Minecraft server(s) using systemd and screen.

README.md

Install

# Install dependencies
sudo yum install -y java-1.8.0-openjdk screen

# Create a new unprivileged user for minecraft
useradd -r -m -d /opt/minecraft minecraft

# Create the directory that will house our minecraft instances
sudo su --shell /bin/bash minecraft
mkdir instances
exit

# Copy the minecraft@.service file into the correct place.
sudo vi /etc/systemd/system/minecraft@.service

# Reload systemd units
sudo systemctl daemon-reload

Provision a new server

# Sudo into the minecraft user's shell
sudo su --shell /bin/bash minecraft

# Move into the instances directory
cd instances

# Create a new folder to house your instance
mkdir server1

# Install your minecraft instance, and make sure there is a minecraft_server.jar file.
# If you use Forge servers, you can use the following:
ln -s forge*.jar minecraft_server.jar

# Start and enable (start after boot) the server.
sudo systemctl start minecraft@server1
sudo systemctl enable minecraft@server1

minecraft@.service

[Unit]
Description=Minecraft Server: %i
After=network.target

[Service]
WorkingDirectory=/opt/minecraft/instances/%i

User=minecraft
Group=minecraft

Restart=always

ExecStart=/usr/bin/screen -DmS mc-%i /usr/bin/java -Xmx2G -jar minecraft_server.jar nogui

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

[Install]
WantedBy=multi-user.target