linux下的Topshelf和.net core

Question

I have a simple application that starts as a service using topshelf and it looks simple:

 HostFactory.Run(x =>
 {
    x.Service<RequestService>();
    x.RunAsLocalSystem();
 });

Well it works, but under windows. When I tried this under Linux I am getting:

Topshelf.Runtime.Windows.WindowsHostEnvironment Error: 0 : Unable to get parent process (ignored), System.DllNotFoundException: Unable to load shared library 'kernel32.dll' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: libkernel32.dll: cannot open shared object file: No such file or directory

Has someone came across this problem? I tried to google it but someone said it works other that it is tool only for windows.

Or maybe there is some other service hoisting framework for .net core?

Answer 1

Assuming that you installed this version of Topshelf - you would notice under dependencies that it doesn't support .NET Core and therefore it will not run under a Linux environment.

It will only run under a Windows environment as you mentioned in your post. kernel32.dll is a Windows dependency that it cannot find, therefore it cannot run.

Answer 2

Topshelf is not cross-platform and so it does not support .Net Core on non-Windows environments, even if it can run in them (at least at the time of writing).

The solution is to change the environment builder. Here is an example from my project, when creating the service:

HostFactory.Run(c =>
{
  // Change Topshelf's environment builder on non-Windows hosts:
  if (
    RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ||
    RuntimeInformation.IsOSPlatform(OSPlatform.Linux)
  )
  {
    c.UseEnvironmentBuilder(
      target => new DotNetCoreEnvironmentBuilder(target)
    );
  }

  c.SetServiceName("SelloutReportingService");
  c.SetDisplayName("Sellout Reporting Service");
  c.SetDescription(
    "A reporting service that does something...");
  c.StartAutomatically();
  c.RunAsNetworkService();
  c.EnableServiceRecovery(
    a => a.RestartService(TimeSpan.FromSeconds(60))
  );
  c.StartAutomatically();
  c.Service<SelloutReportingService>();
});