docker 文件 arg 变量未传递给 Linux 上的 asp.net 核心答案

【问题标题】：docker file arg variable not passed for asp.net core on linuxdocker 文件 arg 变量未传递给 Linux 上的 asp.net 核心
【发布时间】：2020-10-17 02:43:41
【问题描述】：

我有一个 Asp.Net core 3.1 应用程序，它像这样针对 linux 进行了 dockerized

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base 
ARG BUILD_CONFIGURATION=Release
ENV ASPNETCORE_ENVIRONMENT=Production
ENV DOTNET_USE_POLLING_FILE_WATCHER=true
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY . .
RUN dotnet restore "Api/Authentication/Authentication.csproj"
COPY . .
WORKDIR "/src/Api/Authentication"
RUN dotnet build "Authentication.csproj" -c $BUILD_CONFIGURATION -o /app/build
FROM build AS publish
RUN dotnet publish "Authentication.csproj" -c $BUILD_CONFIGURATION -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Authentication.dll"]

在 Azure Devops 管道中，构建模板如下所示。

但构建失败并显示以下消息

##[错误]命令'/bin/sh -c dotnet build "Authentication.csproj" -c $BUILD_CONFIGURATION -o /app/build' 返回一个非零代码：1

Arg BUILD_CONFIGURATION 似乎不接受来自 devops piplline 的值

【问题讨论】：

标签： docker asp.net-core azure-devops

【解决方案1】：

ARG 指令在定义它的构建阶段结束时超出范围。要在多个阶段中使用 arg，每个阶段都必须包含 ARG 指令。更多信息，可以参考ARG scope

因此，您需要在构建和发布阶段定义 ARG BUILD_CONFIGURATION=Release。

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base 
ARG BUILD_CONFIGURATION=Release
ENV ASPNETCORE_ENVIRONMENT=Production
ENV DOTNET_USE_POLLING_FILE_WATCHER=true
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
ARG BUILD_CONFIGURATION=Release
WORKDIR /src
COPY . .
RUN dotnet restore "Api/Authentication/Authentication.csproj"
COPY . .
WORKDIR "/src/Api/Authentication"
RUN dotnet build "Authentication.csproj" -c $BUILD_CONFIGURATION -o /app/build
FROM build AS publish
ARG BUILD_CONFIGURATION=Release
RUN dotnet publish "Authentication.csproj" -c $BUILD_CONFIGURATION -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Authentication.dll"]

【讨论】：