HOWTO: install java Minecraft server 1.14.4 on ubuntu 19.04

gistfile1.txt

#
#patch and update. Because it's what we do. 

sudo apt-get update && sudo apt-get dist-upgrade --yes

#install java.
sudo apt install openjdk-13-jre-headless

#To test:
java --version

# we gonna put your minecraft server bits in: /opt/minecraft/Survival 
# /opt was already there in my host, however, can never be sure: 

sudo mkdir /opt

#create a minecraft acct to run this under:
sudo adduser --system --shell /bin/bash --home /opt/minecraft --group minecraft

#create a folder for the jar file and reciprocal files itself:
sudo mkdir /opt/minecraft/Survival

Cd /opt/minecraft/Survival
# go get the latest java jar file from mojang. This one is as of 10/2019 v1.14.4:

wget -O minecraft_server.jar https://launcher.mojang.com/v1/objects/3dc3d84a581f14691199cf6831b71ed1296a9f$ 

#Prime the pump on your minecraft server:

java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui


# now go edit the eula:]. One of 2 ways: if you ran the server, you should have a eula.txt. Choose wisely:

## sudo nano eula.txt

# or if you want to live dangerously, do this instead. 
## sudo bash -c "echo eula=true > /opt/minecraft/survival/eula.txt" 

# Now would be a good time to check your server.properties.
# If you do not have one, it's coz you haven't run the java command like above yet to test it out! 

nano server.properties


# I like to test out my features a couple of times, just to make sure it's primed . Here's an example of pushing it to 4gb at start.

java -Xmx8192m -Xms4096m -jar minecraft_server.jar nogui

# i suggest opening a 2nd ssh session, and run 
# htop to see what's going on and confirm things are running as expected while you run the server manually.


# next section goes into what goes in the systemd startup config file:

sudo nano /etc/systemd/system/minecraft@.service

#copy/pasta this into that file, then save. 


			# Source: https://github.com/agowa338/MinecraftSystemdUnit/
			# License: MIT
			[Unit]
			Description=Minecraft Server %i
			After=network.target
			
			[Service]
			WorkingDirectory=/opt/minecraft/%i
			PrivateUsers=true
			# Users Database is not available for within the unit, only root and minecraft is available, everybody else is
			nobody
			User=minecraft
			Group=minecraft
			ProtectSystem=full
			# Read only mapping of /usr /boot and /etc
			ProtectHome=true
			# /home, /root and /run/user seem to be empty from within the unit. It is recommended to enable this setting fo
			r all long-running services (in particular network-facing ones).
			ProtectKernelTunables=true
			# /proc/sys, /sys, /proc/sysrq-trigger, /proc/latency_stats, /proc/acpi, /proc/timer_stats, /proc/fs and /proc/
			irq will be read-only within the unit. It is recommended to turn this on for most services.
			# Implies MountFlags=slave
			ProtectKernelModules=true
			# Block module system calls, also /usr/lib/modules. It is recommended to turn this on for most services that do
			 not need special file systems or extra kernel modules to work
			# Implies NoNewPrivileges=yes
			ProtectControlGroups=true
			# It is hence recommended to turn this on for most services.
			# Implies MountAPIVFS=yes
			
			ExecStart=/bin/sh -c '/usr/bin/screen -DmS mc-%i /usr/bin/java -Xms4096M -Xmx8192M -XX:+UseG1GC -XX:ParallelGCThreads=2 -jar $(ls -v | grep -i "FTBServer.*jar\|minecraft_server.*jar" | head -n 1) nogui'
			
			ExecReload=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "reload"\\015'
			
			ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "say SERVER SHUTTING DOWN. Saving map..."\\015'
			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'
			ExecStop=/bin/sleep 10
			
			Restart=on-failure
			RestartSec=60s
			
			[Install]
			WantedBy=multi-user.target
			
			#########
			# HowTo
			#########
			#
			# Create a directory in /opt/minecraft/XX where XX is a name like 'survival'
			# Add minecraft_server.jar into dir with other conf files for minecraft server
			#
			# Enable/Start systemd service
			#    systemctl enable minecraft@survival
			#    systemctl start minecraft@survival
			#
			# To run multiple servers simply create a new dir structure and enable/start it
			#    systemctl enable minecraft@creative
			# systemctl start minecraft@creative


# SAVE YOUR FILE 
# then fire up your vanilla survival mode world as such:
sudo systemctl start minecraft@Survival
sudo systemctl enable minecraft@Survival

# if it doesn't start, you can figure out what's going on with:
journalctl -u minecraft@Survival

#once it's all running, reboot, and confirm the world comes up after a reboot. 
#if all is good, congrats! go play!

# Now, if you want to let others play with it, go set up port forwarding for TCP & UDP on 25565 to the ip address of the minefcraft host. 
# If you want to go set up a vanity domain name, I suggest a combination of dnsomatic, openDNS and dynu for your dynamic name hosting service needs