<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">As documented in <a href="https://logback.qos.ch/manual/configuration.html" class="">https://logback.qos.ch/manual/configuration.html</a></div><div class=""><br class=""></div><div class="">You can specify a particular config file like this:</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class="">You may specify the location of the default configuration file with a system property named"logback.configurationFile". The value of this property can be a URL, a resource on the class path or a path to a file external to the application.</blockquote></div><div class=""><p class="source" style="border-top-width: 1px; border-top-style: solid; border-top-color: rgb(221, 221, 221); border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(221, 221, 221); background-color: rgb(245, 245, 245); font-family: Courier, 'MS Courier New', Prestige, monospace; padding-left: 1ex; white-space: pre; padding-bottom: 0.5ex; padding-top: 0.5ex;">java <b class="">-Dlogback.configurationFile=/path/to/config.xml</b> chapters.configuration.MyApp1</p></div><div class=""><br class=""></div><div class="">If you don’t want to override the whole file, but just want to be able to set debug level just by setting a system, then see my answer here: <a href="http://stackoverflow.com/a/5884505/191084" class="">http://stackoverflow.com/a/5884505/191084</a></div><div class=""><br class=""></div><div class="">Thanks</div><div class=""><br class=""></div><div class="">David</div></body></html>