A barebones Minecraft server run as a service

minecraft-server.service

[Unit]
Description=start and stop the minecraft-server 

[Service]
WorkingDirectory=/srv/minecraft-server
User=minecraft
Group=minecraft
Restart=on-failure
RestartSec=20 5

ExecStart=/usr/bin/screen -DmS minecraft /usr/bin/java -jar -Xms8000M -Xmx10000M server.jar nogui

ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTTING DOWN IN 15 SECONDS..."\015'
ExecStop=/bin/sleep 5
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTTING DOWN IN 10 SECONDS..."\015'
ExecStop=/bin/sleep 5
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "say SERVER SHUTTING DOWN IN 5 SECONDS..."\015'
ExecStop=/bin/sleep 5
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "save-all"\015'
ExecStop=/usr/bin/screen -p 0 -S minecraft -X eval 'stuff "stop"\015'

[Install]
WantedBy=multi-user.target

open_screen.sh

# Use ctrl-d + a to exit the screen without closing the server
su minecraft
# enter password; you know the one
screen -r
# OR, idk if this works, but the previosu one works if there is only one screen
screen -R minecraft

runServer.sh

java -jar -Xms2048m -Xmx3072m ./server.jar

server.properties

#Minecraft server properties
#Sun Jul 07 21:23:22 PDT 2019
broadcast-rcon-to-ops=true
view-distance=15
max-build-height=256
server-ip=
level-seed=-350501890505856
rcon.port=25575
server-port=25565
enable-command-block=true
gamemode=survival
allow-nether=true
enable-rcon=false
enable-query=false
op-permission-level=4
prevent-proxy-connections=false
generator-settings=
resource-pack=
player-idle-timeout=0
level-name=world
rcon.password=
motd=Freethinkers only
query.port=25565
force-gamemode=false
debug=false
hardcore=false
white-list=true
broadcast-console-to-ops=true
pvp=true
spawn-npcs=true
spawn-animals=true
generate-structures=true
snooper-enabled=true
difficulty=easy
network-compression-threshold=256
level-type=default
max-tick-time=60000
spawn-monsters=true
enforce-whitelist=true
max-players=10
use-native-transport=true
resource-pack-sha1=
spawn-protection=0
online-mode=true
allow-flight=true
max-world-size=29999984

setup.sh

# Adapted from https://minecraft.gamepedia.com/Tutorials/Ubuntu_startup_script
sudo adduser --system --home /srv/minecraft-server minecraft
sudo addgroup --system minecraft
sudo adduser minecraft minecraft # this adds user "minecraft" to the group "minecraft"

#sudo chown -R minecraft.minecraft /srv/minecraft-server 	# This was in the original guide
sudo chown -R minecraft:minecraft /srv/minecraft-server

sudo cp minecraft-server.service /etc/systemd/system/minecraft-server.service
sudo systemctl enable minecraft-server