一： consul 的 配置的有两种方式，这里主要介绍 通过代码 注册服务

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Consul官网：https://www.consul.io/
Consul的主要功能有服务注册与发现、健康检查、K-V存储、多数据中心等。

• Consul安装：很简单，直接在官网下载解压即可。
• Consul运行：在consul.exe目录下打开命令行执行 consul.exe agent -dev
• 浏览器访问：http://localhost:8500/

分别建3个项目  Api.Catalog，Api.Ordering，Provider.Consul

Api.Catalog和Api.Ordering 服务结构 一样，端口可以用不同

using Consul;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Api.Catalog.Helper
{
public static class ConsulHelper
    {
/// 
   /// 服务注册到consul
/// 
   ///    ///    public static IApplicationBuilder RegisterConsul(this IApplicationBuilder app, IConfiguration configuration, IHostApplicationLifetime lifetime) 
        {
var consulClient = new ConsulClient(c =>
            {
//consul地址                c.Address = new Uri(configuration["ConsulSetting:ConsulAddress"]);
            });

var registration = new AgentServiceRegistration()
            {
                ID= Guid.NewGuid().ToString(),//服务实例唯一标识                Name = configuration["ConsulSetting:ServiceName"],//服务名                Address = configuration["ConsulSetting:ServiceIP"], //服务IP                Port = int.Parse(configuration["ConsulSetting:ServicePort"]),//服务端口 因为要运行多个实例，端口不能在appsettings.json里配置，在docker容器运行时传入                Check = new AgentServiceCheck()
                {
                    DeregisterCriticalServiceAfter= TimeSpan.FromSeconds(5),//服务启动多久后注册                    Interval = TimeSpan.FromSeconds(10),//健康检查时间间隔                    HTTP = $"http://{configuration["ConsulSetting:ServiceIP"]}:{configuration["ConsulSetting:ServicePort"]}{configuration["ConsulSetting:ServiceHealthCheck"]}",//健康检查地址                    Timeout = TimeSpan.FromSeconds(5)//等待时间                }
            };

//服务注册            consulClient.Agent.ServiceRegister(registration).Wait();

//应用程序终止时，取消注册            lifetime.ApplicationStopping.Register(() =>
            {
                consulClient.Agent.ServiceDeregister(registration.ID).Wait();
            });

return app;
        }
    }
}

using Microsoft.AspNetCore.Mvc;

namespace Api.Catalog.Controllers
{
    [Route("[controller]")]
    [ApiController]
public class HealthCheckController : ControllerBase
    {
/// 
   /// 健康检查接口
/// 
   ///         [HttpGet]
public IActionResult Get() => Ok();
    }
}

using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;

namespace Api.Catalog.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
public class ValuesController : ControllerBase
    {
        [HttpGet]
public IEnumerable Get()
        {
return new string[] { "Api.Catalog1", "Api.Catalog2" };
        }

        [HttpGet("{id}")]
public string Get(int id)
        {
return "Api.Catalog";
        }
    }
}

{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
    }
  },
"AllowedHosts": "*",
"ConsulSetting": {
"ServiceName": "CatalogService",
"ServiceHealthCheck": "/healthcheck",
"ConsulAddress": "http://localhost:8500", //注意，docker容器内部无法使用localhost访问宿主机器，如果是控制台启动的话就用localhost  "ServiceIP": "localhost",
"ServicePort": 52457
  }
}

Startup.cs

using Api.Catalog.Helper;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Api.Catalog
{
public class Startup
    {
public Startup(IConfiguration configuration)
        {
            Configuration= configuration;
        }

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.   public void ConfigureServices(IServiceCollection services)
        {

            services.AddControllers();
            services.AddSwaggerGen(c=>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "Api.Catalog", Version = "v1" });
            });
        }

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.   public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IHostApplicationLifetime lifetime)
        {
if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c=> c.SwaggerEndpoint("/swagger/v1/swagger.json", "Api.Catalog v1"));
            }

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints=>
            {
                endpoints.MapControllers();
            });

//服务注册            app.RegisterConsul(Configuration, lifetime);
        }
    }
}

Provider.Consul 项目结构

ocelot.json 配置

{
"GlobalConfiguration": {
//Ocelot应用地址  "BaseUrl": "http://localhost:2808",
"ServiceDiscoveryProvider": {
//Consul地址 "Host": "http://localhost/",
//Consul端口 "Port": 8500,
"Type": "Consul" //由Consul提供服务发现，每次请求Consul    }
  },
"Routes": [
    {
"DownstreamPathTemplate": "/api/{everything}",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
        {
"Host": "localhost",
"Port": 52457
        },
        {
"Host": "localhost",
"Port": 41097
        }
      ],
"UpstreamPathTemplate": "/{everything}",
"UpstreamHttpMethod": [ "Get", "Post" ],
"LoadBalancerOptions": {
"Type": "RoundRobin"
      }
    }
  ]
}

Program.cs 配置

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Provider.Consul
{
public class Program
    {
public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration(c=>
            {
                c.AddJsonFile("ocelot.json", optional: false, reloadOnChange: true);
            })
                .ConfigureWebHostDefaults(webBuilder=>
                {
                    webBuilder.UseStartup();
                });
    }
}

Startup.cs 代码

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using Ocelot.DependencyInjection;
using Ocelot.Middleware;
using Ocelot.Provider.Consul;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Provider.Consul
{
public class Startup
    {
public Startup(IConfiguration configuration)
        {
            Configuration= configuration;
        }

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.   public void ConfigureServices(IServiceCollection services)
        {
            services.AddOcelot().AddConsul();//注入Ocelot服务            services.AddControllers();
        }

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.   public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseOcelot();

            app.UseAuthorization();

            app.UseEndpoints(endpoints=>
            {
                endpoints.MapControllers();
            });
        }
    }
}

运行后的效果

参考地址：https://www.cnblogs.com/xhznl/p/13091750.html

网页名称：微服务Consul代码dome-创新互联
标题来源：http://lszwz.com/article/deccsc.html