Hi
I have an ASP.NET Core application running in Docker on my Raspberry Pi (arm64
). This is the Dockerfile
:
ARG BASE_IMAGE=mcr.microsoft.com/dotnet/aspnet:7.0-bullseye-slim-arm64v8
FROM ${BASE_IMAGE} AS base
WORKDIR /app
FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /src
COPY ["src/ScreenshotCreator.Api/ScreenshotCreator.Api.csproj", "src/ScreenshotCreator.Api/"]
COPY ["src/ScreenshotCreator.Logic/ScreenshotCreator.Logic.csproj", "src/ScreenshotCreator.Logic/"]
RUN dotnet restore "src/ScreenshotCreator.Api/ScreenshotCreator.Api.csproj"
COPY . .
WORKDIR "/src/src/ScreenshotCreator.Api"
RUN dotnet build "ScreenshotCreator.Api.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "ScreenshotCreator.Api.csproj" -c Release -o /app/publish /p:UseAppHost=false
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
RUN apt-get update
RUN apt-get install -y wget libssl1.1 libunwind8
RUN mkdir -p /opt/microsoft/powershell/7
RUN wget -O /tmp/powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v7.2.6/powershell-7.2.6-linux-arm64.tar.gz
RUN tar zxf /tmp/powershell.tar.gz -C /opt/microsoft/powershell/7
RUN chmod +x /opt/microsoft/powershell/7/pwsh
RUN ln -s /opt/microsoft/powershell/7/pwsh /usr/bin/pwsh
RUN rm /tmp/powershell.tar.gz
RUN ["pwsh", "playwright.ps1", "install", "chromium"]
RUN ["pwsh", "playwright.ps1", "install-deps", "chromium"]
ENTRYPOINT ["dotnet", "ScreenshotCreator.Api.dll"]
When trying to build and run this Docker container on my Windows machine (amd64
, Docker via WSL2 (Ubuntu)), it fails because a) the base image is not correct and b) the bunch of RUN
statements for installing PowerShell at the end have to look different depending on the platform:
# Install PWSH on Raspberry
# https://learn.microsoft.com/en-us/powershell/scripting/install/install-raspbian?view=powershell-7.3#install-on-raspberry-pi-os
sudo apt-get update
sudo apt-get install '^libssl1.0.[0-9]$' libunwind8 -y
wget https://github.com/PowerShell/PowerShell/releases/download/v7.3.4/powershell-7.3.4-linux-arm64.tar.gz
mkdir ~/powershell
tar -xvf ./powershell-7.3.4-linux-arm32.tar.gz -C ~/powershell
~/powershell/pwsh
# Install PWSH on Ubuntu (WSL2/Docker)
# https://learn.microsoft.com/en-us/powershell/scripting/install/install-ubuntu?view=powershell-7.3#installation-via-package-repository
sudo apt-get update
sudo apt-get install -y wget apt-transport-https software-properties-common
wget -q "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb"
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install -y powershell
pwsh
I solved problem a with the variable BASE_IMAGE
that I set override locally, but I’m not sure how to handle b. What’s the recommended pattern for this using Docker?
- Maintain two different
Dockerfile
s (arm64
/Raspi andamd64
/Ubuntu/WSL) and swallow the bitter pill of duplicating the first half of theDockerfile
. - Using some sort of conditional
RUN
statement so that there is only onlyDockerfile
, looking like this:
ARG BASE_IMAGE=mcr.microsoft.com/dotnet/aspnet:7.0-bullseye-slim-arm64v8
FROM ${BASE_IMAGE} AS base
WORKDIR /app
FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /src
COPY ["src/ScreenshotCreator.Api/ScreenshotCreator.Api.csproj", "src/ScreenshotCreator.Api/"]
COPY ["src/ScreenshotCreator.Logic/ScreenshotCreator.Logic.csproj", "src/ScreenshotCreator.Logic/"]
RUN dotnet restore "src/ScreenshotCreator.Api/ScreenshotCreator.Api.csproj"
COPY . .
WORKDIR "/src/src/ScreenshotCreator.Api"
RUN dotnet build "ScreenshotCreator.Api.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "ScreenshotCreator.Api.csproj" -c Release -o /app/publish /p:UseAppHost=false
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
if ${PLATFORM}=="arm":
RUN apt-get update
RUN apt-get install -y wget libssl1.1 libunwind8
RUN mkdir -p /opt/microsoft/powershell/7
RUN wget -O /tmp/powershell.tar.gz https://github.com/PowerShell/PowerShell/releases/download/v7.2.6/powershell-7.2.6-linux-arm64.tar.gz
RUN tar zxf /tmp/powershell.tar.gz -C /opt/microsoft/powershell/7
RUN chmod +x /opt/microsoft/powershell/7/pwsh
RUN ln -s /opt/microsoft/powershell/7/pwsh /usr/bin/pwsh
RUN rm /tmp/powershell.tar.gz
RUN ["pwsh", "playwright.ps1", "install", "chromium"]
RUN ["pwsh", "playwright.ps1", "install-deps", "chromium"]
else
RUN apt-get update
RUN apt-get install -y wget apt-transport-https software-properties-common
RUN wget -q https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb
RUN dpkg -i packages-microsoft-prod.deb
RUN apt-get update
RUN apt-get install -y powershell
RUN ["pwsh", "playwright.ps1" ,"install", "chromium"]
RUN ["pwsh", "playwright.ps1" ,"install-deps", "chromium"]
ENTRYPOINT ["dotnet", "ScreenshotCreator.Api.dll"]
Thank you for your help!