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Using the Distributed Configuration Center

Spring Cloud Huawei supports two configuration centers:

  • Use the distributed configuration center provided by CSE.
    1. Download the local lightweight microservice engine, which contains the configuration center.
    2. Connect to the CSE engine.
  • Use the servicecomb-kie distributed configuration center to support the long polling push model.

    Set up the environment based on the Quick Start in the readme file. Such a distributed configuration center will be rolled out on HUAWEI CLOUD

Getting Started

  1. Add the following dependencies. 

      <dependencies> 
    <dependency> 
      <groupId>com.huaweicloud</groupId>  
      <artifactId>spring-cloud-starter-huawei-config</artifactId> 
    </dependency> 
  </dependencies>

  2. Create a project or module and define a configuration file.

    The bootstrap.yml configuration file is used. In Spring Cloud, the startup priority of the bootstrap.yml configuration file is higher than that of the application.yml configuration file. When the configuration information is obtained from the configuration center, the related information needs to be defined in the bootstrap.yml configuration file.

    spring: 
  application: 
    name: price 
  cloud: 
    servicecomb: 
      config: 
        serverAddr: https://cse.cn-east-3.myhuaweicloud.com  
        watch: 
          delay: 10000
      credentials:
        enabled: true
        accessKey: your ak
        secretKey: your sk
        akskCustomCipher: default

  3. Obtain the value configured in the configuration center from the @Value annotation. 

    @Value("${server.port}")

Running the Demo

The following shows how to access the distributed configuration center based on a project demo. spring-cloud-huawei-sample/config-demo is used to simulate the scenario where ServiceStage is used to implement distributed configuration in a Spring Cloud project.

  1. Create related configurations on ServiceStage, for example, dd in the demo. For details, see Global Configuration.
  2. Modify the bootstrap.yml file and start the service. 

    spring: 
  application: 
    name: price 
  cloud: 
    servicecomb: 
      config: 
        serverAddr: https://cse.cn-east-3.myhuaweicloud.com  
        watch: 
          delay: 10000
      credentials:
        enabled: true
        accessKey: your ak
        secretKey: your sk
        akskCustomCipher: default

  3. Implement verification.

    Access the following address (the value of dd configured in the configuration center will then be displayed):

    http://127.0.0.1:8080/price?id=11

Configuration Items

The following table lists the configuration items in the bootstrap.yaml file.

Configuration Item

Key

Default Value

ServiceComb start

spring.cloud.servicecomb.config.enabled

true

Service name

spring.cloud.servicecomb.discovery.serviceName

If no service name exists, use spring.application.name.

Application name

spring.cloud.servicecomb.discovery.appName

default

Environment name

server.env

""

Version

spring.cloud.servicecomb.discovery.version

-

Configuration center address. You can use commas (,) to separate multiple addresses.

spring.cloud.servicecomb.config.serverAddr

""

Configuration center type. (The value can be kie, indicating the access kie. It is connected to config-center by default.)

spring.cloud.servicecomb.config.serverType

-

long polling (supported by only kie).

spring.cloud.servicecomb.config.enableLongPolling

true

Default polling configuration period

spring.cloud.servicecomb.config.watch.delay

10*1000 ms

Waiting time for establishing a long polling

spring.cloud.servicecomb.config.watch.pollingWaitTimeInSeconds

20 s

To interconnect with the professional engine, you need to configure the AK/SK for IAM authentication. The AK/SK configuration items in the bootstrap.yaml file are described as follows:

Configuration Item

Key

Default Value

Authentication enablement

spring.cloud.servicecomb.credentials.enabled

false

Tenant AK

spring.cloud.servicecomb.credentials.accessKey

-

Tenant SK

spring.cloud.servicecomb.credentials.secretKey

-

Cipher (set it to default)

spring.cloud.servicecomb.credentials.akskCustomCipher

default

Region

spring.cloud.servicecomb.credentials.project

""
Parent topic: Spring Cloud Huawei