可以透過ramdisk來解決I/O的問題。具體的方法如下：
1 #yum install java-1.7.0-openjdk
2 https://minecraft.net/download
#wget https://s3.amazonaws.com/MinecraftDownload/launcher/minecraft_server.jar
Ramdisk
http://www.minecraftwiki.net/wiki/Tutorials/Ramdisk_enabled_server
(1)建新的user
#useradd mine
修改mine這個user的密碼
#passwd mine
(2) 在/home/mine下，建下列的資料夾 minecraft minecraft_backups minecraft_ramdisk
#cd /home/mine
#mkdir minecraft
#mkdir minecraft_backups
#mkdir minecraft_ramdisk
然後用把ownership 改回給mine這個使用者
#chown -R mine.mine /home/mine/*
(3) 由附加檔案minecraft的內容
新增/etc/init.d/minecraft
#vim /etc/init.d/minecraft ( 複製, 貼上 )
#chmod +x /etc/init.d/minecraft
(4) 修改 /etc/init.d/minecraft的內容，username改成mine。( 修正路徑 ) ( 下方的檔案內容中已經做此修改。)
(5) #vim /etc/fstab
增加一行：
tmpfs /home/mine/minecraft_ramdisk tmpfs defaults,size=512m 0 0
(6) 直接掛上ramdisk
#mount -t tmpfs none /home/mine/minecraft_ramdisk -o size=512m
下 df -h指令來檢查有沒有變化。
#df -h
(7) 修改 cronjobs
#crontab -e
*/5 * * * * /etc/init.d/minecraft disksaverun
20 */6 * * * /etc/init.d/minecraft backup
(9)加入 system V style的啟動script
#chkconfig –list
#chkconfig –add minecraft
#service minecraft start
(10) 第一次啟動minecraft server 之後，client是無法連上的。
這個原因是因為/home/mine/minecraft_ramdisk/server.properties 這個檔案裡，
online-mode=true , 這樣子的話，只有正版才可以玩。
要改成
online-mode=false，這樣子，破解版才可以玩。
(11) #service minecraft restart
////////////////// 下方是minecraft server 的system V init script //////////////
#!/bin/bash
# /etc/init.d/minecraft
# version 0.5 2011-09-24 (YYYY-MM-DD)
### BEGIN INIT INFO
# Provides: minecraft
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Should-Start: $network
# Should-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Minecraft server
# Description: Starts the minecraft server
### END INIT INFO
#Settings
SERVICE='minecraft_server.jar'
USERNAME="mine"
MCSTORE="/home/$USERNAME/minecraft"
MCPATH="/home/$USERNAME/minecraft_ramdisk"
CPU_COUNT=1
INVOCATION="java -Xmx2048M -Xms2048M -server -jar $SERVICE nogui"
BACKUPPATH="/home/$USERNAME/minecraft_backups/"
ME=`whoami`
as_user() {
if [ "$ME" == "$USERNAME" ] ; then
bash -c "$1"
else
su - $USERNAME -c "$1"
fi
}
mc_start() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "Tried to start but $SERVICE was already running!"
else
echo "$SERVICE was not running... starting."
cd $MCPATH
if [ ! -f "$MCPATH/minecraft_server.jar" ]
then
echo "Ram drive empty... prepping."
as_user "cp -R $MCSTORE/* $MCPATH/"
fi
as_user "cd $MCPATH && screen -dmS minecraft $INVOCATION"
sleep 7
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is now running."
else
echo "Could not start $SERVICE."
fi
fi
}
mc_saveoff() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$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 was not running. Not suspending saves."
fi
}
mc_saveon() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$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 was not running. Not resuming saves."
fi
}
mc_stop() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running... stopping."
as_user "screen -p 0 -S minecraft -X eval 'stuff \"say SERVER SHUTTING DOWN IN 5 SECONDS. Saving map...\"\015'"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
sleep 5
as_user "screen -p 0 -S minecraft -X eval 'stuff \"stop\"\015'"
sleep 5
else
echo "$SERVICE was not running."
fi
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE could not be shut down... still running."
else
echo "$SERVICE is shut down."
fi
}
mc_update() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running! Will not start update."
else
MC_SERVER_URL=http://minecraft.net/`wget -q -O - http://www.minecraft.net/download.jsp | grep minecraft_server.jar\ | cut -d \" -f 2`
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/minecraft_server.jar $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/minecraft_server.jar"
echo "Minecraft successfully updated."
fi
else
echo "Minecraft update could not be downloaded."
fi
fi
}
mc_backup() {
echo "Backing up minecraft files"
if [ -f $BACKUPPATH/MCBKUP_`date "+%Y.%m.%d"`.tar.gz ]
then
for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
do
if [ -f $BACKUPPATH/MCBKUP_`date "+%Y.%m.%d"`-$i.tar.gz ]
then
continue
else
as_user "cd $MCSTORE && tar zcf $BACKUPPATH/MCBKUP_`date "+%Y.%m.%d"`-$i.tar.gz ."
break
fi
done
else
as_user "cd $MCSTORE && tar zcf $BACKUPPATH/MCBKUP_`date "+%Y.%m.%d"`.tar.gz ."
fi
echo "Backup complete"
}
mc_disksaverun() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "Saving ramdrive to disk."
if [ ! -f $MCPATH/$SERVICE ]
then
echo "Error.. Minecraft not in ram"
else
if [ -d $MCSTORE/world2 ]
then
as_user "rm -r $MCSTORE/world2"
fi
if [ -d $MCSTORE/world ]
then
as_user "mv $MCSTORE/world $MCSTORE/world2"
fi
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'"
as_user "cp -R $MCPATH/* $MCSTORE/"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-on\"\015'"
if [ -d $MCSTORE/world2 ]
then
as_user "rm -r $MCSTORE/world2"
fi
fi
else
echo "Service is not running"
fi
}
mc_disksavehalt() {
echo "Saving ramdrive to disk."
if [ ! -f $MCPATH/minecraft_server.jar ]
then
echo "Error.. Minecraft not in ram"
else
if [ -d $MCSTORE/world2 ]
then
as_user "rm -r $MCSTORE/world2"
fi
if [ -d $MCSTORE/world ]
then
as_user "mv $MCSTORE/world $MCSTORE/world2"
fi
echo "Saving, screen session closed"
as_user "cp -R $MCPATH/* $MCSTORE/"
if [ -d $MCSTORE/world2 ]
then
as_user "rm -r $MCSTORE/world2"
fi
fi
}
#Start-Stop here
case "$1" in
start)
mc_start
;;
stop)
mc_stop
mc_disksavehalt
;;
restart)
mc_stop
mc_disksavehalt
mc_start
;;
update)
mc_stop
mc_backup
mc_update
mc_start
;;
backup)
mc_disksaverun
mc_saveoff
mc_backup
mc_saveon
;;
disksavehalt)
mc_disksavehalt
;;
disksaverun)
mc_disksaverun
;;
status)
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running."
else
echo "$SERVICE is not running."
fi
;;
*)
echo "Usage: /etc/init.d/minecraft {start|stop|update|backup|status|restart|disksaverun}"
exit 1
;;
esac
exit 0