Zookeeper如何实现分布式服务配置中心

本篇文章为大家展示了Zookeeper如何实现分布式服务配置中心，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

1 Linux安装并启动Zookeeper

1.1 安装

下载链接：https://archive.apache.org/dist/zookeeper/

1.1.1 安装

[root@iZ1608aqb7ntn9Z tmp]# lsapache-zookeeper-3.5.7-bin.tar.gz  hsperfdata_root[root@iZ1608aqb7ntn9Z tmp]# tar -zxvf apache-zookeeper-3.5.7-bin.tar.gz apache-zookeeper-3.5.7-bin/docs/apache-zookeeper-3.5.7-bin/docs/skin/apache-zookeeper-3.5.7-bin/docs/images/......[root@iZ1608aqb7ntn9Z tmp]# mv apache-zookeeper-3.5.7-bin /usr/local/zookeeper[root@iZ1608aqb7ntn9Z tmp]# cd /usr/local/zookeeper[root@iZ1608aqb7ntn9Z zookeeper]# cd conf/[root@iZ1608aqb7ntn9Z conf]# lsconfiguration.xsl  log4j.properties  zoo_sample.cfg[root@iZ1608aqb7ntn9Z conf]# cp zoo_sample.cfg zoo.cfg[root@iZ1608aqb7ntn9Z conf]# lsconfiguration.xsl  log4j.properties  zoo.cfg  zoo_sample.cfg[root@iZ1608aqb7ntn9Z conf]# vim zoo.cfg # 修改zoo.cfg配置文件 内容为：tickTime=2000initLimit=10syncLimit=5dataDir=/usr/local/zookeeper/dataclientPort=2181# 保存退出[root@iZ1608aqb7ntn9Z conf]# cd ..[root@iZ1608aqb7ntn9Z zookeeper]# mkdir data[root@iZ1608aqb7ntn9Z zookeeper]# lsbin  conf  data  docs  lib  LICENSE.txt  NOTICE.txt  README.md  README_packaging.txt

1.2 启动

[root@iZ1608aqb7ntn9Z zookeeper]# cd bin/[root@iZ1608aqb7ntn9Z bin]# ./zkServer start ......[root@iZ1608aqb7ntn9Z bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /usr/local/zookeeper/bin/../conf/zoo.cfgClient port found: 2181. Client address: localhost. Client SSL: false.Error contacting service. It is probably not running.

在上边我们发现了启动错误，查看日志，发现8080端口被占用，通过查阅Zookeeper3.5的官方文档，发现这是Zookeeper3.5的新特性：

所以我们需要再次修改配置文件，修改启动端口：

在配置文件中加入admin.serverPort=8888

然后再次启动，查看状态：

[root@iZ1608aqb7ntn9Z bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /usr/local/zookeeper3.5.7/bin/../conf/zoo.cfgClient port found: 2181. Client address: localhost.Mode: standalone

发现启动成功，接下来我们用客户端链接：

[root@iZ1608aqb7ntn9Z bin]# ./zkCli.sh Connecting to localhost:2181......WatchedEvent state:SyncConnected type:None path:null[zk: localhost:2181(CONNECTING) 0] ls /[zookeeper]

1.3 阿里云安全组放开2181端口

(略)

2 zookeeper配置

[zk: localhost:2181(CONNECTING) 0] ls /[zookeeper][zk: localhost:2181(CONNECTED) 4] create /configCreated /config[zk: localhost:2181(CONNECTED) 6] create /config/hello # config后的名称要与spring.name的名称对应Created /config/hello[zk: localhost:2181(CONNECTED) 7] create /config/hello/student.name zsCreated /config/hello/student.name[zk: localhost:2181(CONNECTED) 8] get /config/hello/student.name zs

3 Spring Boot配置

3.1 依赖

            org.springframework.boot        spring-boot-starter-web                org.springframework.cloud        spring-cloud-starter-zookeeper-discovery        2.1.4.RELEASE        pom        runtime                org.springframework.cloud        spring-cloud-starter-zookeeper-config        2.1.4.RELEASE        pom        runtime    

注意：一定要注意Spring Boot和Spring Cloud的版本对应！

3.2 配置文件

application.yml

server:  port: 0 # 表示随机端口student:  name: 1

bootstrap.yml

spring:  cloud:    zookeeper:      connect-string: 8.131.57.161:2181  # zk服务端地址      enabled: true  # 启动远程配置  application:    name: hello

3.3 项目代码

/** * @desc: 控制器 * @author: YanMingXin * @create: 2021/8/20-16:31 **/@RestControllerpublic class HelloController {    @Value("${student.name}")    private String name;    @RequestMapping("/hello")    public String getName() {        return name;    }}

3.4 启动测试

下面我们来修改下远程配置，看下是不是真的使用了zookeeper的配置文件:

[zk: localhost:2181(CONNECTED) 9] delete /config/hello/student.name [zk: localhost:2181(CONNECTED) 10] get /config/hello/student.name org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /config/hello/student.name[zk: localhost:2181(CONNECTED) 11] create  /config/hello/student.name  ls Created /config/hello/student.name[zk: localhost:2181(CONNECTED) 12] get /config/hello/student.name ls

重新启动项目：

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