Minecraft service startup script for CentOS/etc with backup command to that can upload .tar.gz of your minecraft folder/world to Amazon S3 through s3cmd.

minecraft

#!/bin/bash
# /etc/init.d/minecraft
# version 0.5.0 2015-04-20 (YYYY-MM-DD)
#
### BEGIN INIT INFO
# Provides:   minecraft
# Required-Start: $local_fs $remote_fs screen-cleanup
# Required-Stop:  $local_fs $remote_fs
# Should-Start:   $network
# Should-Stop:    $network
# Default-Start:  2 3 4 5
# Default-Stop:   0 1 6
# Short-Description:    Minecraft server
# Description:    Starts the minecraft server
### END INIT INFO

#Settings
SERVICE='minecraft_server.jar'
OPTIONS='nogui'
USERNAME='mcserver'
WORLD='world'
MINECRAFT_PATH='/home/mcserver/minecraft'
BACKUP_PATH='/home/mcserver/_backups'
BACKUP_S3_BUCKET='s3-bucket-name'
BACKUP_S3_FOLDER='sub/folder/in/bucket'
MAXHEAP=4096
MINHEAP=3072
HISTORY=1024
CPU_COUNT=1
INVOCATION="java -Xmx${MAXHEAP}M -Xms${MINHEAP}M -XX:+UseConcMarkSweepGC \
-XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:+AggressiveOpts \
-jar $SERVICE $OPTIONS" 

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

mc_start() {
  if  pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is already running!"
  else
    echo "Starting $SERVICE..."
    cd $MINECRAFT_PATH
    as_user "cd $MINECRAFT_PATH && screen -h $HISTORY -dmS minecraft $INVOCATION"
    sleep 7
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is now running."
    else
      echo "Error! Could not start $SERVICE!"
    fi
  fi
}

mc_saveoff() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running... suspending saves"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"say [Backup] Server going read-only...\"\015'"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-off\"\015'"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
    sync
    sleep 10
  else
    echo "$SERVICE is not running. Not suspending saves."
  fi
}

mc_saveon() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running... re-enabling saves"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-on\"\015'"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"say [Backup] Done! Server going read-write...\"\015'"
  else
    echo "$SERVICE is not running. Not resuming saves."
  fi
}

mc_stop() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Stopping $SERVICE"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map...\"\015'"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
    sleep 10
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"stop\"\015'"
    sleep 7
  else
    echo "$SERVICE was not running."
  fi
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Error! $SERVICE could not be stopped."
  else
    echo "$SERVICE is stopped."
  fi
} 

mc_update() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running! Will not start update."
  else
    as_user "cd $MINECRAFT_PATH && wget -q -O $MINECRAFT_PATH/versions http://s3.amazonaws.com/Minecraft.Download/versions/versions.json"
	snap=`awk -v linenum=3 'NR == linenum {print; exit}' "$MINECRAFT_PATH/versions"`
	snapVersion=`echo $snap | awk -F'\"' '{print $4}'`
	re=`awk -v linenum=4 'NR == linenum {print; exit}' "$MINECRAFT_PATH/versions"`
	reVersion=`echo $re | awk -F'\"' '{print $4}'`
	as_user "rm $MINECRAFT_PATH/versions"
	if [ "$1" == "snapshot" ]; then
	MC_SERVER_URL=http://s3.amazonaws.com/Minecraft.Download/versions/$snapVersion/minecraft_server.$snapVersion.jar
	else
	MC_SERVER_URL=http://s3.amazonaws.com/Minecraft.Download/versions/$reVersion/minecraft_server.$reVersion.jar
	fi
    as_user "cd $MINECRAFT_PATH && wget -q -O $MINECRAFT_PATH/minecraft_server.jar.update $MC_SERVER_URL"
    if [ -f $MINECRAFT_PATH/minecraft_server.jar.update ]
    then
      if `diff $MINECRAFT_PATH/$SERVICE $MINECRAFT_PATH/minecraft_server.jar.update >/dev/null`
      then 
        echo "You are already running the latest version of $SERVICE."
      else
        as_user "mv $MINECRAFT_PATH/minecraft_server.jar.update $MINECRAFT_PATH/$SERVICE"
        echo "Minecraft successfully updated."
      fi
    else
      echo "Minecraft update could not be downloaded."
    fi
  fi
}

mc_backup() {
   mc_saveoff
   
   NOW=`date "+%Y-%m-%d_%Hh%M"`
   BACKUP_FILE="$BACKUP_PATH/${WORLD}_${NOW}.tar.gz"
   
   echo "Backing up minecraft world..."
   as_user "cd \"$MINECRAFT_PATH\" && tar -zcf \"$BACKUP_FILE\" * && cd \"$BACKUP_PATH\""
   echo "Done!"
   
   mc_saveon
   
   echo "Uploading to Amazon S3..."
   as_user "s3cmd --quiet put \"$BACKUP_FILE\" s3://$BACKUP_S3_BUCKET/$BACKUP_S3_FOLDER/"
   echo "Done!"
   
   echo "Removing old backups..."
   as_user "find $BACKUP_PATH/ -type f -mtime +3 -delete >/dev/null 2>&1"
   echo "Done!"
}

mc_command() {
  command="$1";
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    pre_log_len=`wc -l "$MINECRAFT_PATH/logs/latest.log" | awk '{print $1}'`
    echo "$SERVICE is running... executing command"
    as_user "screen -p 0 -S minecraft -X eval 'stuff \"$command\"\015'"
    sleep .1 # assumes that the command will run and print to the log file in less than .1 seconds
    # print output
    tail -n $[`wc -l "$MINECRAFT_PATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MINECRAFT_PATH/logs/latest.log"
  fi
}

#Start-Stop here
case "$1" in
  start)
    mc_start
    ;;
  stop)
    mc_stop
    ;;
  restart)
    mc_stop
    mc_start
    ;;
  update)
    mc_stop
    mc_backup
    mc_update $2
    mc_start
    ;;
  backup)
    mc_backup
    ;;
  status)
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is running."
    else
      echo "$SERVICE is not running."
    fi
    ;;
  command)
    if [ $# -gt 1 ]; then
      shift
      mc_command "$*"
    else
      echo "Must specify server command (try 'help'?)"
    fi
    ;;
  
  *)
  echo "Usage: $0 {start|stop|update|backup|status|restart|command \"server command\"}"
  exit 1
  ;;
esac

exit 0