詳解通過docker和docker-compose實現eureka高可用

2024-09-01 13:55:37

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最近新項目有使用到springcloud 和docker，關于這兩個技術就不分別介紹了，現在分享一下通過docker,docker-compose實現eureka高可用的方案。

1. eureka server項目目錄結構：

docker,docker-compose,eureka,高可用

2. eureka 配置文件配置：

server: port: 8900spring: application:  name: eureka-server profiles:  active: devmanagement: security:  enabled: false health:  rabbit:   enabled: false---spring: profiles: deveureka: client:  serviceUrl:   defaultZone: http://localhost:${server.port}/eureka/  register-with-eureka: false  fetch-registry: false instance:  hostname: localhost  prefer-ip-address: true---spring: profiles: test_ha_1eureka: client:  serviceUrl:   defaultZone: http://eurekaserver2:${server.port}/eureka/ instance:  hostname: eurekaserver1#  prefer-ip-address: true 該配置為true表示注冊到eureka上的是IP，如果這樣的化，eureka服務器就不能通過服務器發現Replicas。#               故如果想通過Docker實現eureka高可用，該配置最好使用默認值（false）#               此處配置為true且實現高可用也不是沒有辦法，就是每個eureka服務需映射到Docker環境外，且知道ip。---spring: profiles: test_ha_2eureka: client:  serviceUrl:   defaultZone: http://eurekaserver1:${server.port}/eureka/ instance:  hostname: eurekaserver2#  prefer-ip-address: true

3. docker maven插件配置：

 <build>    <plugins>      <plugin>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-maven-plugin</artifactId>      </plugin>      <plugin>        <groupId>com.spotify</groupId>        <artifactId>docker-maven-plugin</artifactId>        <version>0.4.13</version>        <configuration>          <imageName>${docker.image.prefix}/${project.artifactId}:${project.version}</imageName>          <dockerDirectory>src/main/docker</dockerDirectory>          <forceTags>true</forceTags>          <resources>            <resource>              <targetPath>/</targetPath>              <directory>${project.build.directory}</directory>            </resource>          </resources>        </configuration>        <!--<groupId>com.spotify</groupId>        <artifactId>docker-maven-plugin</artifactId>        <version>0.4.13</version>        <configuration>          <imageName>itmuch/${project.artifactId}:${project.version}</imageName>          <forceTags>true</forceTags>          <baseImage>java</baseImage>          <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>          <resources>            <resource>              <targetPath>/</targetPath>              <directory>${project.build.directory}</directory>              <include>${project.build.finalName}.jar</include>            </resource>          </resources>        </configuration>-->      </plugin>    </plugins>  </build>

4. Docker file 文件內容：

FROM java:8ADD eureka-server-1.0.0.jar eurekaserver.jarENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/eurekaserver.jar"]

5. 生成 eureka server 鏡像：

通過執行 mvn clean package docker:build 命令，生成eurekaserver鏡像，如下：

docker,docker-compose,eureka,高可用

6. 通過docker-compose 編排：

version: '2'services: eurekaserver1:  image: raynspace/eureka-server:1.0.0  ports:   - "7900:8900"  environment:   - spring.profiles.active=test_ha_1 eurekaserver2:  image: raynspace/eureka-server:1.0.0  #hostname: eurekaserver2  ports:   - "7800:8900"  environment:   - spring.profiles.active=test_ha_2

7. 跳轉至項目目錄下，執行docker-compose up 命令，自動生成eureka server 兩個容器：

docker,docker-compose,eureka,高可用