A tiny snippet of what I'm trying to do. Full code is here: https://github.com/NuGet/NuGetGallery/tree/anurse/v3-jobs/src/Services and kinda complicated ;P

JobsService.cs

public class JobsService : NuGetService {
  // .. stuff!
  
  protected override Task<bool> OnStart() {
    // Here, Container is the "scope" passed in to service.Initialize above.
    Jobs = Container.Resolve<IEnumerable<JobDefinition>>();
    // *** KA BOOM! Exception trying to construct a JobDefinition (when it's not designed to be constructed by Autofac) ***
  }
  
  public override void RegisterComponents(ContainerBuilder builder)
  {
    base.RegisterComponents(builder);

    var jobdefs = typeof(JobsWorkerRole)
      .Assembly
      .GetExportedTypes()
      .Where(t => !t.IsAbstract && typeof(JobBase).IsAssignableFrom(t))
      .Select(t => new JobDefinition(JobDescription.Create(t), t))
      .Where(d => d.Description != null);
    foreach (var jobdef in jobdefs)
    {
        builder.RegisterInstance(jobdef).As<JobDefinition>();
    }
  }
}

ServiceHost.cs

public class ServiceHost
{
  // ... bunch-o-stuff ...
  async Task<NuGetService> StartService(NuGetService service) {
    // .. some stuff ..
    
    ILifetimeScope scope = _container.BeginLifetimeScope(builder =>
    {
      builder.RegisterInstance(service)
       .As<NuGetService>()
       .As(service.GetType());

      // Add the container itself to the container
      builder.Register(c => scope)
        .As<ILifetimeScope>()
        .SingleInstance();
      builder.Register(c => c.Resolve<ILifetimeScope>() as IComponentContainer)
        .As<IComponentContainer>()
        .As<IServiceProvider>()
        .SingleInstance();

      // Add components provided by the service
      service.RegisterComponents(builder);
    });
    // .. more stuff
    service.Initialize(scope);
    // .. even more stuff
  }
}