Spring-cloud Finchley microservice architecture from entry to proficient [6] BUS RabbitMQ configuration refresh

The last article introduced the highly available configuration center. How to update the configuration file without restarting the server? Please see the introduction below

1. Install rabbitMq

1. Download address

http://www.rabbitmq.com/download.html

2. Run

Enter http://localhost:15672 , and the following interface appears, indicating that the installation is successful

3. Cloud integration configuration instructions

• Default port: 5672

• Default username: guest

• Default password: guest

Second, the code implementation

1. Add dependencies

config server: commonservice-config add the following dependencies:

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-bus-amqp</artifactId>
            </dependency>

In config client:bussnessservice-user add

        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency> 
       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
       </dependency>
       <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>

2. Modify the configuration

Modify the yml files of the two projects and add the following configuration:

spring:
  rabbitmq: 
    host: localhost
    port: 5672
    username: guest
    password: guest
management: 
  endpoints:
    web:
      exposure: 
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*" 

Configuration instructions:

• rabbitmq configuration

• The bus request url is closed by default, so it needs to be opened to use

Add an attribute server.time=update version1 to the configuration file of the client bussnessservice-user to test the change of the attribute

3. Test

Start the three projects of eureka server, config server and config client in turn (start two ports to test batch update configuration files). When
starting the configuration center, you can see the following logs:

• /actuator/refresh : refresh a single node
• /actuator/bus-refresh: refresh all nodes

Startup complete:

Test with postman:
send Post request http://localhost:8801/getTestValue and http://localhost:8802/getTestValue

Modify the configuration file:

server:
  port: 8802
  time: update version100

Send post request http://localhost:8801/actuator/bus-refresh

Note: Adding spring-boot-starter-amqp dependencies sometimes results in errors. This is because there are multiple versions in maven, which need to be deleted, and then re-maven - update project

github: https://github.com/tianyana/springcloud

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