What about Bootstrap.yml

The role of Bootstrap.yml

load order

If application.yml and bootstrap.yml are in the same directory: bootstrap.yml is loaded first and then application.yml, and bootstrap.yml is used for the bootstrap phase of the application context. bootstrap.yml is loaded by the parent Spring ApplicationContext.

Configuration difference

Bootstrap is the configuration context loading of spring cloud. Loaded by the spring-cloud-context package. Introduce dependencies

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

Concrete loading class

key code

public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
		ConfigurableEnvironment environment = event.getEnvironment();
		if (!environment.getProperty("spring.cloud.bootstrap.enabled", Boolean.class,
				true)) {
			return;
		}
		// don't listen to events in a bootstrap context
		if (environment.getPropertySources().contains(BOOTSTRAP_PROPERTY_SOURCE_NAME)) {
			return;
		}
		ConfigurableApplicationContext context = null;
		String configName = environment
				.resolvePlaceholders("${spring.cloud.bootstrap.name:bootstrap}");
		for (ApplicationContextInitializer<?> initializer : event.getSpringApplication()
				.getInitializers()) {
			if (initializer instanceof ParentContextApplicationContextInitializer) {
				context = findBootstrapContext(
						(ParentContextApplicationContextInitializer) initializer,
						configName);
			}
		}
		if (context == null) {
			context = bootstrapServiceContext(environment, event.getSpringApplication(),
					configName);
		}
		apply(context, event.getSpringApplication(), environment);
	}

 Application is the configuration loading of spring boot. Introduce dependencies

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Spring Cloud configuration center multi-environment configuration

One: spring boot multi-environment configuration file

We know that spring boot can distinguish configurations by file name, as follows:
application-dev.yml #Development environment
application-test.yml #Test environment
application-prod.yml #Formal environment

Two: spring cloud multi-environment configuration file

But spring cloud uses the configuration center, just a boostrap.yml, and does not support the file name to distinguish. The method of distinguishing the environment in the spring cloud configuration center bootstrap.yml is as follows:

spring:
  profiles:
    active: dev
  application:
    name: user-server
feign:
  hystrix:
    enabled: true
##上面是基础配置，不用上配置中心那种
##下面是环境区分，主要不同环境不同文件获取
---
#开发环境
spring:
  profiles: dev
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
        namespace: c97d4f46-deba-5588-b05f-c2a061ccc688
      config:
        server-addr: localhost:8848
        file-extension: yaml
        group: DEFAULT_GROUP
        namespace: c97d4f46-deba-5588-b05f-c2a061ccc688
---
#正式环境
spring:
  profiles: prod
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
        namespace: aa3de4c8-61ad-5568-9887-ed731659edd4
      config:
        server-addr: localhost:8848
        file-extension: yaml
        group: DEFAULT_GROUP
        namespace: aa3de4c8-61ad-5568-9887-ed731659edd4
---
#测试环境
spring:
  profiles: test
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
        namespace: 98adcdd5-f25c-7890-b8f3-97352adc83e8
      config:
        server-addr: localhost:8848
        file-extension: yaml
        group: DEFAULT_GROUP
        namespace: 98adcdd5-f25c-7890-b8f3-97352adc83e8

Multiple configurations are separated by -, and then the specific environment configuration is represented by spring.profiles=environment.

Three: java startup method

At startup, we can specify the running reference configuration on our server such as:

java -jar -Dspring.profiles.active=test *****.jar

或者dockerfile启动方式
ENTRYPOINT ["java","-jar","-Dspring.profiles.active=test","*****.jar"]