Nacos 致力于帮助您发现、配置和管理微服务。Nacos 提供了一组简单易用的特性集,帮助您快速实现动态服务发现、服务配置、服务元数据及流量管理。 是Spring Cloud A 中的服务注册发现组件,类似于Consul、Eureka,同时它又提供了分布式配置中心的功能,这点和Consul的config类似,支持热加载。
1.1、Nacos 的关键特性
- 服务发现和服务健康监测
- 动态配置服务,带管理界面,支持丰富的配置维度。
- 动态 DNS 服务
- 服务及其元数据管理
1.2、Nacos下载和安装
下载地址:https://github.com/alibaba/nacos/releases
下载完成后,解压,在解压后的文件的/bin目录下,windows系统点击startup.cmd就可以启动nacos。linux或mac执行以下命令启动nacos:
sh startup.sh -m standalone
启动成功,在浏览器上访问:http://localhost:8848/nacos,会跳转到登陆界面,默认的登陆用户名为nacos,密码也为nacos。
登陆成功后,展示的界面如下:
2、使用Nacos服务注册和发现
2.1、 Idea-New Project-Maven
一直Next-Finish,然后删除不必要的src,且添加:
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<packaging>pom</packaging>
2.2、选中项目New——Model-Spring Initializr
然后删除不必要的src。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.steven</groupId>
<artifactId>springcloudalibaba</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.steven</groupId>
<artifactId>nacos-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>nacos-server</name>
<description>spring nacos server</description>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<exclusions>
<exclusion>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
再在外层的父pom.xml添加:
<modules>
<module>nacos-server</module>
</modules>
2.3、 父pom.xml添加相关配置
父pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.steven</groupId>
<artifactId>springcloudalibaba</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>nacos-server</module>
</modules>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>8</java.version>
<spring-boot-dependencies.version>2.1.12.RELEASE</spring-boot-dependencies.version>
<spring-cloud-dependencies.version>Greenwich.SR5</spring-cloud-dependencies.version>
<spring-cloud-alibaba-dependencies.version>2.1.1.RELEASE</spring-cloud-alibaba-dependencies.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot-dependencies.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud-dependencies.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>${spring-cloud-alibaba-dependencies.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot-dependencies.version}</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
2.4、在工程的配置文件application.yml做相关的配置,配置如下
server:
port: 8090
spring:
application:
name: nacos-provider
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
2.5、然后在Spring Boot的启动文件NacosProviderApplication加上@EnableDiscoveryClient注解:
@EnableDiscoveryClient
@SpringBootApplication
public class NacosProviderApplication {
public static void main(String[] args) {
SpringApplication.run(NacosProviderApplication.class, args);
}
}