springcloud config Configuration Center

Configuration Center Introduction

config server to read configuration from the local git or warehouse, it may be placed on a module arranged in management.

Configuring High Availability config server

The config-server configuration to a eureka-server service in unified management, config-server can be configured to a cluster:

New config server module

a) introducing a dependency

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

 

b) profile application.yml

spring:
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/shared
Search # -locations: File: E: // the Java / Local Disk
  profiles:
     active: native
  application:
    name: config-server

# The eureka server instance is registered to the service in management
eureka:
  client:
    ServiceUrl:
      defaultZone: http://localhost:8761/eureka/

 

Build shared folder in the project resource in and create a new file config-client-dev.yml, add the following

server:
  port: 8783

foo: foo version 1

 

c) Start class annotate

@EnableConfigServer

 

New config client module

a) introducing a dependency

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

 

b) the configuration file, bootstrap.yml

spring:
  application:
    name: config-client
  cloud:
    config:
      fail-fast: true
      discovery:
        enabled: true
        serviceId: config-server
  profiles:
    active: dev

eureka:
  client:
    ServiceUrl:
      defaultZone: http://localhost:8761/eureka/

 

The {spring.application.name} - {profiles.active} config-server module name to the shared directory query profile

c) Start class is not to add another comment

d) use, and configured to use the same local

@SpringBootApplication
@RestController
@EnableEurekaClient
public class ConfigClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigClientApplication.class, args);
    }

    @Value("${foo}")
    String foo;
    @RequestMapping(value = "/foo")
    public String hi(){
        return foo;
    }
}

 

test

Enter the address in the browser: HTTP: // localhost: 8783 / foo

Use Spring Cloud Bus refresh configuration

If we want to modify the configuration file, it does not restart the project with immediate effect, you need to use the spring cloud bus refresh configuration.

Modify config client module

Only need to modify the config-client module, you can achieve dynamic refresh

a) introducing a dependency

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

 

b) modify the configuration file, add the following, first install RabbitMQ,

  rabbitmq:
    host: localhost
    port: 15672
    username: guest
    password: guest
    Publisher -confirms: to true 
    Virtual -host: / # first security policy is set to false


management:
  security:
   enabled: false

 

c) adding annotations @RefreshScope class configured in the use of

@RestController
@RefreshScope
public class ConfigClientApplication {
    @Value("${foo}")
    String foo;
    @RequestMapping(value = "/foo")
    public String hi(){
        return foo;
    }
}

 

test

Config-client-dev.yml modify the configuration files in config-server project directory shared, then send post request http: // localhost: 8781 / bus / refresh, then HTTP: // localhost: 8783 / foo , you will find profiles modify the content in force