Distributed Tracing

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Distributed Tracing

In the Kubernetes/OpenShift world, the de-facto standard for distributed tracing through microservices is OpenTracing and Jaeger. Jaeger and OpenTracing are available as libraries for ASP.NET applications as well.

1. Install the OpenTracing package

   cd <solution root>/src/RedHat.TodoList
   dotnet add package OpenTracing.Contrib.NetCore
   dotnet add package Jaeger.Core

2. Enable OpenTracing in your Startup.cs file as follows:

      public void ConfigureServices(IServiceCollection services)
      {
   
         // Add framework services.
         services.AddOpenTracing();
         // Adds the Jaeger Tracer.
         services.AddSingleton<ITracer>(serviceProvider =>
         {
            string serviceName = serviceProvider.GetRequiredService<IWebHostEnvironment>().ApplicationName;
   
            // This will log to a default localhost installation of Jaeger.
            var tracer = new Tracer.Builder(serviceName)
               .WithSampler(new ConstSampler(true))
               .Build();
   
            // Allows code that can't use DI to also access the tracer.
            GlobalTracer.Register(tracer);
   
            return tracer;
         });

3. Now, you can use Environment Variables or settings in appsettings.json to configure where to send the tracing data