File Output

By default, Spring Boot logs only to the console and does not write log files. If you want to write log files in addition to the console output, you need to set a logging.file.name or logging.file.path property (for example, in your application.properties).

The following table shows how the logging.* properties can be used together:

Table 1. Logging properties
`logging.file.name`	`logging.file.path`	Example	Description
(none)	(none)		Console only logging.
Specific file	(none)	`my.log`	Writes to the specified log file. Names can be an exact location or relative to the current directory.
(none)	Specific directory	`/var/log`	Writes `spring.log` to the specified directory. Names can be an exact location or relative to the current directory.

Log files rotate when they reach 10 MB and, as with console output, ERROR-level, WARN-level, and INFO-level messages are logged by default.

Logging properties are independent of the actual logging infrastructure. As a result, specific configuration keys (such as logback.configurationFile for Logback) are not managed by spring Boot.