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This article mainly shows you "Spring Cloud how to achieve a high-availability configuration center", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to achieve high-availability configuration center Spring Cloud" this article.

How does the configuration center read the configuration file from the remote git? when there are many service instances, it reads the file from the configuration center. You can consider turning the configuration center into a micro-service and clustering it to achieve high availability. The architecture figure is as follows:

I. preparatory work

Continue to use the project in the previous article to create an eureka-server project to use as a service registry. The start of introducing Eureka into its pom.xml file depends on spring-cloud-starter-eureka-server, as follows

Org.springframework.cloudspring-cloud-starter-eureka-server

On the configuration file application.yml, specify the service port as 8889, plus the basic configuration as the service registry, the code is as follows:

Server: port: 8889eureka: instance: hostname: localhost client: registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

Entry class:

@ EnableEurekaServer@SpringBootApplicationpublic class EurekaServerApplication {public static void main (String [] args) {SpringApplication.run (EurekaServerApplication.class, args);}} II. Transform config-server

The starting point of adding EurekaClient to its pom.xml file depends on spring-cloud-starter-eureka, as follows:

Org.springframework.cloud spring-cloud-starter-eureka

Configuration file application.yml, which specifies that the service registration address is http://localhost:8889/eureka/. Other configurations are the same as in the previous article. The complete configuration is as follows:

Spring.application.name=config-serverserver.port=8888spring.cloud.config.server.git.uri= https://github.com/forezp/SpringcloudConfig/spring.cloud.config.server.git.searchPaths=respospring.cloud.config.label=masterspring.cloud.config.server.git.username= your usernamespring.cloud.config.server.git.password= your passwordeureka.client.serviceUrl.defaultZone= http://localhost:8889/eureka/

Finally, you need to add the @ EnableEureka annotation to the startup class Application of the program.

Third, transform config-client

To register it to the service registry, as an Eureka client, you need a pom file plus a start-up dependency spring-cloud-starter-eureka, as follows:

Org.springframework.cloud spring-cloud-starter-eureka

The configuration file bootstrap.properties, note that it is bootstrap. Plus the registered address of the service is http://localhost:8889/eureka/

Spring.application.name=config-clientspring.cloud.config.label=masterspring.cloud.config.profile=dev#spring.cloud.config.uri= http://localhost:8888/eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/spring.cloud.config.discovery.enabled=truespring.cloud.config.discovery.serviceId=config-serverserver.port=8881

Spring.cloud.config.discovery.enabled reads files from the configuration center.

The servieId of spring.cloud.config.discovery.serviceId configuration center, that is, the service name.

At this time, it is found that when reading the configuration file, the ip address is no longer written, but the service name. At this time, if the configuration service is deployed in multiple copies, it will be highly available through load balancing.

Start eureka-servr,config-server,config-client in turn and visit http://localhost:8889/

Visit http://localhost:8881/hi and the browser displays:

Foo version 3

These are all the contents of the article "how to achieve a highly available configuration Center for Spring Cloud". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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