Minecraft wiki entry for Ramdisk_enabled_server, associated text: You can use the start.sh script to mount your world in shared memory each time you reboot your server. Then you can start the Minecraft server as normal (or add a 3rd line to start.sh for convenience). If you choose to start the server with start.sh and use the screen command, be sure to start the start.sh script with screen. Using screen inside the script causes the server to run in the background, leaving you unable to run console commands.