4.1.3.3 External Configuration File 6.0.0

(Quick Reference) # 4.1.3.3 External Configuration File Version: 6.0.0 ## 4.1.3.3 External Configuration File If you set the configuration property `logging.config`, you can instruct `Logback` to use an external configuration file. grails-app/conf/application.yml
    logging:
        config: /Users/me/config/logback.groovy
Alternatively, you can supply the configuration file location with a system property: `$ ./gradlew -Dlogging.config=/Users/me/config/logback.groovy bootRun` Or, you could use an environment variable:
    $ export LOGGING_CONFIG=/Users/me/config/logback.groovy
    $ ./gradlew bootRun
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