Systemd Unit file for Minecraft Server

1. Connect to your (v)root server or if you want to run the server on your machine, open a terminal.
   
2. Become root using su or sudo. To check if you are root run "echo $EUID" if it returns "0" you are root.
   
3. Next install the necessary packages "apt install openjdk-8-jre-headless curl screen nano bash grep dialog"
   
4. Create the /opt folder if it doesn't already exist "mkdir /opt"
   
5. Now you need to create the user for the service: "adduser --system --shell /bin/bash --home /opt/minecraft --group minecraft"
   
6. Create the Systemd Unit file "nano /etc/systemd/system/[email protected]" : "curl https://raw.githubusercontent.com/FlamingPaw/MinecraftSystemdUnit/master/minecraft%40.service > /etc/systemd/system/[email protected]"
   

Now you can Upload your FTB Modpacks into an subfolder of /opt/minecraft/. For example you would place the modpack "FTB Beyond" in "/opt/minecraft/FTBBeyond" (without spaces in the name).

If you want to run vanilla instances, just create a folder within /opt/minecraft and upload the minecraft_server.jar and create the eula.txt file (using: echo "eula=true" > /opt/minecraft/vanilla/eula.txt).

After you uploaded the minecraft server files, make sure, that "minecraft" is the owner and owning group. To do so just run "ls -la /opt/minecraft". If it is not, run "chown minecraft:minecraft /opt/minecraft".
You may also require to complete the installation. For current FTB packages you would run:

cd /opt/minecraft/FTBBeyond
echo "eula=true" > /opt/minecraft/FTBBeyond/eula.txt
su -c "/opt/minecraft/FTBBeyond/FTBInstall.sh" -s "/bin/bash" minecraft

systemctl enable minecraft@FTBBeyond

systemctl disable minecraft@FTBBeyond

systemctl start minecraft@FTBBeyond

systemctl stop minecraft@FTBBeyond

To connect to the console to enter commands, run the minecraftConsole.sh interactive script.
Note: To detach (exit) screen press [STRG] + [A] followed by [D].

./minecraftServerManager.sh