Tutorials/Server startup script/Script


 * 1) !/bin/bash
 * 2) /etc/init.d/minecraft
 * 3) version 0.3.9 2012-08-13 (YYYY-MM-DD)


 * 1) BEGIN INIT INFO
 * 2) Provides:   minecraft
 * 3) Required-Start: $local_fs $remote_fs
 * 4) Required-Stop:  $local_fs $remote_fs
 * 5) Should-Start:   $network
 * 6) Should-Stop:    $network
 * 7) Default-Start:  2 3 4 5
 * 8) Default-Stop:   0 1 6
 * 9) Short-Description:    Minecraft server
 * 10) Description:    Starts the minecraft server
 * 11) END INIT INFO

SERVICE='minecraft_server.jar' OPTIONS='nogui' USERNAME='minecraft' WORLD='world' MCPATH='/home/minecraft/minecraft' BACKUPPATH='/media/remote.share/minecraft.backup' MAXHEAP=2048 MINHEAP=1024 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"
 * 1) Settings

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 $MCPATH as_user "cd $MCPATH && 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 SERVER BACKUP STARTING. Server going readonly...\"\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 SERVER BACKUP ENDED. 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 $MCPATH && wget -q -O $MCPATH/versions http://s3.amazonaws.com/Minecraft.Download/versions/versions.json" snap=`awk -v linenum=3 'NR == linenum {print; exit}' "$MCPATH/versions"` snapVersion=`echo $snap | awk -F'\"' '{print $4}'`	re=`awk -v linenum=4 'NR == linenum {print; exit}' "$MCPATH/versions"`	reVersion=`echo $re | awk -F'\"' '{print $4}'` as_user "rm $MCPATH/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 $MCPATH && wget -q -O $MCPATH/minecraft_server.jar.update $MC_SERVER_URL" if [ -f $MCPATH/minecraft_server.jar.update ] then if `diff $MCPATH/$SERVICE $MCPATH/minecraft_server.jar.update >/dev/null` then echo "You are already running the latest version of $SERVICE." else as_user "mv $MCPATH/minecraft_server.jar.update $MCPATH/$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="$BACKUPPATH/${WORLD}_${NOW}.tar" echo "Backing up minecraft world..." #as_user "cd $MCPATH && cp -r $WORLD $BACKUPPATH/${WORLD}_`date "+%Y.%m.%d_%H.%M"`" as_user "tar -C \"$MCPATH\" -cf \"$BACKUP_FILE\" $WORLD"

echo "Backing up $SERVICE" as_user "tar -C \"$MCPATH\" -rf \"$BACKUP_FILE\" $SERVICE" #as_user "cp \"$MCPATH/$SERVICE\" \"$BACKUPPATH/minecraft_server_${NOW}.jar\""

mc_saveon

echo "Compressing backup..." as_user "gzip -f \"$BACKUP_FILE\"" echo "Done." }

mc_command { command="$1"; if pgrep -u $USERNAME -f $SERVICE > /dev/null then pre_log_len=`wc -l "$MCPATH/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 $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/logs/latest.log" fi }

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    ;;
 * 1) Start-Stop here

*) echo "Usage: $0 {start|stop|update|backup|status|restart|command \"server command\"}"  exit 1  ;; esac

exit 0