这篇文章主要介绍 spring cloud consul 组件，它是一个提供服务发现和配置的工具。consul具有分布式、高可用、高扩展性。

一、consul 简介

consul 具有以下性质：

• 服务发现：consul通过http 方式注册服务，并且服务与服务之间相互感应。
• 服务健康监测
• key/value 存储
• 多数据中心

consul可运行在mac windows linux 等机器上。

二、consul安装

linux

$ mkdir -p $GOPATH/src/github.com/hashicorp && cd $!

$ git clone https://github.com/hashicorp/consul.git

$ cd consul

$ make bootstrap

$ make bootstrap

三、构建工程

构建一个consul-miya的springboot工程，导入依赖pring-cloud-starter-consul-discovery，其依赖文件：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.forezp</groupId>

    <artifactId>consul-miya</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>consul-miya</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.2.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-consul-discovery</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>Dalston.RELEASE</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

在其入口文件ConsulMiyaApplication加入注解@EnableDiscoveryClient，开启服务发现：

@SpringBootApplication

@EnableDiscoveryClient

@RestController

public class ConsulMiyaApplication {

    @RequestMapping("/hi")

    public String home() {

        return "hi ,i'm miya";

    }

    public static void main(String[] args) {

        new SpringApplicationBuilder(ConsulMiyaApplication.class).web(true).run(args);

    }

}

在其配置文件application.yml指定consul服务的端口为8500：

spring:

  cloud:

    consul:

      host: localhost

      port: 8500

      discovery:

        healthCheckPath: ${management.contextPath}/health

        healthCheckInterval: 15s

        instance-id: consul-miya

  application:

    name: consul-miya

server:

  port: 8502

启动工程，访问localhost:8500,可以发现consul-miya被注册了。