03Zookeeper服务注册与发现

Remember_Ray

发布于 2020-10-29 11:08:32

3530

发布于 2020-10-29 11:08:32

文章被收录于专栏：Ray学习笔记

Ubuntu 操作

注册中心 Zookeeper

以 Ubuntu 为例，安装 ZooKeeper


您将需要将Zookeeper的最新版本下载到/ opt目录。您可以使用以下命令下载它：

cd /opt

wget https://mirrors.estointernet.in/apache/zookeeper/zookeeper-3.6.2/apache-zookeeper-3.6.2-bin.tar.gz ```

下载完成后，使用以下命令解压缩下载的文件：

tar -xvzf apache-zookeeper-3.6.2-bin.tar.gz

接下来，使用以下命令将提取的目录重命名为zookeeper：

mv apache-zookeeper-3.6.2-bin zookeeper

接下来，使用以下命令更改zookeeper目录的所有权：

chown -R zookeeper:zookeeper /opt/zookeeper

在独立模式下配置ZooKeeper，您将需要创建ZooKeeper配置文件以独立模式设置ZooKeeper。您可以使用以下命令创建它： ``` nano /opt/zookeeper/conf/zoo.cfg

添加以下行： tickTime=2500 dataDir=/zookeeper clientPort=2181 maxClientCnxns=80 ```

启动ZooKeeper服务

``` cd /opt/zookeeper

bin/zkServer.sh start ```

监听ZooKeeper端口2181

ss -ntpl | grep 2181


![](https://gitee.com/qq343509740/BlogPic/raw/master/image/20201015161857.png)

##查看ip ifconfig


![](https://gitee.com/qq343509740/BlogPic/raw/master/image/20201015162150.png)





## 服务提供者 

> 7-cloud-provider-zk-payment8004

### pom

```xml
<?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">
    <parent>
        <artifactId>SpringCloud_H_2020</artifactId>
        <groupId>com.ray</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>7-cloud-provider-payment8004</artifactId>

    <dependencies>
        <dependency><!-- 引用自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.ray</groupId>
            <artifactId>1-cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--SpringBoot整合Zookeeper客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <!--先排除自带的zookeeper3.5.3-->
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加zookeeper3.6.2版本-->
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.6.2</version>
        </dependency>
        <!--热部署-->
        <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>
    </dependencies>


</project>

yml

# 8004 表示注册到 zookeeper 服务器的支持服务提供者端口
server:
  port: 8004

# 服务别名 -- 在注册中心显示的名字(重要)
spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      # zookeeper 服务器 ip + port
      connect-string: 192.168.116.128:2181

main

package com.ray.springcloud;

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

/**
 * @Description:
 * @Author Administrator
 * @Date 2020/10/11 9:19
 * @Version 1.0
 */
@SpringBootApplication
@EnableDiscoveryClient  // 该注解用于向使用 consul 或者 zookeeper 作为注册中心时注册服务
public class PaymentZkMain8004 {

    public static void main(String[] args) {
        SpringApplication.run(PaymentZkMain8004.class, args);
    }
}

controller

package com.ray.springcloud.controller;

import cn.hutool.core.lang.UUID;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Description:
 * @Author Administrator
 * @Date 2020/10/11 9:20
 * @Version 1.0
 */
@Slf4j
@RestController
@RequestMapping(value = "/payment")
public class PaymentZkController {

    @Value("${server.port}")
    private String serverPort;

    @RequestMapping(value = "zk")
    public String zk() {
        return "springCloud with zookeeper: " + serverPort + "\t" + UUID.randomUUID().toString();
    }
}

测试

一、启动项目，查看zookeeper是否注册成功

二、测试接口是否可用

http://localhost:8004/payment/zk

三、关闭8004，观察 zookeeper 服务器

结论：zookeeper 服务节点是临时节点

服务消费者

8-cloud-consumer-zk-order80

pom

<?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">
    <parent>
        <artifactId>SpringCloud_H_2020</artifactId>
        <groupId>com.ray</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>8-cloud-consumer-zk-order80</artifactId>


    <dependencies>
        <dependency><!-- 引用自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.ray</groupId>
            <artifactId>1-cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--SpringBoot整合Zookeeper客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <!--先排除自带的zookeeper-->
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加zookeeper3.6.2版本-->
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.6.2</version>
        </dependency>
        <!--热部署-->
        <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>
    </dependencies>

</project>

yml

# 8004 表示注册到 zookeeper 服务器的支持服务消费者端口
server:
  port: 80

# 服务别名 -- 在注册中心显示的名字(重要)
spring:
  application:
    name: colud-consumer-zk-order
  cloud:
    zookeeper:
      # zookeeper 服务器 ip + port
      connect-string: 192.168.116.128:2181

main

package com.ray.springcloud;

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

/**
 * @Description:
 * @Author Administrator
 * @Date 2020/10/11 9:59
 * @Version 1.0
 */
@SpringBootApplication
@EnableDiscoveryClient // 该注解用于向使用 consul 或者 zookeeper 作为注册中心时注册服务
public class OrderZkMain80 {

    public static void main(String[] args) {
        SpringApplication.run(OrderZkMain80.class, args);
    }
}

config

package com.ray.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @Description: 相当于封装了 HttpClient
 * @Author Ray
 * @Date 2020/10/07 11:40
 * @Version 1.0
 */
@Configuration
public class RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}

controller

package com.ray.springcloud.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @Description:
 * @Author Administrator
 * @Date 2020/10/11 10:01
 * @Version 1.0
 */
@RequestMapping(value = "/consumer")
@RestController
@Slf4j
public class OrderZkController {

    // 与 zookeeper 服务器上面的提供者名称一致
    public static final String INVOKE_URL = "http://cloud-provider-payment";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/payment/zk")
    public String paymentInfo() {
        String result = restTemplate.getForObject(INVOKE_URL + "/payment/zk", String.class);
        return result;
    }
}