:80 -d webimg

9. On the browser with the public IP address of the ubuntu VM you can see the output of the application.

10. Push the docker image to the container registry with the following commands (myreg101.azurecr.io is the azure container registry server in my case)

        docker login myreg101.azurecr.io

        docker image tag webimg myreg101.azurecr.io/mynginx

        docker push myreg101.azurecr.io/webimg

11. In VS project add a Docker file

12. Create an Azure Pipeline with above project and add below pipeline

# Docker

# Build and push an image to Azure Container Registry

# https://docs.microsoft.com/azure/devops/pipelines/languages/docker

trigger:

- master

resources:

- repo: self

variables:

  # Container registry service connection established during pipeline creation

  dockerRegistryServiceConnection: 'dd082128-b9c9-4f1e-9f55-6035ec616d54'

  imageRepository: 'testproj'

  containerRegistry: 'myreg101.azurecr.io'

  dockerfilePath: '$(Build.SourcesDirectory)/DotNetApp/Dockerfile'

  tag: '$(Build.BuildId)'

  # Agent VM image name

  vmImageName: 'ubuntu-latest'

stages:

- stage: Build

  displayName: Build and push stage

  jobs:

  - job: Build

    displayName: Build

    pool:

      vmImage: $(vmImageName)

    steps:

    - task: UseDotNet@2

      inputs:

        packageType: sdk

        version: '6.x'

    - task: DotNetCoreCLI@2

      inputs:

        command: 'build'

        projects: '**/*.csproj'

        arguments: '--configuration $(buildConfiguration)'

    - task: DotNetCoreCLI@2

      inputs:

        command: 'publish'

        publishWebProjects: true

        arguments: '--configuration $(buildConfiguration) --output $(Build.ArtifactStagingDirectory)'    

    - task: Docker@2

      displayName: Build and push an image to container registry

      inputs:

        command: buildAndPush

        buildContext: $(Build.Repository.LocalPath)

        repository: $(imageRepository)

        dockerfile: $(dockerfilePath)

        containerRegistry: $(dockerRegistryServiceConnection)

        tags: |

          $(tag)

latest

13.Run the pipeline and a docker image should be created in Azure container registry.

14. Create a release pipeline for docker container.

     In the Agent job Use Azure CLI and write an Inline script

     az container create -g MyRG --name appinstance200130 --cpu 1 --memory 1 --port 80 --ip-address Public --image myreg101.azurecr.io/mynginx --registry-username myreg101 --registry-password waJ3dncLQE4jDLolaa9hVvUmeoSMwIS/

15. Container instance should be created