GrayLog2 Startup Script: put this inside /etc/init.d directory.

graylog2-server.sh

#!/bin/sh
#
# graylog2-server: graylog2 message collector
#
# chkconfig: - 98 02
# description: This daemon listens for syslog and GELF messages and stores them in mongodb
#

CMD=$1
NOHUP=`which nohup`
JAVA_HOME=/usr/java/latest
JAVA_CMD=$JAVA_HOME/bin/java

GRAYLOG2_SERVER_HOME=/opt/graylog2-server

start() {
  echo "Starting graylog2-server ..."
  $NOHUP $JAVA_CMD -jar $GRAYLOG2_SERVER_HOME/graylog2-server.jar > /var/log/graylog2.log 2>&1 &
}

stop() {
  PID=`cat /tmp/graylog2.pid`
  echo "Stopping graylog2-server ($PID) ..."
  kill $PID
}

restart() {
  echo "Restarting graylog2-server ..."
  stop
  start
}

case "$CMD" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart)
    restart
    ;;
  *)
    echo "Usage $0 {start|stop|restart}"
    RETVAL=1
esac