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Add multi-architecture support with Docker Buildx #59

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7 changes: 4 additions & 3 deletions StandAlone.NETCoreApp.Local/Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,16 +1,17 @@
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env

@StefH StefH Jun 11, 2026 •
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Can you please keep the Docker file as-is.
And create a new yml + Docker file which uses this new logic to build these special ARM versions?

FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
ARG TARGETARCH

LABEL maintainer="Stef Heyenrath"

WORKDIR /app

# copy csproj and restore as distinct layers
COPY StandAlone.NETCoreApp.csproj ./
RUN dotnet restore
RUN dotnet restore -a $TARGETARCH

# copy everything else and build
COPY *.cs ./
RUN dotnet publish -c Release -r linux-x64 -o out
RUN dotnet publish -c Release -a $TARGETARCH -o out --no-restore

# build runtime image
FROM mcr.microsoft.com/dotnet/aspnet:8.0
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7 changes: 4 additions & 3 deletions StandAlone.NETCoreApp/Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,16 +1,17 @@
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
ARG TARGETARCH

LABEL maintainer="Stef Heyenrath"

WORKDIR /app

# copy csproj and restore as distinct layers
COPY StandAlone.NETCoreApp.csproj ./
RUN dotnet restore
RUN dotnet restore -a $TARGETARCH

# copy everything else and build
COPY *.cs ./
RUN dotnet publish -c Release -r linux-x64 -o out
RUN dotnet publish -c Release -a $TARGETARCH -o out --no-restore

# build runtime image
FROM mcr.microsoft.com/dotnet/aspnet:8.0
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50 changes: 19 additions & 31 deletions azure-pipelines.yml
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Expand Up @@ -7,39 +7,27 @@ variables:
trigger: none

pool:
vmImage: 'Ubuntu-latest'
vmImage: 'ubuntu-latest'

steps:
- task: UseDotNet@2
inputs:
packageType: 'sdk'
version: 8.0.x

- task: DotNetCoreCLI@2
displayName: Build StandAlone.NETCoreApp
inputs:
command: 'build'
arguments: /p:Configuration=$(buildConfiguration)
projects: $(buildProjects)

- task: Docker@2
displayName: 'Build Docker [$(imageName)(latest,$(tag)]'
displayName: Login to registry
inputs:
command: 'build'
containerRegistry: 'DockerRegistry'
repository: '$(DOCKER_ID)/$(imageName)'
dockerfile: '$(Build.SourcesDirectory)/StandAlone.NETCoreApp/Dockerfile'
tags: |
$(tag)
latest
command: login
containerRegistry: DockerRegistry

- task: Docker@2
displayName: 'Push Docker [$(imageName)(latest,$(tag)]'
inputs:
command: 'push'
containerRegistry: 'DockerRegistry'
repository: '$(DOCKER_ID)/$(imageName)'
dockerfile: '$(Build.SourcesDirectory)/StandAlone.NETCoreApp/Dockerfile'
tags: |
$(tag)
latest
- script: |
docker run --privileged --rm tonistiigi/binfmt --install all
docker buildx create --use --name builder
docker buildx inspect --bootstrap
displayName: Set up Docker buildx

- script: |
docker buildx build \
--platform linux/amd64,linux/arm64,linux/arm/v7 \
--tag $(DOCKER_ID)/$(imageName):$(tag) \
--tag $(DOCKER_ID)/$(imageName):latest \
--file $(Build.SourcesDirectory)/StandAlone.NETCoreApp/Dockerfile \
$(Build.SourcesDirectory)/StandAlone.NETCoreApp \
--push
displayName: 'Build multi-arch Docker image [$(imageName)(latest,$(tag)]'