Issue running .NET 8 in Azure App Service running Linux

Question

Just to prefix this with the fact that I have no Linux experience.

I have a .NET WebAPI that I publish to two local folder locations:

1. Windows

• Configuration = Release
• Target Framework = netcoreapp3.1 (I know, it's out of support)
• Deployment Mode: Self-contained
• Target Runtime : win-x64

2. Linux

• Configuration = Release
• Target Framework = netcoreapp3.1 (I know, it's out of support)
• Deployment Mode: Self-contained
• Target Runtime : linux-x64

I first create a Windows App Service (I'm familiar with these) and drop the first set of files into the wwwroot folder and everything works fine.

I then create a Linux App Service, and drop the second set of files into the wwwroot folder and it fails to start.

Going to the "Diagnose and solve problems" pane for the App Service I see it finds my start-up DLL but then says:

Process terminated. Couldn't find a valid ICU package installed on the system. Set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support.

I download the full logs and the logs are all named "docker", but I'm not using a Docker container, so slightly mystified from the get-go.

If I go to the App Service's Advanced Tools and look at the Environment, I see it's using Unix 5.15.131.1 and is 64 bit.

Not sure how to proceed...

UPDATE

This is the csproj file, minus project references to other projects in the Solution.

<Project Sdk="Microsoft.NET.Sdk.Web">

    <PropertyGroup>
        <TargetFramework>netcoreapp3.1</TargetFramework>
        <AssemblyVersion>1.0.0.1</AssemblyVersion>
        <FileVersion>1.0.0.1</FileVersion>
        <UserSecretsId>e593907e-90b3-4395-9cbc-5010001eb07c</UserSecretsId>
        <TypeScriptToolsVersion>Latest</TypeScriptToolsVersion>
        <TypeScriptBuildMode>true</TypeScriptBuildMode>
        <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>
        <!--<InvariantGlobalization>true</InvariantGlobalization>-->
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.Authentication.MicrosoftAccount" Version="3.1.11" />
        <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="3.1.11" />
        <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="5.0.2" />
        <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="3.1.11" />
        <PackageReference Include="Microsoft.AspNetCore.SpaServices" Version="3.1.29" />
        <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="3.1.29" />
        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.2">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.1" />
        <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="5.0.0" />
        <PackageReference Include="Microsoft.Identity.Web" Version="1.5.1" />
        <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="1.5.1" />
        <PackageReference Include="Microsoft.Identity.Web.UI" Version="1.5.1" />
        <PackageReference Include="Microsoft.Owin.Cors" Version="3.1.0" />
        <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.10.9" />
        <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.5" />
        <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
        <PackageReference Include="Swashbuckle.AspNetCore.Swagger" Version="5.6.3" />
        <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="5.6.3" />
        <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="5.6.3" />
    </ItemGroup>

    <ItemGroup>
        <!--  removed project references -->
    </ItemGroup>

</Project>

Answer 1

I have created a configured Web App with your configurations.

Windows Deployment:

Initially I have tried to deploy with Target Runtime : win-x64, but I got the below warning.

So, I have changed the Target Runtime to win-x86 and deployed the App.

I am able to deploy and access the WebApp without any issues.

Linux Deployment:

I am able to deploy with Target Runtime linux-x64 without any issues.

Process terminated. Couldn't find a valid ICU package installed on the system. Set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support.

As mentioned in the MSDoc ,to change the Invariant to true, we need to add the below line in .csproj file.

<PropertyGroup> <InvariantGlobalization>true</InvariantGlobalization> </PropertyGroup>

No usable version of libssl was found.

This type of error usually occurs in older .NET Core Version.

Thanks @Davide for the clear steps.

The better approach is to upgrade to the latest version.

OR

If you are not willing to upgrade the version, Install the OpenSSL package from NuGet Packager Manager/run the command in KUDU Console.

We tried to do a quick upgrade to .Net8.0, but were thwarted by incompatible NuGet packages

Yes, the packages which you have installed are not compatible with the newer .Net8 version. You need to update the packages which are not supported.