Minecraft Setup On Linux Using systemctl

With schools and the economy shut down, all the cool kids are talking about their Minecraft "server" and the "IP. Help your children be cool and get them a Minecraft server!


In this posting we will:
- set up unix group and user
- configure ssh
- install Minecraft software
- start and configure Minecraft to run as a unix service (daemon)


$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:        18.04
Codename:       bionic


### Setup a user and group. In this example, the new users is "testuser" and the new group is "minec".
$ sudo addgroup minec
$ cat /etc/group | grep minec

# Create new user for the software install.
$ sudo adduser minec --ingroup minec
# At this point, you may want to log in as the user and run command "groups" to confirm the group is set up appropriately.

# Allow logon via ssh. Put user in /etc/ssh/sshd_config on the "AllowUsers" line
# Use "vi" or "vim" or similar editor to edit file /etc/ssh/sshd_config and add "testuser" to the "AllowUsers" line.
# After editing, it will look like this:
$ grep -i allowusers /etc/ssh/sshd_config
AllowUsers minec

# Have ssh  reread the configuration file. First get the process ID, then send HUP signal to that PID.
$ ps -ef | grep 'bin/sshd'$ sudo kill -hup <sshd_pid>
# Alternatively use service manager to restart ssh
$ sudo systemctl restart ssh


### If java is not installed, install java now.
$ which java
$ sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [107 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease [98.3 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Fetched 312 kB in 1s (252 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
$ sudo apt install openjdk-11-jdk
...
$ which java
/usr/bin/java


### Install Minecraft.
# Good instructions are at minecraft.gamepedia.com/Tutorials/Setting_up_a_server
# After downloading the software, the directory structure will look like this.
$ pwd
/home/minec/Minecraft_Server
$ ls -l
total 35368
-rw-r-----  1 minec minec        2 Apr  4 12:56 banned-ips.json
-rw-r-----  1 minec minec        2 Apr  4 12:56 banned-players.json
-rw-r-----  1 minec minec      180 Mar 29 19:21 eula.txt
drwxr-x---  2 minec minec     4096 Apr  5 09:55 logs
-rw-r-----  1 minec minec      140 Apr  4 12:56 ops.json
-rw-r-----  1 minec minec 36175593 Mar 29 19:01 server.jar
-rw-r-----  1 minec minec      940 Apr  4 12:56 server.properties
-rwxr-x---  1 minec minec       67 Apr  4 10:01 startminecraft.sh
-rw-r-----  1 minec minec     1645 Apr  5 16:13 usercache.json
-rw-r-----  1 minec minec        2 Mar 29 19:21 whitelist.json
drwxr-x--- 11 minec minec     4096 Apr  5 17:46 world

# In preparation for starting the server unattended, the startup commands are in the executable shell file "startminecraft.sh".
This script first backs up the Minecraft configuration.
If you want to run it from the console and watch the log in the GUI, run the java command without "-nogui".
#!/bin/sh
umask 026
cd /home/minec/Minecraft_Server
/bin/tar -cvf /tmp/worldDirs.$(date +%Y%m%d.%H%M%S).tar /home/minec/Minecraft_Server/world
echo "Finished tar of worldDirs."
/usr/bin/java -jar /home/minec/Minecraft_Server/server.jar -nogui &
/bin/echo $! > /home/minec/Minecraft_Server/minecraft.service.pid

# Set up the service. Create file /etc/systemd/system/minecraft.service with these contents.
$ cd /etc/systemd/system
$ sudo vi minecraft.service
[Unit]
Description=Minecraft server
After=network.target
[Service]
User=minec
Group=minec
ExecStart=/home/minec/Minecraft_Server/startminecraft.sh
#PIDFile=/var/run/minecraft.service.pid
#ExecStop=/bin/kill -s TERM $MAINPID
KillMode=process
Restart=on-failure
Type=forking
TimeoutStartSec=120
TimeoutStopSec=30
RuntimeMaxSec=infinity
[Install]
WantedBy=multi-user.target

# Reload systemctl configurations.
$ sudo systemctl daemon-reload
# Enable the service.
$ sudo systemctl enable minecraft.service
Created symlink /etc/systemd/system/multi-user.target.wants/minecraft.service → /etc/systemd/system/minecraft.service.
# If the prior line output is not "Created symlink ..." then something is not correct.

# Start the minecraft service.
$ sudo systemctl start minecraft.service
$ sudo systemctl status minecraft.service

# Restart the machine to test if the Minecraft server starts ok.
$ sudo reboot

# After the machine restarts, look in /var/log/syslog for messages, check the status of the service, and look for the process.
$ sudo tail -44 /var/log/syslog
$ ps -ef | grep mine

$ systemctl status minecraft.service
● minecraft.service - Minecraft server
   Loaded: loaded (/etc/systemd/system/minecraft.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-04-10 21:26:31 MDT; 3min 26s ago
  Process: 7622 ExecStart=/home/minec/Minecraft_Server/startminecraft.sh (code=exited, status=0/SUCCESS)
 Main PID: 7632 (java)
    Tasks: 36 (limit: 4915)
   CGroup: /system.slice/minecraft.service
           └─7632 /usr/bin/java -jar /home/minec/Minecraft_Server/server.jar -nogui

# You can stop the service. To prohibit the service from restarting upon machine reboot, also disable the service.

$ sudo systemctl stop minecraft.service
$ sudo systemctl disable minecraft.service
Removed /etc/systemd/system/multi-user.target.wants/minecraft.service.

Disable Windows 10 Netbios and SMB

On Microsoft Windows 10, SMB 1 should already be disabled. To enhance security, you may want to also disable SMB 1 and 2 and NetBIOS.

Open PowerShell as Administrator by pressing the Start button, typing powershell, and pressing Run As Administrator:

Read the Microsoft post about how to disable SMB. 

In PowerShell, get the setting and disable it with:
Get-SmbServerConfiguration | Select EnableSMB2Protocol
Set-SmbServerConfiguration -EnableSMB2Protocol $false

Disable SMB v1 in PowerShell with:
Disable-WindowsOptionalFeature -Online -FeatureName smb1protocol

If you see an error of "Access is denied", ensure you run PowerShell as Administrator.




To disable NetBIOS, in Control Panel go to Advanced TCP/IP Settings and press the radio button:

Uninstall Windows 10 Apps

Microsoft is aggressively pushing some unwanted applications during Windows 10 upgrades. Some of the applications may be uninstalled in Windows Settings --> Apps & features. Many can not be removed or uninstalled there.

It is possible to use the command line to uninstall some of these unwanted applications.

Press the Start button and type: windows powershell
Click on "Run as Administrator" to open the Power Shell.

To uninstall "Your Phone", in Power Shell type: Get-AppxPackage Microsoft.YourPhone -AllUsers | Remove-AppxPackage

To remove xbox, type: get-appxpackage -allusers *xboxapp* | Remove-AppxPackage
Three more lines to remove xbox are: get-appxprovisionedpackage –online | where-object {$_.packagename –like “*xboxapp*”} | remove-appxprovisionedpackage –online
And: get-appxpackage -allusers *xboxapp* | Remove-AppxPackage
And: get-appxprovisionedpackage –online | where-object {$_.packagename –like “*xboxapp*”} | remove-appxprovisionedpackage –online 
To remove the Xbox Game Bar application, type: get-appxpackage -allusers *xbox* | Remove-AppxPackage

To remove 3D Builder type: Get-AppxPackage *3dbuilder* | Remove-AppxPackage 
Also remove the 3D Viewer: Get-AppxPackage Microsoft.Microsoft3DViewer | Remove-AppxPackage

To remove the Camera application type: Get-AppxPackage *windowscamera* | Remove-AppxPackage

To remove Maps type: Get-AppxPackage *windowsmaps* | Remove-AppxPackage

To remove Microsoft's People app, type: Get-AppxPackage *people* | Remove-AppxPackage

If you want to re-install the applications, open the Windows Store from the Start menu and install the applications.

After the applications are removed, you may want to create a restore point. Press the Start button and type: restore point. Then Configure and Create a restore point.