You need to do some extra work to send it to syslog:

1. On Spark Gateway side
   a. Create new file “logging.properties” under /SparkGateway folder; (Copy the one from JRE/lib folder and modify it by appending the following lines at the end)
   .level= INFO
   handlers= java.util.logging.ConsoleHandler, com.agafua.syslog.SyslogHandler
   # Syslog logger
   com.agafua.syslog.SyslogHandler.transport = udp
   com.agafua.syslog.SyslogHandler.facility = local0
   com.agafua.syslog.SyslogHandler.port = 514
   com.agafua.syslog.SyslogHandler.hostname = vmuser-xubuntu1604
   b. add VM argument for command to start the gateway:
   -Djava.util.logging.config.file=yourGatewayFolder/logging.properties

   2. On syslog server side (ubuntu)
   a. Edit  /etc/rsyslog.conf to comment-in (uncomment) the following two lines
   module(load=”imudp”)
   input(type=”imudp” port=”514″)
   b. Enter “/etc/rsyslog.d” directory, create a new file “60-java.conf” with content (file name can be anything meaningful):
   local0.* /var/log/gateway.log
   c. Restart syslog service by executing:
   sudo service rsyslog restart