Spring Cloud Eureka Server and client based on spring Boot 2.0.3

springbootversion = ' 2.0.3.RELEASE '

springcloudversion = ' Finchley.release '

1. Service Discovery and Service registration

Service discovery: How can I provide a service to the client? The client is looking for it, or the server side helps it find it.
Client discovery: The client queries the service registry and then uses the load balancing algorithm to select an instance from and make a request.
Server-side discovery: The client requests a service through a load balancer, the load Balancer queries the service registry, and forwards the request to the available service instances.
Service registration:
Self-registration: service instance registering itself
Third-party registration mode: The service Registrar tracks changes to the running instance by querying the deployment environment or subscribing to events. Once a new available service instance is detected, the service is registered with the registry. Service Manager is also responsible for unregistering terminated service instances.

2. Region and Zone

Region: Based on geographic location we refer to an area's infrastructure services collection as an area. The AWS region allows AWS Cloud services to be geographically closer to our users, while allowing users to choose from different areas to store their data to meet local regulatory compliance requirements.
Each region of the availability zone:aws is typically made up of multiple availability zones (AZ), and an availability zone typically consists of multiple data centers. AWS introduces an availability zone design primarily to improve the high availability of user applications. Because the availability zone and the availability zone are designed to be independent of each other, that is, they will have independent power supply, independent network, etc., so that if an availability zone problems, it will not affect the other availability zone.

Feel is the concept of disaster recovery backup, such as a company in Beijing has two rooms, one in the village, one in the land, each room has a Eureka server, the two Eureka Server region and zone configuration

Eureka Server1

Region:beijing

Zone:yizhuang

Eureka Server2

Region:beijing

Zone:shangdi

3. Eureka Architecture

4, Eureka actual combat

"Simplest Eureka Server"
1) Main class
@EnableEurekaServer
2) application.yml (Standalone Eureka Server)

  port:8761

  
    
  
    False
    False
    
    Defaultzone:http://${eureka.instance.hostname}:${server.port}/eureka/

Enter http://localhost:8761/in the browser

3) Reliance
Compile (' Org.springframework.cloud:spring-cloud-starter-netflix-eureka-server')

If Gradle cannot find the Eureka package , add the following in Build.gradle
Reason: Due to Gradle ' s dependency resolution rules and the lack of a parent BOM feature

ext {springcloudversion = ' finchley.release '}dependencymanagement {imports {Mavenbom ' org.springframework.cloud:sp Ring-cloud-dependencies:${springcloudversion} "}}

"Registration service to Eureka Sever"
1) Main class
@EnableEurekaClient
@EnableDiscoveryClient more general, not limited to Eureka
2.0 does not need to add this annotation , as long as the classpath has spring-cloud-starter-netflix-eureka-client.

2) application.yml

spring:application:name:user-serviceeureka:client:serviceUrl:defaultZone:http:/ /localhost:8761/eureka/

3) Reliance

Compile (' org.springframework.cloud:spring-cloud-starter-netflix-eureka-client ')
If Gradle cannot find Eureka package, Due to Gradle's dependency resolution rules and the lack of a parent BOM feature

See the related configuration for Build.gradle in Eureka Server.

Spring Cloud Eureka Server and client based on spring Boot 2.0.3