前提条件

完成vpce接入。

背景信息

Jaeger是Uber推出的一款开源分布式追踪系统，兼容OpenTracing API，已在Uber大规模使用，且已加入CNCF开源组织。其主要功能是聚合来自各个异构系统的实时监控数据。

接入步骤

1、安装依赖包

dotnet add  package Jaeger
dotnet add  package OpenTracing
dotnet add  package OpenTracing.Contrib.NetCore

2、查看接入点信息

应用列表的接入指引会根据您所在资源池提供“通过 HTTP 上报数据”的ENDPOINT(天翼云vpc网络接入点)、鉴权TOKEN信息。

3、初始化SDK并设置exporters

新建文件JaegerServiceCollectionExtensions.cs，代码如下

using System;
using System.Reflection;
using Jaeger;
using Jaeger.Reporters;
using Jaeger.Samplers;
using Jaeger.Senders.Thrift;
using Microsoft.Extensions.Logging;
using OpenTracing;
using OpenTracing.Contrib.NetCore.Configuration;
using OpenTracing.Util;


namespace Microsoft.Extensions.DependencyInjection
{
    public static class JaegerServiceCollectionExtensions
    {
        private static readonly Uri _jaegerUri = new Uri("endpoint"); //替换为上报数据的Endpoint

        public static IServiceCollection AddJaeger(this IServiceCollection services)
        {
            if (services == null)
                throw new ArgumentNullException(nameof(services));

            services.AddSingleton<ITracer>(serviceProvider =>
            {
                var serviceName = "";    //修改为自定义的服务名

                //ILoggerFactory loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();

                var loggerFactory = LoggerFactory.Create(builder =>  
                {  
                    // 添加控制台日志提供程序  
                    builder.AddConsole();  
                    // （可选）其他配置，例如设置日志级别  
                    // builder.SetMinimumLevel(LogLevel.Debug);  
                });

                ISampler sampler = new ConstSampler(sample: true);

                
                //将token替换为自己的鉴权token
                IReporter reporter = new RemoteReporter.Builder()
                    .WithSender(new HttpSender.Builder(_jaegerUri.ToString()).WithAuth("token").Build())
                    .Build();

               
                //IReporter reporter = new LoggingReporter(loggerFactory);
               
                ITracer tracer = new Tracer.Builder(serviceName)
                    .WithLoggerFactory(loggerFactory)
                    .WithSampler(sampler)
                    .WithReporter(reporter)
                    .Build();

                GlobalTracer.Register(tracer);

                return tracer;
            });

            // Prevent endless loops when OpenTracing is tracking HTTP requests to Jaeger.
            services.Configure<HttpHandlerDiagnosticOptions>(options =>
            {
                options.IgnorePatterns.Add(request => _jaegerUri.IsBaseOf(request.RequestUri));
            });
           

            return services;
        }
    }
}

4、开启链路跟踪

using Jaeger;
using Jaeger.Reporters;
using Jaeger.Samplers;
using Microsoft.Extensions.Logging;


var builder = WebApplication.CreateBuilder(args);

builder.Services.AddJaeger();        //ITracer对象的初始化和注册
builder.Services.AddOpenTracing();   //开启Http链路

builder.Services.AddControllers();

var app = builder.Build();

app.MapControllers();

app.Run();