All Projects → BitInit → eureka-on-kubernetes

BitInit / eureka-on-kubernetes

Licence: MIT license
Deploy eureka cluster on kubernetes

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English

介绍

本项目目的是在kubernetes上方便、快捷的部署eureka集群。早期,有一个使用spring cloud开发的系统部署在docker swarm集群上,后来需要将该系统迁移到kubernetes集群上,为了能在kubernetes上方便部署eureka多实例,所以使用statefulsetheadless service完成该工作。

使用

步骤一:Clone 项目

git clone https://github.com/BitInit/eureka-on-kubernetes

步骤二:修改k8s-eureka-prod.yml配置信息

k8s-eureka-prod.yml中默认开启 3 个eureka实例,如果要自定义需要做两步修改。

第一步:修改StatefulSetreplicas为期望值n

第二步:修改ConfigMap中数据eureka_service_addresshttp://eureka-0.eureka:8761/eureka,...,http://eureka-(n-1).eureka:8761/eureka

步骤三:在kubernetes集群上部署eureka cluster

$ cd eureka-on-kubernetes
$ kubectl apply -f k8s-eureka-prod.yml

等待几分钟后,可以看到StatefulSet信息:

$ kubectl get statefulset
NAME     READY   AGE
eureka   3/3     28m

Pods

$ kubectl get pods
NAME                            READY   STATUS    RESTARTS   AGE
eureka-0                        1/1     Running   0          29m
eureka-1                        1/1     Running   0          28m
eureka-2                        1/1     Running   0          28m

Services:

$ kubectl get services
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
eureka       ClusterIP   None            <none>        8761/TCP         16m
eureka-np    NodePort    10.110.154.67   <none>        8761:30030/TCP   16m

此时,可通过Eureka UI查看Eureka基本信息,URL为http://<node-ip>:30030

success

eureka client连接eureka server

为了连接eureka servereureka client必须要知道eureka server的 ip 地址,这里提供三种方式连接eureka server

第一种方式

eureka clienteureka server如果部署在kubernetes的同一个namespace。此时可以使用名为eureka-cmConfigMapeureka_service_address配置数据设置 ip 地址

# kubernetes yaml file
env:
- name: EUREKA_SERVER_ADDRESS
  valueFrom:
    configMapKeyRef:
      name: eureka-cm
      key: eureka_service_address

# application.yml
eureka:
  client:
    serviceUrl:
      defaultZone: $EUREKA_SERVER_ADDRESS

第二种方式

eureka clienteureka server如果部署在同一个kubernetes集群中。此时可以使用headless service的域名地址,这里eureka默认部署在kubernetesdefault的命名空间中

eureka:
  client:
    serviceUrl:
      defaultZone: http://eureka-0.eureka.default.svc.cluster.local:8761/eureka,http://eureka-1.eureka.default.svc.cluster.local:8761/eureka,http://eureka-2.eureka.default.svc.cluster.local:8761/eureka

第三种方式

如果eureka client没有部署在该kubernetes中,此时应使用kubernetesNodePort方式访问eureka server

eureka:
  client:
    serviceUrl:
      defaultZone: http://<node-ip>:30030/eureka

其他

spring-cloud-kubernetes:通过kubernetes来支撑服务的发现与注册。

nacos-k8s: nacos是阿里开源的服务发现与注册中心、配置和服务管理的平台。

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