What is the operation of SpringBoot to dynamically modify the log level?

The traditional approach is generally:

1. Modify the log level in the configuration

2. Restart the application

3. Check the error log to troubleshoot the problem when the problem occurs

This process requires restarting the application, which is more troublesome and less efficient. Moreover, for large-scale online projects, it is impossible to stop and restart at will. So is there a way to dynamically change the log level without restarting the application?

Now, let Lao Wan teach you how to dynamically modify the log level through SpringBoot's actuator component.

1. Add dependencies

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

2. Configure the port exposed by actuator

#启用actuator端口
management.endpoints.enabled-by-default=fasle
#设置actuator的访问根路径，默认是/actuator
management.endpoints.web.base-path=/message
#启用的端点
management.endpoints.web.exposure.include=loggers

Here I modified the default access path of actuator/actuator to /message, for It is saved consistent with the basic access path of the project.

Two configuration methods to enable the port:

Method 1: (Recommended)

management.endpoints.web.exposure.include=loggers

Method 2: (Test in this way Not effective)

management.endpoint.loggers.enabled=true

Additional: How to disable the info port

management.endpoints.enabled-by-default=false
management.endpoint.info.enabled=true

About the actuator component, it is called one of the four major components of spring boot and has powerful functions. Everyone can find some information on the Internet to learn more.

actuator’s endpoint port description:

If using web application (Spring MVC, Spring WebFlux, or Jersey), you can also use the following endpoints:

management.endpoints.web.exposure.include=*
management.endpoints.web.exposure.exclude=env,beans

@Configuration
public class ActuatorSecurity extends WebSecurityConfigurerAdapter {
 
@Override
protected void configure(HttpSecurity http) throws Exception {
    http.requestMatcher(EndpointRequest.toAnyEndpoint()).authorizeRequests()
    .anyRequest().permitAll()
}

}

curl -H "Content-Type: application/json" -X POST --data 
"
{
    "configuredLevel": "DEBUG"
}
" 
http://localhost:8090/message/loggers/com.wxswj.provider.message.controller

curl -H "Content-Type: application/json" -X POST --data "{"configuredLevel": "DEBUG"}" http://localhost:8090/loggers/com.wxswj.provider.message.controller

{
"configuredLevel": "DEBUG",
"effectiveLevel": "DEBUG"
}