how do I change log level in runtime without restarting spring boot application

java spring logging spring-boot pcf
Samir Padhy picture Samir Padhy · Nov 21, 2015 · Viewed 58.3k times · Source

I have deployed springboot application in PCF . I want to log the message based on the environment variable .What should I do so that the run time log level change will work without restarting the application?

Answer

Michael Simons picture Michael Simons · Feb 3, 2017

Changing the log level in Spring Boot 1.5+ can be done with a http-endpoint

Add

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

and than you can use

curl -X "POST" "http://localhost:8080/loggers/de.springbootbuch" \
     -H "Content-Type: application/json; charset=utf-8" \
     -d $'{
  "configuredLevel": "WARN"
}'

Where everything beyond /loggers/ is the name of the logger.

If you running this in PCF it get's even better: This is directly supported from their backend.

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