The library hostpolicy.dll was not found

Question

I have a simple .NET Core project (console app) that I\'m trying to compile and run. dotnet build succeeds, but I get the following error when I do dotnet

Answer 1

In my case it was because I was publishing a self-contained application for the wrong target. My intent was to run on alpine linux, but I was building for libc when I should have been building for musl.

The failing package was built using:

dotnet publish --self-contained true --runtime linux-x64 --framework netcoreapp2.1 --output /app

Changing the RID:

dotnet publish --self-contained true --runtime linux-musl-x64 --framework netcoreapp2.1 --output /app

produced a functional package. Notice the RID changed from linux-x64 to linux-musl-x64. If I had read the .NET Core RID Catalog page this could have been avoided.