springcloud eureka集羣使用

爲了防止eureka單機宕機出現問題,保證服務發現的高可用,這裏用兩個eureka來實現服務發現的高可用.

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.1.8.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.eew</groupId>
   <artifactId>eureka1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>eureka1</name>
   <description>Demo project for Spring Boot</description>
   <properties>
      <java.version>1.8</java.version>
      <spring-cloud.version>Greenwich.SR3</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-server</artifactId>
      </dependency>
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
      </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>
啓動類的代碼如下

@SpringBootApplication
@EnableEurekaServer
public class Eureka1Application {

   public static void main(String[] args) {
      SpringApplication.run(Eureka1Application.class, args);
   }

}

配置文件的代碼如下:

server:
  port: 9601
eureka:
  instance:
    hostname: localhost1  #localhost2
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost1:9602/eureka/
spring:
    application:
        name: eureka

這裏測試使用的是一個機器兩個eureka 端口號分別是 9601,9602,要注意 用9601的時候註冊的時候端口號用9602,反之相反就好.如下面這個樣子

    defaultZone: http://localhost1:9602/eureka/

 

配置完成後,分別啓動兩個eureka,啓動第一個的時候會報錯,是應該第二個沒有啓動連接不上,第二個啓動後就沒有問題了.