Eureka High Availability build

1. The principle of availability

Each Eureka Eureka only need to specify additional multiple addresses in the configuration can be achieved in a cluster built.

For example:

Suppose we have a master and slaveone two machines, you need to do is:

• The master register to slaveone above.
• The slaveone registered to master it.

If it is three machines, and so on:

• The master register to slaveone and slavetwo above.
• The slaveone registered to the master and slavetwo above.
• The slavetwo registered to the master and slaveone above.

2. build step

Configuration and eureka registry - to build a simple version of the same, except that an increase of more application.yml different environments.

Addition of application-master.yml:

server:
  port=8761
  
# 指向从节点的Eureka
eureka:
  client:
    serviceUrl:
      defaultZone: http://username:password@localhost:8762/eureka/

添加application-slaveone.yml：

server:
  port=8762
  
# 指向从节点的Eureka
eureka:
  client:
    serviceUrl:
      defaultZone: http://username:password@localhost:8761/eureka/

Need to be deployed on many machines, add the number of profiles

Add the application.yml follows:

spring:
  profiles
    active: master

After the deployment is successful, add startup parameters:

--spring.profiles.active= slaveone

3. Note

When the register has a plurality of nodes, the need to modify the configuration of the plurality of nodes eureka.client.serviceUrl.defaultZone addresses, a plurality of addresses separated by commas:

eureka:
  client:
    serviceUrl:
      defaultZone: http://username:password@localhost:8761/eureka/,http://username:password@localhost:8762/eureka/