安装Zookeeper服务

Vmware安装CentOS7

建议zookeeper安装到Linux系统，本地可使用虚拟机代替，虚拟机安装CentOS7可于此文查看: VMware 安装 CentOS 7，安装好虚拟机后，假设虚拟机ip为192.168.115.50(宿主机可以ping通虚拟机)，且建立了用户app。

CentOS7里安装Zookeeper3.4.9(需要Java环境)

下载地址
下载后上传到CentOS7，解压到/home/app/soft目录下
进入目录/home/app/soft/zookeeper-3.4.9/conf
将zoo_sample.cfg文件复制一份并重命名为zoo.cfg
进入目录/home/app/soft/zookeeper-3.4.9/bin，执行下方命令来启动zookeeper服务

# 启动服务 2181端口
sh zkServer.sh start

# 检查是否启动成功
sh zkServer.sh status

至此，宿主机应该可以在192.168.115.50:2181访问到zookeeper

集群

关于zookeeper集群，网上有很多教程，这里不赘述

服务提供者模块(ms-provider-zookeeper)

模块搭建

基于Zookeeper的服务提供者模块搭建方法与基于Eureka客户端的搭建方法类似，区别是基于Eureka客户端服务提供者需要在启动类声明@EnableEurekaClient，基于zookeeper的不需要；并且两者依赖有些不同

在根项目pom.xml的modules标签下加入模块 ms-provider-zookeeper
在项目根目录建立 ms-provider-zookeeper 目录，并在ms-provider-zookeeper目录下建立pom.xml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>
    <parent>
        <groupId>com.spz.demo</groupId>
        <artifactId>spring-cloud-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>ms-provider-zookeeper</artifactId>
    <packaging>jar</packaging>

    <description>服务提供者模块 - 使用zookeeper注册中心</description>

    <dependencies>

        <!-- Zookeeper注册中心 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Zookeeper 3.4.9 -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- sleuth zipkin 服务追踪 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>com.spz.demo</groupId>
            <artifactId>api-common</artifactId>
            <version>${project.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

</project>

建立src/main/java和src/main/resources目录
在src/main/java目录下建立包com.spz.demo.scloud.provider.zk
在zk包下建立SpringBoot启动类 ProviderZookeeperApp.java

package com.spz.demo.scloud.provider.zk;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * 启动类
 * @author spzmmd
 * @createTime 2021/04/08
 */
@EnableDiscoveryClient
@SpringBootApplication
public class ProviderZookeeperApp {
    public static void main(String[] args) {
        SpringApplication.run(ProviderZookeeperApp.class, args);
    }
}

AppServiceImpl类和IndexController类与前文基于Eureka客户端的服务提供者相关代码相同，请查看前文，不同的是com.spz.demo.scloud.provider.zk.service.AppServiceImpl#instanceNameAndPort方法返回值里可以添加一句": (基于Zookeeper注册中心)"来便于测试
在src/main/resources目录下建立application.properties文件

server.port=8001
spring.application.name=MS-PROVIDER-ZOOKEEPER

spring.cloud.zookeeper.connect-string=192.168.115.50:2181

集群部署

与前文基于Eureka客户端的服务提供者部署方法一致，修改idea启动配置，设置vm options，加入下列配置即可

-Dserver.port=8001

服务消费者模块(ms-consumer-zookeeper)

消费者模块搭建方法与前文类似，这里不再赘述，请参考案例项目里的ms-consumer-zookeeper模块，启动ms-provider-zookeeper多节点以及ms-consumer-zookeeper单节点，不断访问下方链接：

http://localhost:7001/discovery/zookeeper/appService/projectInfo

将交替出现8001、8002两个服务提供者端口，证明服务均已成功注册进zookeeper

{
"code": 2000,
"message": "MS-PROVIDER-ZOOKEEPER:8002: (基于Zookeeper注册中心)",
"data": null
}

{
"code": 2000,
"message": "MS-PROVIDER-ZOOKEEPER:8001: (基于Zookeeper注册中心)",
"data": null
}