In the standalone.xml file ,
Replace the line ,
<file relative-to="jboss.server.log.dir" path="server.log"/>
<file path="<Path to your log file>"/>
You might set the property in the bin/standalone.conf file which is used during start
Correct. Set the property -Djboss.server.log.dir=/var/log/jboss-as in your JAVA_OPTS in the standalone.conf or pass it via the command line. Since logging is one of the first things configured it needs to be set before the paths resolution kicks in.
James R. Perkins