如何在 .NET Core 应用程序 docker 映像中包含依赖项? [英] How to include dependencies in .NET Core app docker image?

问题描述

我正在尝试构建 .NET Core 应用 docker 映像.但我不知道我应该如何将项目的 NuGet 依赖项放入映像中.

I'm trying to build a .NET Core app docker image. But I can't figure out how I'm supposed to get the project's NuGet dependencies into the image.

为了简单起见，我创建了一个 .NET Core 控制台应用程序:

For simplicity reasons I've create a .NET Core console application:

using System;
using Newtonsoft.Json;

namespace ConsoleCoreTestApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine($"Hello World: {JsonConvert.False}");
        }
    }
}

它只对 Newtonsoft.Json 有一个 NuGet 依赖.当我从 Visual Studio 运行应用程序时，一切正常.

It just has one NuGet dependency on Newtonsoft.Json. When I run the app from Visual Studio, everything works fine.

但是，当我从项目创建 Docker 映像并尝试从那里执行应用程序时，它找不到依赖项:

However, when I create a Docker image from the project and try to execute the app from there, it can't find the dependency:

# dotnet ConsoleCoreTestApp.dll
Error: assembly specified in the dependencies manifest was not found -- package: 'Newtonsoft.Json', version: '9.0.1', path: 'lib/netstandard1.0/Newtonsoft.Json.dll'

这是意料之中的，因为 Newtonsoft.Json.dll 没有被 Visual Studio 复制到输出文件夹.

This is to be expected because Newtonsoft.Json.dll is not being copied by Visual Studio to the output folder.

这是我正在使用的 Dockerfile:

FROM microsoft/dotnet:1.0.0-core
COPY bin/Debug /app

有没有推荐的方法来处理这个问题?

Is there a recommended way of dealing with this problem?

我不想在容器内运行 dotnet restore(因为我不想在每次容器运行时重新下载所有依赖项).

I don't want to run dotnet restore inside of the container (as I don't want to re-download all dependencies everytime the container runs).

我想我可以在 Dockerfile 中添加一个 RUN dotnet restore 条目，但后来我无法使用 microsoft/dotnet:<version>-core 不再作为基本图像.

I guess I could add a RUN dotnet restore entry to the Dockerfile but then I couldn't use microsoft/dotnet:<version>-core as base image anymore.

而且我找不到让 Visual Studio 将所有依赖项复制到输出文件夹中的方法(就像它对常规 .NET Framework 项目所做的那样).

And I couldn't find a way to make Visual Studio copy all dependencies into the output folder (like it does with regular .NET Framework projects).

推荐答案

经过一些阅读，我终于明白了.

After some more reading I finally figured it out.

你运行的不是 dotnet build:

dotnet publish

这会将所有文件(包括依赖项)放在 publish 文件夹中.然后该文件夹可以直接与 microsoft/dotnet:<version>-core 图像一起使用.

This will place all files (including dependencies) in a publish folder. And this folder then can be used directly with a microsoft/dotnet:<version>-core image.

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