Am I running .NET 8 or .NET 6 in my Azure App Service

Question

Hi

I have just upgraded one of our APIs from .NET 6 to .NET 8.

Everything runs, everything looks good, but I had a few issues to start with.

Now, to verify a few things, I used Kudu to confirm the .NET version was correct.

When using SSH and running dotnet --list-runtime-versions I see the expected

root@03d47a33f421:~/site/wwwroot# dotnet --list-runtimes

Microsoft.AspNetCore.App 8.0.7 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]

Microsoft.NETCore.App 8.0.7 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

When using Bash and running the same dotnet --list-runtime-versions I see .NET 6

root@03d47a33f421:~/site/wwwroot# dotnet --list-runtimes

Microsoft.AspNetCore.App 8.0.7 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]

Microsoft.NETCore.App 8.0.7 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

So the question...

Which runtime version am I actually using?

Is my API successfully upgraded and running .NET 8?

Kind regards

Rich

Answer 1

Please check the App Service's .Net Version in Settings --> Configuration --> General Settings --> .Net Version. Ensure .Net 8 is selected as the configuration if not please select .Net 8 here.

Also Enable Application logging and see the application logs to confirm the runtime version of the app.

Answer 2

As the runtimes install side by side, it’s the apps target runtime at build that determines the version of .net runtime required. If you deployed a .net 8 app, it would not run if .net 8 was not installed, unless you also included runtime in the deployment. Alternatively if you deployed a .net 6 app, it still requires .net 6 runtime and will not use .net 8 runtime if installed.