版权声明:嘟嘟嘟,转发记得提一下 https://blog.csdn.net/ticktak/article/details/82958456
用于服务的注册于发现
由两个组件组成
- Eureka Server 注册中心
- Eureka Client 服务注册
Eureka Server(服务注册中心)
先创建一个springboot项目,添加依赖的时候选择如下
pom文件如下
<?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.cloud</groupId>
<artifactId>eureka</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>eureka</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
添加@EnableEurekaServer注解,启动一个服务注册中心提供给其他应用进行对话
@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}
除此之外还需要添加配置文件
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
#由于注册中心会将自己作为客户端尝试注册自己,关闭客户端注册行为
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
server:
port: 8761
运行后,访问http://localhost:8761/可以看到如下页面:
Eureka Client 服务提供方
同样,先创建一个springboot项目,添加依赖的时候选择
pom文件如下,注意添加web的依赖,默认是没有添加的
<?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.cloud</groupId>
<artifactId>client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>client</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
同样添加@EnableDiscoveryClient注解
@SpringBootApplication
@EnableDiscoveryClient
public class ClientApplication {
public static void main(String[] args) {
SpringApplication.run(ClientApplication.class, args);
}
}
添加配置文件
eureka:
client:
service-url:
#指定注册中心的地址
defaultZone: http://localhost:8761/eureka/
# instance:
# hostname: clientname
spring:
application:
name: client
运行项目,在之前的Eureka页面可以看到,服务被注册进来了
Eureka Server 高可用
双节点注册中心
两个Eureka注册中心互相注册,client在两个注册中心都进行注册
配置文件如下:
Eureka1:
eureka:
client:
service-url:
defaultZone: http://localhost:8762/eureka/
#不让eureka出现在注册中心
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
Eureka2:
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
#不让eureka出现在注册中心
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
client:
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/
# instance:
# hostname: clientname
spring:
application:
name: client
启动Eureka1,Eureka2,再启动client一段时间之后,client的服务会注册到两个注册中心
三节点注册中心
同上,三个Eureka两两注册,client同时注册三个
Eureka1:
eureka:
client:
service-url:
defaultZone: http://localhost:8762/eureka/, http://localhost:8763/eureka/
#不让eureka出现在注册中心
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
Eureka2:
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/, http://localhost:8763/eureka/
#不让eureka出现在注册中心
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
Eureka3:
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/, http://localhost:8762/eureka/
#不让eureka出现在注册中心
register-with-eureka: false
#eureka的自我保护(只在开发环境关闭)
server:
enable-self-preservation: false
spring:
application:
name: eureka
client:
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/,http://localhost:8763/eureka/
# instance:
# hostname: clientname
spring:
application:
name: client
服务发现的两种方式
- 客户端发现
- Eureka
- 服务端发现
- nginx
- zookeeper
- kubernetes