Zookeeper如何实现分布式服务配置中心详解
作者：扯编程的淡
Zookeeper在实际使用场景很多,比如配置中心,分布式锁,注册中心等,下面这篇文章主要给大家介绍了关于Zookeeper如何实现分布式服务配置中心的相关资料,需要的朋友可以参考下
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]# ls apache-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]# ls configuration.xsl log4j.properties zoo_sample.cfg [root@iZ1608aqb7ntn9Z conf]# cp zoo_sample.cfg zoo.cfg [root@iZ1608aqb7ntn9Z conf]# ls configuration.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=2000 initLimit=10 syncLimit=5 dataDir=/usr/local/zookeeper/data clientPort=2181 # 保存退出 [root@iZ1608aqb7ntn9Z conf]# cd .. [root@iZ1608aqb7ntn9Z zookeeper]# mkdir data [root@iZ1608aqb7ntn9Z zookeeper]# ls bin 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 status ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Client 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 status ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper3.5.7/bin/../conf/zoo.cfg Client 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 /config Created /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 zs Created /config/hello/student.name [zk: localhost:2181(CONNECTED) 8] get /config/hello/student.name zs
3 Spring Boot配置
3.1 依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<version>2.1.4.RELEASE</version>
<type>pom</type>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-config</artifactId>
<version>2.1.4.RELEASE</version>
<type>pom</type>
<scope>runtime</scope>
</dependency>
</dependencies>
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
**/
@RestController
public 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：
总结
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