DinkToPDF working on local but not on the server

Question

I am running a dotnet core 3.1 app, and I am using the DinkToPdf package for the necessary reports. When I try convert I get the following error when I click on the button that calls the conversion message.

An error occured while trying to generate the report.
System.AggregateException: One or more errors occurred. (Unable to load shared library 'libwkhtmltox' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibwkhtmltox: cannot open shared object file: No such file or directory)
 ---> System.DllNotFoundException: Unable to load shared library 'libwkhtmltox' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibwkhtmltox: cannot open shared object file: No such file or directory
   at DinkToPdf.WkHtmlToXBindings.wkhtmltopdf_init(Int32 useGraphics)
   at DinkToPdf.PdfTools.Load()
   at DinkToPdf.BasicConverter.Convert(IDocument document)
   at DinkToPdf.SynchronizedConverter.<>n__0(IDocument document)
   at DinkToPdf.SynchronizedConverter.<>c__DisplayClass5_0.<Convert>b__0()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of inner exception stack trace ---
   at DinkToPdf.SynchronizedConverter.Invoke[TResult](Func`1 delegate)
   at DinkToPdf.SynchronizedConverter.Convert(IDocument document)
   at WEBelieve.Application.WebApi.Controllers.PortalController.AppReportController.GenerateReportFromHtmlStringV2(String html) in /App/Controllers/PortalController/AppReportController.cs:line 668
   at WEBelieve.Application.WebApi.Controllers.PortalController.AppReportController.GenerateJobDescriptionReport3(ReportViewModel reportViewModel) in /App/Controllers/PortalController/AppReportController.cs:line 615

My dockerfile is

# Build stage
FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
WORKDIR /App

# Copy everything
COPY . ./
# Restore as distinct layers
RUN dotnet restore
# Build and publish a release
RUN dotnet publish -c Release -o out

# Runtime image
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1
WORKDIR /App
COPY --from=build-env /App/out .

# Set environment variables
ENV ASPNETCORE_URLS=http://0.0.0.0:5000
ENV ASPNETCORE_ENVIRONMENT=Development

# Expose ports
EXPOSE 80
EXPOSE 5000
EXPOSE 5001

# Start the application
ENTRYPOINT ["dotnet", "WEBelieve.Application.WebApi.dll"]

I have the dll and all the other dependendencies in my root folder enter image description here

It works when I run the app locally (running the app through the dotnet run with all settings) but when I run it through the server, either from the docker container or on stage and production. When I look into the files on the docker server container, the libwkhtmltox.dll, libwkhtmltox.dylib, and libwkhtmltox.so are in the /App directory.

I tried to update the redistribution by adding the following to my docker file

# Install the latest version of Visual C++ Redistributable
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    libc6 \
    && rm -rf /var/lib/apt/lists/*

and I still got the same error.

I have this is my .csproj file

<None Update="libwkhtmltox.dll">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
    <None Update="libwkhtmltox.dylib">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
    <None Update="libwkhtmltox.so">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>

Do you have any suggestions I could try with this?

Answer 1

# Install libwkhtmltox dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        zlib1g \
        fontconfig \
        libfreetype6 \
        libx11-6 \
        libxext6 \
        libxrender1 \
        libjpeg62-turbo

This is what fixed the problem in the end