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
@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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