Spring 启动 (Netflix) 尤里卡副本

Question

I can't configure Eureka with a replica. I have two instances of Eureka Server running on the same laptop. It always see each other as unavailable-replica .

The is what the Eureka panel says: Eureka message

These are the application.yml files:

------------------------------
server:
    port: 8761

eureka:   
    instance:
        hostname: eurekaserver1
    client:
       registerWithEureka: false
       fetchRegistry: false
       serviceUrl:
          defaultZone: http://localhost:8762/eureka

--------------------------------

server:
    port: 8762

eureka:
    instance:
       hostname: eurekaserver2
    client:
       registerWithEureka: false
       fetchRegistry: false
       serviceUrl:
          defaultZone: http://localhost:8761/eureka

--------------------------------

Answer 1

You need to have different hostnames and the same application name(appname). Here is a detailed guide on Eureka's peer awareness.

Answer 2

I'm using the following config and it works fine, I think it does not work since you have set registerWithEureka and fetchRegistry to false .

Node.1:

server:
    port: 8761

eureka:
  instance:
    appname: discovery-cluster
    hostname: discovery-node1
    preferIpAddress: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://${eureka.replicas.node.host}:${eureka.replicas.node.port}/eureka/
  replicas:
    node:
      host: ${node2.ip}
      port: 8762

---

Node.2:

server:
    port: 8762

eureka:
  instance:
    appname: discovery-cluster
    hostname: discovery-node2
    preferIpAddress: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://${eureka.replicas.node.host}:${eureka.replicas.node.port}/eureka/
  replicas:
    node:
      host: ${node1.ip}
      port: 8761

---

Answer 3

Actually it's the combination of both @indika and @Ashraf answers that will make it work:

1. You need to use hostnames, for example adding XXXX peer1 peer2 on your \etc\hosts file, where XXXX needs to be your laptop's IP address, not 127.0.0.1 .
2. You need to remove registerWithEureka: false from your application.yml file. The Eureka servers have to register themselves with each other.

Following the documentation here and adding the two alias peer1 and peer2 on my /etc/hosts , I managed to configure two Eureka servers on my laptop with valid available-replicas using the application.yml below:

---
server:
  port: 8081
spring:
  profiles: peer1
eureka:
  instance:
    hostname: peer1
  client:
    serviceUrl:
      defaultZone: http://peer2:8082/eureka/

---
server:
  port: 8082
spring:
  profiles: peer2
eureka:
  instance:
    hostname: peer2
  client:
    serviceUrl:
      defaultZone: http://peer1:8081/eureka/

You can run both instances using the two different profiles as follows:

$ java -jar -Dspring.profiles.active=peer1 build/libs/registry.jar
$ java -jar -Dspring.profiles.active=peer2 build/libs/registry.jar