使用场景

使用docker-compose方式部署eureka的服务端和客户端，并使用容器ip进行通信。
原理是使用docker-compose默认在一个网络下，并提供dns下的通过service通信的功能。
该方法也可以用于其它形式的容器内部服务调用的功能实现。

服务端主要代码

pom.xml

4.0.0org.springframework.bootspring-boot-starter-parent2.7.9 com.liuyang.sceurekaserver0.0.1-SNAPSHOTeurekaserverDemo project for Spring Boot1.82021.0.6org.springframework.bootspring-boot-starter-weborg.springframework.cloudspring-cloud-starter-netflix-eureka-serverorg.springframework.bootspring-boot-starter-testtestorg.springframework.cloudspring-cloud-dependencies${spring-cloud.version}pomimportorg.springframework.bootspring-boot-maven-pluginorg.apache.maven.pluginsmaven-resources-plugin2.4.3

application.yml

spring:application:name: eureka-serverserver:port: 29108 #服务注册中心端口号
eureka:instance:hostname: 127.0.0.1 #服务注册中心IP地址client:registerWithEureka: false #是否向服务注册中心注册自己fetchRegistry: false #是否检索服务serviceUrl: #服务注册中心的配置内容，指定服务注册中心的位置defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

main.java

package com.liuyang.sc.eurekaserver;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableEurekaServer
@SpringBootApplication
public class EurekaserverApplication {public static void main(String[] args) {SpringApplication.run(EurekaserverApplication.class, args);}}

客户端主要代码

pom.xml

4.0.0org.springframework.bootspring-boot-starter-parent2.7.9 com.scgateway-project0.0.1-SNAPSHOTgateway-projectDemo project for Spring Boot1.82021.0.6org.springframework.bootspring-boot-starter-webfluxorg.springframework.cloudspring-cloud-starter-gatewayorg.springframework.cloudspring-cloud-starter-netflix-eureka-clientorg.springframework.bootspring-boot-starter-testtestio.projectreactorreactor-testtestorg.springframework.cloudspring-cloud-dependencies${spring-cloud.version}pomimportorg.springframework.bootspring-boot-maven-pluginorg.apache.maven.pluginsmaven-resources-plugin2.4.3

application.yml

spring:application:name: gatewaycloud:gateway:discovery:locator:enabled: trueserver:port: 29107eureka:client:service-url:defaultZone: http://eurekaserver:29108/eureka/  #此处的eurakaserver为docker-compose.yml中eureka-server工程的容器定义instance:prefer-ip-address: true	# 使用IP注册，避免容器id:port调用报错

main.java

package com.sc.gatewayproject;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient
@EnableDiscoveryClient
@SpringBootApplication
public class GatewayProjectApplication {public static void main(String[] args) {SpringApplication.run(GatewayProjectApplication.class, args);}}

粗陋的DockerFile

eurekaserver

FROM java:openjdk-8u111-jdkCOPY eurekaserver-0.0.1-SNAPSHOT.jar app.jarEXPOSE 29108ENTRYPOINT ["java","-Xmx128m","-jar","app.jar"]

gateway

FROM java:openjdk-8u111-jdkCOPY gateway-project-0.0.1-SNAPSHOT.jar app.jarEXPOSE 29107ENTRYPOINT ["java","-Xmx128m","-jar","app.jar"]

docker-compose.yml

version: '2'
services:eurekaserver:			# 注意此处的名称需要添加到eureka客户端的defaultZone中，相当于docker内的主机名#container_name: eureka_serverimage: maojindaobike/eurekaserver:230315ports:- "29108:29108"gateway:#container_name: gatewayimage: maojindaobike/gateway:230316_v5ports:- "29107:29107"depends_on:- eurekaserver

启动

docker-compose up -d

扩容

扩容时，需要显式端口映射，避免端口冲突
docker-compose.yml

version: '3'
services:eurekaserver:#container_name: eureka_serverimage: maojindaobike/eurekaserver:230315ports:- "29108:29108"gateway:#container_name: gatewayimage: maojindaobike/gateway:230316_v5ports:- "29107"depends_on:- eurekaserver

docker-compose up -d
docker-compose up -d --scale gateway=3

docker-compse ps

root@dockerserver:~/springcloud-dockerpose# docker-compose ps
/snap/docker/2746/lib/python3.6/site-packages/paramiko/transport.py:32: CryptographyDeprecationWarning: Python 3.6 is no longer supported by the Python core team. Therefore, support for it is deprecated in cryptography. The next release of cryptography (40.0) will be the last to support Python 3.6.from cryptography.hazmat.backends import default_backendName                             Command             State                      Ports
-------------------------------------------------------------------------------------------------------------------------
springcloud-dockerpose_eurekaserver_1   java -Xmx128m -jar app.jar   Up      0.0.0.0:29108->29108/tcp,:::29108->29108/tcp
springcloud-dockerpose_gateway_1        java -Xmx128m -jar app.jar   Up      0.0.0.0:49154->29107/tcp,:::49154->29107/tcp
springcloud-dockerpose_gateway_2        java -Xmx128m -jar app.jar   Up      0.0.0.0:49156->29107/tcp,:::49156->29107/tcp
springcloud-dockerpose_gateway_3        java -Xmx128m -jar app.jar   Up      0.0.0.0:49155->29107/tcp,:::49155->29107/tcp