SystemCTL & user update for MC Servers

[lx78WyY0J5]

Add a user per server

Stop using screen & replace by full SystemCTL usage : https://www.youtube.com/watch?v=B6XcbvTiiG8

journalctl -fu <SERVICE> to get log data

test restart function inside spigot to match start system (Should point to start script)

Exemple

[Unit]
Description= MinecraftTest Service

[Service]
User=minecraft
Group=minecraft
WorkingDirectory=/opt/mc1
ExecStart=/usr/bin/java -Xms128M -Xmx6500M -jar /opt/mc1/server.jar nogui <REPLACE WITH START SCRIPT PATH LIKE PREVIOUS SYSTEMCTL CONF>
RestartSec=10
Restart=always

[Install]
WantedBy=multi-user.target

Script path : Prev SystemCTL : https://github.com/Altherneum/server/blob/main/scripts/minecraft.service

Also move SystemCTL from /scripts to the real systemCTL path /etc/systemd/system/<NAME>.service

Nice tutorial for ref to add later on doc : https://www.youtube.com/watch?v=-C_lyhfUuhc

Add a socket for this service like shown here : https://unix.stackexchange.com/a/612118

To run a vanilla minecraft server, create /etc/systemd/system/minecraft.service with this content:

[Unit]
Description=Minecraft Server

[Service]
Type=simple
WorkingDirectory=/home/minecraft
ExecStart=java -Xmx1024M -Xms1024M -jar /home/minecraft/server.jar nogui
User=minecraft
Restart=on-failure

[Install]
WantedBy=multi-user.target

Set it to launch automatically after boot with systemctl enable minecraft.

You asked about how to control it:

$ sudo systemctl start minecraft   # Starts the service if it wasn't running
$ sudo systemctl stop minecraft    # Stops the service
$ sudo systemctl restart minecraft # Restarts the service
$ sudo systemctl status minecraft  # Find out how the service is doing
$ sudo journalctl -u minecraft -f  # Monitor the logs

This does everything except give you a means to send commands to the console. To do that, we'll set up a file that the server will listen to where you can write your commands by creating the following systemd units:

/etc/systemd/system/minecraft.socket:

[Unit]
PartOf=minecraft.service

[Socket]
ListenFIFO=%t/minecraft.stdin
and /etc/systemd/system/minecraft.service:

[Unit]
Description=Minecraft Server

[Service]
Type=simple
WorkingDirectory=/home/minecraft
ExecStart=java -Xmx1024M -Xms1024M -jar /home/minecraft/server.jar nogui
User=minecraft
Restart=on-failure
Sockets=minecraft.socket
StandardInput=socket
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=multi-user.target

Now you can send console commands by echoing stuff into that file:

echo "help" > /run/minecraft.stdin
echo "/stop" > /run/minecraft.stdin

What's also cool is that you can make your own custom sequences of commands and cat the entire file into the console. For example, if you play [UHC](https://gist.github.com/stolksdorf/5936212), you can start a new world, have people log-in, then cat uhc.commands > /run/minecraft.stdin to set the gamerules, spread the players, and start the event.

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[edited Feb 26, 2024 at 7:48](https://unix.stackexchange.com/posts/612118/revisions)
answered Sep 30, 2020 at 7:01
[Stewart](https://unix.stackexchange.com/users/272848/stewart)'s user avatar
Stewart

[lx78WyY0J5]

Already done

• Each server got a service
• Still using screen but its OK

Needed

Doc : journalctl -fu
doc : service socket