crontab

*/5 * * * * service multicraft sync

multicraft.sh

#!/bin/sh
### BEGIN INIT INFO
# Provides:          multicraft
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start the multicraft daemon
# Description:       Start ramdisks and the multicraft daemon
### END INIT INFO
# /etc/init.d/multicraft

USERNAME='minecraft'

MC_HOME="/home/minecraft/multicraft"
MC_PARAMS="-v"
MC_BIN="bin"

MC="$MC_HOME/$MC_BIN/multicraft"

RD_SIZE="8G" #G=giga, t=terra,m=mega,k=kilo, nothing=byte
RD_backingStore="$MC_HOME/servers_backup/"
RD="$MC_HOME/servers/"

ME=`whoami`
as_user() {
  if [ $ME == $USERNAME ] ; then
    bash -c "$1"
  else
    su - $USERNAME -c "$1"
  fi
}

syncToDisk(){
  if [ -d $RD ]; then
    echo "Syncing RAMDISK back to disk";
    cd $MC_HOME;
    rsync -r -t -og --perms --force "$RD" "$RD_backingStore"; 

    echo "Done syncing.";
  else 
    echo "Whoops Can't syn to disk. RAMDISK not started!" >&2;
  fi
}

case "$1" in
  start)
        if [ -d "$RD" ] && [ "$(ls -A $RD)" ]; then
          mv "$RD" "$RD_backingStore";
        fi
        if [ ! -d "$RD" ]; then
          # This almost should never happen
          as_user "mkdir -p $RD";
        fi
        mountpoint -q "$RD" ||  mount -t tmpfs -o size=$RD_SIZE tmpfs "$RD"

        rsync -r -t -og --perms --force "$RD_backingStore" "$RD";  #seed the ramdisk

        echo "Starting Multicraft"
        "$MC" $MC_PARAMS start
        ;;
  stop)
        echo "Stopping Multicraft"
        "$MC" $MC_PARAMS stop
        echo "Syncing Multicraft"
        syncToDisk
        sync
        ;;
  restart)
        echo "Restarting Multicraft"
        "$MC" $MC_PARAMS restart
        ;;
  sync)
        echo "Syncing Multicraft"
        if [ -d "$RD" ] && [ "$(ls -A $RD)" ]; then
          syncToDisk
          sync
        fi
        ;;
  *)
        echo "Usage: /etc/init.d/multicraft {start|stop|restart|sync}"
        exit 1
        ;;
esac

exit 0