Spring cloud implements the HA method of Eureka registration center, cloudeureka

Spring cloud implements the HA method of Eureka registration center, cloudeureka

Preface:

In the previous example, our Eureka Server is single-node. Once the node fails in production, it cannot provide service registration. To ensure the high availability of the Registration Center, A multi-node service registration center is generally used in production.

1. Add the following configuration to the hosts file:

127.0.0.1 peer1 127.0.0.1 peer2 

2. modify the application. yml configuration file

--- Spring: profiles: peer1 # specify profile = peer1 application: name: Eureka-Server1 server: port: 8761 # register the service port number eureka: instance: hostname: peer1 # specify the host name client: serviceUrl: defaultZone: http: // peer2: 8762/eureka/# When profile = peer1, register yourself to the Eureka of peer2 --- spring: profiles: peer2 application: name: Eureka-Server2 server: port: 8762 eureka: instance: hostname: peer2 client: serviceUrl: defaultZone: http: // peer1: 8761/eureka/# service registration address, register yourself to peer2

3. Create a jar package

Enter the following command in the command line:

mvn clean package 

4. Execute jar

java -jar springcloud-eureka-ha-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1 java -jar springcloud-eureka-ha-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2 

5. Access Eureka Server

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

Enter http: // localhost: 8762/in the browser/

Some problems found: Eureka Server exists in registered-replicas and unavailable-replicas, and the current Eureka Server is unavailable. The reason is as follows:

spring:  application:   name: Eureka-Server2 

The names of the two Eureka servers must be the same. The results are as follows:

6. register the service on the dual Eureka Server

You only need to modify defaultZone.

# Eureka Server registration service address eureka. client. service-url.defaultZone = http: // peer1: 8761/eureka/, http: // peer2: 8762/eureka

VII. High Availability Verification

1. Enter http: // localhost: 7902/user/1 in the browser.

The result is as follows:

{"Id": 1, "username": "user1", "name": "zhangsan", "age": 20, "balance": 100.00}

Indicates Service Availability

2. Stop Eureka Server2 and find Server2 unavailable

3. Enter http: // localhost: 7902/user/1 in the browser.

{"Id": 1, "username": "user1", "name": "zhangsan", "age": 20, "balance": 100.00}

Through the above steps, you can implement Eureka HA. Please pay attention to some pitfalls!

The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.