How to set Tomcat log level under Debian

This article describes how to adjust the log level of the Tomcat server in the Debian system. Tomcat's logging configuration file logging.properties needs to be modified to implement it.

step:

1. Open configuration file: Use a text editor (such as nano or vim ) to open Tomcat's log configuration file. This file is usually located in /opt/tomcat/conf/logging.properties . Run commands with sudo permissions, for example:

    sudo nano /opt/tomcat/conf/logging.properties

2. Modify log level: Find lines similar to the following:

    org.apache.catalina.core.ContainerBase.[Catalina].[localhost].level = INFO
   org.apache.catalina.core.ContainerBase.[Catalina].[localhost].handlers = 2localhost.org.apache.juli.AsyncFileHandler, java.util.logging.ConsoleHandler

   level attribute specifies the log level. Available levels include: DEBUG , INFO , WARN , ERROR , and FATAL . Change INFO to the level you need, such as DEBUG :

    org.apache.catalina.core.ContainerBase.[Catalina].[localhost].level = DEBUG

3. (Optional) Modify processor level: You can modify the output level of the log processor, such as ConsoleHandler :

    java.util.logging.ConsoleHandler.level = DEBUG

4. Save and restart: Save the logging.properties file and close the editor. Then restart the Tomcat service to make the changes take effect:

    sudo systemctl restart tomcat

Tomcat's log output will now be recorded at the level you set. Please note that the above steps apply to the configuration of Tomcat 9 on Debian systems. Other Tomcat versions or operating systems, file paths and configurations may vary slightly.

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