注册中心类似于通讯录，可以查找到服务和服务地址的映射关系
一、安装jdk1.8
yum install java-1.8.0-openjdk.x86_64 -y
#yum方式安装没有配置JAVA_HOME环境变量
cat>>/etc/profile<<EOF
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
EOF
source /etc/profile
二、安装参考官方文档
nacos下载稳定版：
https://github.com/alibaba/nacos/releases
#解压
unzip nacos-server-1.1.0.zip -d/usr/local/ && cd /usr/local/nacos/bin
#启动单机模式
sh startup.sh -m standalone
[root@nacos bin]# sh startup.sh -m standalone
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/bin/java -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Djava.ext.dirs=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/jre/lib/ext:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/lib/ext:/usr/local/nacos/plugins/cmdb:/usr/local/nacos/plugins/mysql -Xloggc:/usr/local/nacos/logs/nacos_gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M -Dnacos.home=/usr/local/nacos -Dloader.path=/usr/local/nacos/plugins/health -jar /usr/local/nacos/target/nacos-server.jar --spring.config.location=classpath:/,classpath:/config/,file:./,file:./config/,file:/usr/local/nacos/conf/ --logging.config=/usr/local/nacos/conf/nacos-logback.xml --server.max-http-header-size=524288
nacos is starting with standalone
nacos is starting，you can check the /usr/local/nacos/logs/start.out
服务注册&发现和配置管理
1、服务注册
curl -X POST 'http://127.0.0.1:8848/nacos/v1/ns/instance?serviceName=nacos.naming.serviceName&ip=20.18.7.10&port=8080'
返回ok
2、服务发现
curl -X GET 'http://127.0.0.1:8848/nacos/v1/ns/instance/list?serviceName=nacos.naming.serviceName'
返回{"metadata":{},"dom":"nacos.naming.serviceName","cacheMillis":3000,"useSpecifiedURL":false,"hosts":[],"name":"DEFAULT_GROUP@@nacos.naming.serviceName","checksum":"a07d4655e7caf8a6aa987662a6179ad2","lastRefTime":1575104879006,"env":"","clusters":""}
3、发布配置
curl -X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataId&group=test&content=HelloWorld"
返回true
4、获取配置
curl -X GET "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataId&group=test"
返回HelloWorld
关闭服务器
sh /usr/local/nacos/bin/shutdown.sh
三、访问nacos图形界面（默认安装）
http://ip:8848/nacos/
默认账号密码nacos/nacos
java示例代码
/*
* Demo for Nacos
* pom.xml
<dependency>
<groupId>com.alibaba.nacos</groupId>
<artifactId>nacos-client</artifactId>
<version>${version}</version>
</dependency>
*/
package com.alibaba.nacos.example;
import java.util.Properties;
import java.util.concurrent.Executor;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;
/**
* Config service example
*
* @author Nacos
*
*/
public class ConfigExample {
public static void main(String[] args) throws NacosException, InterruptedException {
String serverAddr = "localhost";
String dataId = "nacos.cfg.dataId";
String group = "test";
Properties properties = new Properties();
properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);
ConfigService configService = NacosFactory.createConfigService(properties);
String content = configService.getConfig(dataId, group, 5000);
System.out.println(content);
configService.addListener(dataId, group, new Listener() {
@Override
public void receiveConfigInfo(String configInfo) {
System.out.println("recieve:" + configInfo);
}
@Override
public Executor getExecutor() {
return null;
}
});
boolean isPublishOk = configService.publishConfig(dataId, group, "content");
System.out.println(isPublishOk);
Thread.sleep(3000);
content = configService.getConfig(dataId, group, 5000);
System.out.println(content);
boolean isRemoveOk = configService.removeConfig(dataId, group);
System.out.println(isRemoveOk);
Thread.sleep(3000);
content = configService.getConfig(dataId, group, 5000);
System.out.println(content);
Thread.sleep(300000);
}
}
