Here’s how you start up a GNU screen session at startup and give it a command to run.
#!/bin/bash cd /home/minesrv/minecraft_server/ screen -dmS minesrv java -server -Xincgc -Xmx3G -jar minecraft_server.jar nogui
So in this case we’re starting a minecraft server in a screen session.
Per the man page -dm does the following:
-d -m Start screen in "detached" mode. This creates a new session but
doesn't attach to it. This is useful for system startup
scripts.
the -S gives the screen session a name so it’s easier to find later on.
Then it runs the command, java, with its parameters.
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Another useful tool is sudo, so we can run our above startup script as a different user than root.
#!/bin/bash sudo -u minesrv -i /home/minesrv/scripts/startMinecraft
startMinecraft is the first bash script above. Here we’re using sudo to run it as the user ‘minesrv’.
The -i makes sudo perform all the standard login processes before running the script.
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And finally, you can just reference the startup script inside /etc/rc.local for most linux distros. That will make the script run at startup.
#!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. /home/minesrv/scripts/startAtBoottimeMinecraft exit 0