ASPNETCORE_ENVIRONMENT
是一个环境变量,用于指定 ASP.NET Core 应用程序的运行环境(如 Development、Staging、Production 等)。这个变量可以影响应用程序的行为,例如日志记录级别、配置文件的加载等。
在 Docker 容器中无法获取 ASPNETCORE_ENVIRONMENT
变量的常见原因包括:
在 Dockerfile 中使用 ENV
指令来设置环境变量:
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["YourProject.csproj", "./"]
RUN dotnet restore
COPY . .
RUN dotnet build -c Release -o /app/build
FROM build AS publish
RUN dotnet publish -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV ASPNETCORE_ENVIRONMENT=Development
ENTRYPOINT ["dotnet", "YourProject.dll"]
在 docker-compose.yml
文件中使用 environment
指令来设置环境变量:
version: '3.4'
services:
web:
image: yourproject
build:
context: .
dockerfile: Dockerfile
ports:
- "80:80"
environment:
- ASPNETCORE_ENVIRONMENT=Development
确保你的 ASP.NET Core 应用程序能够正确读取环境变量。例如,在 appsettings.json
中使用环境变量:
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
"ConnectionStrings": {
"DefaultConnection": "Server=localhost;Database=YourDatabase;User Id=YourUser;Password=YourPassword;"
},
"FeatureFlags": {
"EnableNewFeature": "${ASPNETCORE_ENVIRONMENT:Production} == 'Development'"
}
}
ASPNETCORE_ENVIRONMENT
变量在以下场景中非常有用:
通过以上方法,你应该能够在 Docker 容器中正确设置和获取 ASPNETCORE_ENVIRONMENT
环境变量。
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