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consul集群搭建和springboot服务发现

由于系统准备重构库存模块，以微服务的方式处理出入库和库存占用情况。但是单个服务容易宕机导致整个应用中断，所以需要用consul做服务注册和发现防止单点故障。

1. 准备3台centos7的虚拟机

• 192.168.5.211
• 192.168.2.60
• 192.168.2.61

2. 3台虚拟机安装consul

yum install -y yum-utils
yum-config-manager --add-repo https://rpm.releases.hashicorp.com/RHEL/hashicorp.repo
yum -y install consul
consul --version

3. 3台机器关闭防火墙

systemctl firewalld stop

4. 建立集群,分别在ip上执行

consul agent -server -bootstrap-expect=3 -data-dir=/tmp/consul -config-file=/usr/src/consul -node=192.168.5.211 -bind=0.0.0.0 -client=0.0.0.0 -ui  -rejoin
consul agent -server -bootstrap-expect=3 -data-dir=/tmp/consul -config-file=/usr/src/consul -node=192.168.2.61 -bind=0.0.0.0 -client=0.0.0.0 -ui -rejoin -join=192.168.5.211
consul agent -server -bootstrap-expect=3 -data-dir=/tmp/consul -config-file=/usr/src/consul -node=192.168.2.60 -bind=0.0.0.0 -client=0.0.0.0 -ui  -rejoin -join=192.168.5.211

如果需要添加client，执行如下代码

consul agent -data-dir=/tmp/consul -config-file=/usr/src/consul -node=192.168.2.85 -bind=0.0.0.0 -client=0.0.0.0 -ui -join=192.168.5.211
consul agent -data-dir=/tmp/consul -config-file=/usr/src/consul -node=192.168.2.89 -bind=0.0.0.0 -client=0.0.0.0 -ui -join=192.168.5.211

然后访问 http://192.168.5.211:8500/

5. springboot建立空项目

添加依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <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>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
              <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

添加配置文件 application.properties

spring.application.name=consul-springboot-demo
server.port=18888
spring.cloud.consul.discovery.enabled=true
spring.cloud.consul.host=192.168.5.211
spring.cloud.consul.port=8500
#spring.cloud.consul.discovery.health-check-path=/health
#spring.cloud.consul.discovery.health-check-interval=15s
spring.cloud.consul.discovery.hostname=demo
spring.cloud.consul.discovery.register-health-check=true
spring.cloud.consul.discovery.prefer-ip-address=true

spring.cloud.consul.discovery.ip-address=192.168.2.127

6. 启动springboot项目，然后登录http://192.168.5.211:8500/在service下面即可看到注册的服务。