Zookeeper如何实现分布式服务配置中心详解 Zookeeper如何实现分布式服务配

1 Linux安装并启动Zookeeper

1.1 安装

1.1.1 安装

1.2 启动

3 Spring Boot配置

3.1 依赖

3.2 配置文件

3.3 项目代码

3.4 启动测试

总结

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.gzhsperfdata_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.xsllog4j.propertieszoo_sample.cfg[root@iZ1608aqb7ntn9Z conf]# cp zoo_sample.cfg zoo.cfg[root@iZ1608aqb7ntn9Z conf]# lsconfiguration.xsllog4j.propertieszoo.cfgzoo_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]# lsbinconfdatadocslibLICENSE.txtNOTICE.txtREADME.mdREADME_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：

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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)
【Zookeeper如何实现分布式服务配置中心详解】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.bootspring-boot-starter-weborg.springframework.cloudspring-cloud-starter-zookeeper-discovery2.1.4.RELEASEpomruntimeorg.springframework.cloudspring-cloud-starter-zookeeper-config2.1.4.RELEASEpomruntime

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

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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.namels Created /config/hello/student.name[zk: localhost:2181(CONNECTED) 12] get /config/hello/student.name ls

重新启动项目：