这篇文章主要介绍“怎么通过docker和docker-compose实现eureka高可用”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“怎么通过docker和docker-compose实现eureka高可用”文章能帮助大家解决问题。
1. eureka server项目目录结构:
2. eureka 配置文件配置:
server:
port: 8900
spring:
application:
name: eureka-server
profiles:
active: dev
management:
security:
enabled: false
health:
rabbit:
enabled: false
---
spring:
profiles: dev
eureka:
client:
serviceurl:
defaultzone: http://localhost:${server.port}/eureka/
register-with-eureka: false
fetch-registry: false
instance:
hostname: localhost
prefer-ip-address: true
---
spring:
profiles: test_ha_1
eureka:
client:
serviceurl:
defaultzone: http://eurekaserver2:${server.port}/eureka/
instance:
hostname: eurekaserver1
# prefer-ip-address: true 该配置为true表示注册到eureka上的是ip,如果这样的化,eureka服务器就不能通过服务器发现replicas。
# 故如果想通过docker实现eureka高可用,该配置最好使用默认值(false)
# 此处配置为true且实现高可用也不是没有办法,就是每个eureka服务需映射到docker环境外,且知道ip。
---
spring:
profiles: test_ha_2
eureka:
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 文件内容:
from java:8
add eureka-server-1.0.0.jar eurekaserver.jar
entrypoint ["java","-djava.security.egd=file:/dev/./urandom","-jar","/eurekaserver.jar"]
5. 生成 eureka server 镜像:
通过执行 mvn clean package docker:build 命令,生成eurekaserver镜像,如下:
6. 通过docker-compose 编排:
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. 跳转至项目目录下,执行docker-compose up 命令,自动生成eureka server 两个容器:
8. 由于已经把eureka 端口映射出来,所以本地通过端口访问eureka,查看eureka 服务状态:
通过上图可知,在registered-replicas和available-replicas两项均能看见另外一个eureka服务,至此eureka 集群搭建完成。
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