在Docker内部使用System.Drawing [英] Using System.Drawing inside Docker
问题描述
我已按照以下步骤操作：
I have followed these steps:
-
创建一个没有Docker支持的新ASP.NET Core MVC Web应用程序
Create a new ASP.NET Core MVC web application without Docker support
安装了 System.Drawing.Common Nuget软件包
Installed the System.Drawing.Common Nuget packages
添加一个名为 TestImage.png
使用以下命令成功访问文件代码：
Access the file successfully using the following code:
byte[] imageLoaded = System.IO.File.ReadAllBytes("TestImage.png");
Image image;
using (MemoryStream mStream = new MemoryStream(imageLoaded))
{
image = Image.FromStream(mStream);
}
var image2 = new Bitmap(image);
image2.Save("TestImage1.png", ImageFormat.Png);
到目前为止的预期行为；这是有问题的位：
Expected behaviour up to now; here is the problematic bit:
右键单击解决方案，然后选择：添加容器编排支持/ Docker Compose / Linux（目标操作系统）
Right click on the solution and select: Add Container Orchestration Support/Docker Compose/Linux (target OS)
运行项目（docker-compose是启动项目）。我收到一个错误：
Run the project (docker-compose is the startup project). I get an error:
DllNotFoundException：无法加载共享库'libdl'或其依赖项之一。为了帮助诊断加载问题，请考虑设置LD_DEBUG环境变量：liblibdl：无法打开共享对象文件：没有这样的文件或目录
DllNotFoundException: Unable to load shared library 'libdl' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibdl: cannot open shared object file: No such file or directory
我做了很多Google搜索，发现了以下内容：在AWS Lambda上使用System.Drawing.Common NuGet软件包时无法加载DLL'libdl'
I have done a lot of Googling and found this: Unable to load DLL 'libdl' when using System.Drawing.Common NuGet package on AWS Lambda
这是我的Dockerfile：
Here is my Dockerfile:
FROM microsoft/dotnet:2.2-aspnetcore-runtime AS base
WORKDIR /app
EXPOSE 80
FROM microsoft/dotnet:2.2-sdk AS build
WORKDIR /src
COPY WebApplication1/WebApplication1.csproj WebApplication1/
RUN dotnet restore WebApplication1/WebApplication1.csproj
COPY . .
WORKDIR /src/WebApplication1
RUN dotnet build WebApplication1.csproj -c Release -o /app
FROM build AS publish
RUN dotnet publish WebApplication1.csproj -c Release -o /app
FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "WebApplication1.dll"]
我尝试添加以下行：
# install System.Drawing native dependencies
RUN apt-get update \
&& apt-get install -y --allow-unauthenticated \
libc6-dev \
libgdiplus \
libx11-dev \
&& rm -rf /var/lib/apt/lists/*
但是，这没有什么区别。我怎样才能解决这个问题？还是有另一种无需使用System.Drawing.Common即可解决此问题的方法。
However, it has made no difference. How can I fix this? or Is there another way I can approach this without using System.Drawing.Common.
但是，它没有用。我该如何解决这个问题？
However, it has not worked. How can I fix this?
或者，有一种方法可以编码该代码以避免system.drawing？
Alternatively, is there a way to code this avoiding system.drawing?
推荐答案
我设法使它起作用。
这是我的dockerfile的样子：
I have managed to make this to work. This is how my dockerfile looks like:
（我使用的是.net core 3.0，但在2.x版本中应该可以正常工作）
(I'm using .net core 3.0 but it should work perfectly fine with 2.x versions)
FROM mcr.microsoft.com/dotnet/core/aspnet:3.0-buster-slim AS base
RUN apt-get update \
&& apt-get install -y --no-install-recommends libgdiplus libc6-dev \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/*
RUN cd /usr/lib && ln -s libgdiplus.so gdiplus.dll
WORKDIR /app
... the rest of your dockerfile ...
我希望这会有所帮助。
这篇关于在Docker内部使用System.Drawing的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
