添加Serilog.AspNetCore后无法在Docker容器中运行.NET6应用

解决方案 #

修改Dockerfile中的基础镜像，将mcr.microsoft.com/dotnet/runtime:6.0替换为mcr.microsoft.com/dotnet/aspnet:6.0。

修改后的完整Dockerfile如下：

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["ProjectA/ProjectA.csproj", "ProjectA/"]
COPY ["ProjectB/ProjectB.csproj", "ProjectB/"]
COPY ["ProjectC/ProjectC.csproj", "ProjectC/"]
RUN dotnet restore "ProjectA/ProjectA.csproj"
COPY . .
WORKDIR "/src/ProjectA"
RUN dotnet build "ProjectA.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "ProjectA.csproj" -c Release -o /app/publish /p:UseAppHost=false

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "ProjectA.dll"]

原因分析 #

Serilog.AspNetCore v6.1.0包依赖ASP.NET Core运行时框架（Microsoft.AspNetCore.App），但你原Dockerfile使用的dotnet/runtime:6.0镜像仅包含.NET基础运行时，不包含ASP.NET Core的专属组件，因此容器启动时无法找到所需框架，触发报错。

移除该包后，应用不再依赖ASP.NET Core运行时，仅靠基础runtime镜像即可满足运行需求，因此能正常启动。

内容的提问来源于stack exchange，提问作者Vinit Divekar