Tutorials/Ubuntu startup script

This is a simple startup-script for the upstart mechanism used by ubuntu-servers. It won't give you a console, which isn't consider a problem since there's an in game console anyway. It also doesn't update Minecraft.

Note: It's working fine in Ubuntu 14.

Further note: This configuration syntax is for the "upstart" process management system. Since 15.04, Ubuntu has moved to systemd, so you may need to explore other, systemd based options on newer Ubuntu installs. An example is below.

Prerequisites
sudo adduser --system --home /srv/minecraft-server minecraft sudo addgroup --system minecraft sudo adduser minecraft minecraft # this adds user "minecraft" to the group "minecraft"
 * Set up a user and group for minecraft so that it doesn't run as root

sudo chown -R minecraft.minecraft /srv/minecraft-server sudo nano /etc/init/minecraft-server.conf
 * Hand your server-installation over to your new user, for example, in /srv/minecraft-server
 * Create and edit the start/stop script creating a new file under /etc/init/minecraft-server (NOT /etc/init.d but /etc/init (without the .d) ) make sure that you save the file as minecraft-server.conf

and pasting the following into it. Don't forget to change the directory after "chdir" to your installation.
 * 1) description "start and stop the minecraft-server"

start on runlevel [2345] stop on runlevel [^2345]

console log chdir YOUR_INSTALLATION_DIRECTORY setuid minecraft setgid minecraft

respawn respawn limit 20 5

exec /usr/bin/java -Xms1536M -Xmx2048M -jar minecraft_server.jar nogui

Above Explained (Note, this script isn't usable.):
 * 1) description "start and stop the minecraft-server" <-- Adds a tip to what this script does.

start on runlevel [2345] <-- Tells Ubuntu when to start the server. Runlevels 2, 3, 4, and 5 are the "normal operation". stop on runlevel [^2345] <-- Tells Ubuntu when to stop the server. The ^ means NOT.

console log <-- Logs the actions taken chdir YOUR_INSTALLATION_DIRECTORY <-- Changes the active directory to the installation dir. setuid minecraft <-- Sets the UserID to "minecraft" (acts like Minecraft user) setgid minecraft <-- Sets the GroupID to "minecraft" (acts like Minecraft group)

respawn <-- Allows the program to "respawn" (restart) when it dies unexpectedly. respawn limit 20 5 <-- Allows the program to "respawn" 20 times in 5 seconds.

exec /usr/bin/java -Xms1536M -Xmx2048M -jar minecraft_server.jar nogui <-- Below... 'exec' > Executes command '/usr/bin/java' > Invokes Java. '-Xms1536M' > Sets minimum allocated memory limit. '-Xmx2048M' > Sets MAXIMUM allowable memory limit. '-jar minecraft-server.jar' > Tells Java to run the jarfile minecraft_server.jar 'nogui' > Tells minecraft-server.jar to run without a GUI. (Graphical screen).


 * Following step does not work since depcrication of upstart in ubuntu 16+

sudo initctl reload-configuration If you get an error saying the file does not exsist, try moving the minecraft-server file to /etc/init.d/ Also, if after running sudo start minecraft-server says that they is no job for it, try running "sudo /etc/init.d/minecraft-server start"
 * Now, install the start/stop to the default runlevels by running

Usage
sudo start minecraft-server sudo stop minecraft-server
 * To start the server
 * to stop the server

Troubles?
You can check the server log by using: sudo tail /var/log/upstart/minecraft-server.log

If that doesn't help, just contact me: User:Cel1ne

With systemd
In this example, the player has created a user, as chown by Cel1ne.

After : sudo gedit /etc/systemd/system/minecraft-server.service inside : [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/java -Xms1536M -Xmx1536M -jar minecraft_server.jar nogui [Install] WantedBy=multi-user.target To start the service : sudo service minecraft-server start To start after boot: sudo systemctl enable minecraft-server View the status ("q" to go out of the view): systemctl status minecraft-server.service

If you would like to interact with the server from your keyboard, you may use an alternative service configuration like this: [Unit] Description=minecraft-server [Service] WorkingDirectory=/home/minecraft/server User=minecraft Group=minecraft Type=forking ExecStart=/usr/bin/screen -h 2048 -dmS minecraft /usr/bin/java -Xms1536M -Xmx1536M -jar minecraft_server.jar nogui [Install] WantedBy=multi-user.target

If you have changed the service file, you should issue the sudo systemctl daemon-reload command to update the system.