Spring Cloud Eureka学习笔记

其他 2019-01-09 22:45:16 阅读次数: 0
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

  1. Eureka Server 注册中心
  2. 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

在这里插入图片描述

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:

在这里插入图片描述

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

在这里插入图片描述

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

在这里插入图片描述

Eureka Server 高可用

双节点注册中心

在这里插入图片描述

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

在这里插入图片描述

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

  1. 客户端发现
    • Eureka
  2. 服务端发现
    • nginx
    • zookeeper
    • kubernetes

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