<size-rotating-file-handler  name="FILE" autoflush="true">
                <formatter>
                    <named-formatter name="PATTERN"/>
                </formatter>
                <file relative-to="jboss.server.log.dir" path="server.log"/>
                <rotate-size value="20M"/>
                <max-backup-index value="5"/>
                <append value="true"/>
                <suffix value=".yyyy-MM-dd"/>
            </size-rotating-file-handler>