我有一台尤里卡服务器。
server:
port: 8761
eureka:
client:
registerWithEureka: false
fetchRegistry: false
我有一个尤里卡客户。
spring:
application:
name: mysearch
server:
port: 8020
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka
instance:
preferIpAddress: true
我的 eureka 客户端正在 docker 容器中运行。
FROM java:8
COPY ./mysearch.jar /var/tmp/app.jar
EXPOSE 8180
CMD ["java","-jar","/var/tmp/app.jar"]
我正在通过
java -jar eureka-server.jar
启动尤里卡服务器
之后,我使用以下命令启动 eureka 客户端的 docker 实例
sudo docker build -t web .
和sudo docker run -p 8180:8020 -it web
。
我可以从浏览器访问尤里卡客户端和服务器,但客户端未与尤里卡服务器连接。我无法在尤里卡服务器仪表板中看到客户端。我收到以下错误和警告。
WARN 1 --- [tbeatExecutor-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: java.net.ConnectException: Connection refused (Connection refused)
ERROR 1 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_FLIGHTSEARCH/98b0d95fd668:flightsearch:8020 - was unable to send heartbeat!
INFO 1 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_FLIGHTSEARCH/98b0d95fd668:flightsearch:8020: registering service...
ERROR 1 --- [nfoReplicator-0] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error
WARN 1 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: java.net.ConnectException: Connection refused (Connection refused)
WARN 1 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_FLIGHTSEARCH/98b0d95fd668:flightsearch:8020 - registration failed Cannot execute request on any known server
WARN 1 --- [nfoReplicator-0] c.n.discovery.InstanceInfoReplicator : There was a problem with the instance info replicator
我正在 AWS EC2 Ubuntu 实例中执行此操作。 谁能告诉我我在这里做错了什么?
server:
ports:
- "8761:8761"
eureka:
client:
registerWithEureka: false
fetchRegistry: false
经过上述更改,端口 8761 将在主机上公开并可以连接到服务器。 当您使用 localhost“http://localhost:8761/eureka”进行连接时,它正在主机上搜索端口 8761。
在 Eureka 客户端配置中使用主机 ip 而不是 localhost ,因为如果使用 localhost ,它会在容器内搜索端口 8761
确保您运行在Swarm模式下。(单节点也可以运行Swarm)
$ docker swarm init
创建覆盖网络,以便服务可以相互 ping 通。
$ docker network create -d overlay mybridge
为 eurika 客户端设置 application.property 如下
eureka.client.service-url.defaultZone=http://discovery:8761/eureka
现在创建第一个发现服务(Eureka 发现服务器)
$ docker service create -d --name discovery --network mybridge \
--replicas 1 -p 8761:8761 server-discovery
打开浏览器并点击端口为 8761 的任意节点
现在创建客户服务:
$ docker service create -d --name goodbyeapp --network mybridge \
--replicas 1 -p 2222:2222 goodbye-service
这将注册到发现服务。
在容器世界中,每次eureka服务器重启时,eureka服务器ip地址都会发生变化。因此,为 eureka 服务器 url 指定主机 IP 地址并不总是有效。
在 docker-compose.yml 中,我必须将 eureka 客户端服务链接到 eureka 服务器容器。在我链接服务之前,尤里卡客户端无法连接到服务器。
这已经在最近的另一篇文章中得到了回答:使用 docker-compose 时应用程序未注册到 eureka
注意:- 仅使用小写字母大小写的容器名称
version: '3'
services:
openeyeserviceregistry:
container_name: openeyeserviceregistry
build:
context: ./ServiceRegistry/OpenEyeServiceRegistry/
dockerfile: Dockerfile
ports:
- "8761:8761"
networks:
- springboot-net
restart: on-failure
openeyeimageservice:
container_name: openeyeimageservice
build:
context: ./ImageService/OpenEyeImageService/
dockerfile: Dockerfile
ports:
- "8083:8083"
environment:
- eureka.client.service-url.defaultZone=http://openeyeserviceregistry:8761/eureka/
- eureka.client.enabled=true
- eureka.host=OpenEyeServiceRegistry
- eureka.instance.preferIpAddress=true
depends_on:
openeyeserviceregistry:
condition: service_started
networks:
- springboot-net
restart: on-failure
networks:
springboot-net:
name: springboot-net
driver: bridge
external: true
尤里卡服务器的application.yml
server:
port: 8761
spring:
application:
name: ServiceRegistry
eureka:
instance:
prefer-ip-address: true
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
server:
waitTimeInMsWhenSyncEmpty: 0
eureka客户端申请
server:
port: 8083
spring:
application:
name: IMAGE-SERVICE
eureka:
instance:
prefer-ip-address: true
hostname: localhost
client:
registerWithEureka: true
fetchRegistry: true
service-url:
defaultZone: http://127.0.0.1:8761/
server:
waitTimeInMsWhenSyncEmpty: 0
尤里卡服务器的 Docker 文件
FROM openjdk:17-jdk-alpine
WORKDIR /opt
ENV PORT 8082
EXPOSE 8082
MAINTAINER dheeraj198922
COPY ./target/OpenEye_Service_Registry.jar /opt
ENTRYPOINT ["java","-jar","OpenEye_Service_Registry.jar"]
eureka 客户端之前的 Dockerfile
FROM openjdk:17-jdk-alpine
WORKDIR /opt
ENV PORT 8083
EXPOSE 8083
MAINTAINER dheeraj198922
COPY ./target/OpenEye_Image_Service.jar /opt
ENTRYPOINT ["java","-jar","OpenEye_Image_Service.jar"]