How to Install Minecraft Server on CentOS 7

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How to Install Minecraft Server on CentOS 7

Minecraft is one of the most popular games of all time. It is a sandbox video game about placing blocks and going on adventures.

In this tutorial, we’ll go through the steps necessary to install and configure Minecraft Server on CentOS 7. We’ll use Systemd to run the Minecraft server and the mcrcon utility for connecting to the running instance. We’ll also show you how to schedule automated server backups using a Cron job.

Prerequisites

The user you are logged in as must have sudo privileges to be able to install packages.

Install the packages required to build the mcrcon tool:

sudo yum install gitsudo yum group install "Development Tools"

Installing Java Runtime Environment

Minecraft requires Java 8 or greater. Because the Minecraft Server doesn’t need a graphical user interface, we’ll install the headless version of the openjdk. This version is more suitable for server applications since it has fewer dependencies and uses less system resources.

The installation of Java is pretty simple, just run:

sudo yum install java-1.8.0-openjdk-headless

Verify the installation by printing the Java version :

java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

Creating Minecraft User

Running services as Minecraft under the root user is not recommended for security reasons.

We’ll create a new system user and group minecraft with home directory /opt/minecraft that will run the Minecraft server:

sudo useradd -r -m -U -d /opt/minecraft -s /bin/bash minecraft

We are not going to set a password for this user. This is good security practice because this user will not be able to login via SSH. To change to the minecraft user you’ll need to be logged in to the server as root or user with sudo privileges.

Installing Minecraft on CentOS

Before starting with the installation process, make sure you switch to user minecraft:

sudo su - minecraft

Create three new directories inside the user home directory using the following command:

mkdir -p ~/{backups,tools,server}
  • The backups directory will store your server backup. You can later synchronize this directory to your remote backup server.
  • The tools directory will store the mcrcon client and the backup script.
  • The server directory will contain the actual Minecraft server and its data.

Downloading and Compiling mcrcon

RCON is a protocol that allows you to connect to the Minecraft servers and execute commands. mcron is RCON client built in C.

We’ll download the source code from GitHub and build the mcrcon binary.

Start by moving to the ~/tools directory and clone the Tiiffi/mcrcon repository from GitHub using the following command:

cd ~/tools && git clone https://github.com/Tiiffi/mcrcon.git

Once the repository is cloned, navigate to its directory:

cd ~/tools/mcrcon

Build the mcrcon utility using the GCC compiler :

gcc -std=gnu11 -pedantic -Wall -Wextra -O2 -s -o mcrcon mcrcon.c

When completed, test it by typing:

./mcrcon -h

The output will look something like this:

Usage: mcrcon [OPTIONS]... [COMMANDS]...
Sends rcon commands to Minecraft server.

Option:
  -h		Print usage
  -H		Server address
  -P		Port (default is 25575)
  -p		Rcon password
  -t		Interactive terminal mode
  -s		Silent mode (do not print received packets)
  -c		Disable colors
  -r		Output raw packets (debugging and custom handling)
  -v		Output version information

Server address, port and password can be set using following environment variables:
  MCRCON_HOST
  MCRCON_PORT
  MCRCON_PASS

Command-line options will override environment variables.
Rcon commands with arguments must be enclosed in quotes.

Example:
	mcrcon -H my.minecraft.server -p password "say Server is restarting!" save-all stop

mcrcon 0.6.1 (built: May 19 2019 23:39:16)
Report bugs to tiiffi_at_gmail_dot_com or https://github.com/Tiiffi/mcrcon/issues/

Downloading Minecraft Server

There are several Minecraft server mods like Craftbukkit or Spigot that allows you to add features (plugins) on your server and further customize and tweak the server settings. In this tutorial, we will install the latest Mojang’s official vanilla Minecraft server.

The latest Minecraft server’s Java archive file (JAR) is available for download from the Minecraft download page .

At the time of writing, the latest version is 1.14.1. Before continuing with the next step you should check the download page for a new version.

Run the following wget command to download the Minecraft jar file in the ~/server directory:

wget https://launcher.mojang.com/v1/objects/ed76d597a44c5266be2a7fcd77a8270f1f0bc118/server.jar -P ~/server

Configuring Minecraft Server

Navigate to the ~/server directory and start the Minecraft server:

cd ~/serverjava -Xmx1024M -Xms512M -jar server.jar nogui

When you start the server for the first time it executes some operations and creates the server.properties and eula.txt files and stops.

[14:33:44] [main/ERROR]: Failed to load properties from file: server.properties
[14:33:45] [main/WARN]: Failed to load eula.txt
[14:33:45] [main/INFO]: You need to agree to the EULA in order to run the server. Go to eula.txt for more info.

You’ll need to agree to the Minecraft EULA in order to run the server. Open the eula.txt file and change eula=false to eula=true:

nano ~/server/eula.txt
~/server/eula.txt
#By changing the setting below to TRUE you are indicating your agreement to our EULA (https://account.mojang.com/documents/minecraft_eula).
#Sun May 19 23:41:45 PDT 2019
eula=true

Close and save the file.

Next, open the server.properties file, enable the rcon protocol and set the rcon password:

nano ~/server/server.properties

Locate the following lines and update their values as shown below:

~/server/server.properties
rcon.port=25575
rcon.password=strong-password
enable-rcon=true
Do not forget to change the strong-password to something more secure. If you don’t want to connect to the Minecraft server from remote locations make sure the rcon port is blocked by your firewall.

While here, you can also adjust the server’s default properties. For more information about the possible settings visit the server.properties page.

Creating Systemd Unit File

To run Minecraft as a service we will create a new Systemd unit file.

Switch back to your sudo user by typing exit.

Open your text editor and create a file named minecraft.service in the /etc/systemd/system/:

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

Paste the following configuration:

/etc/systemd/system/minecraft.service
[Unit]
Description=Minecraft Server
After=network.target

[Service]
User=minecraft
Nice=1
KillMode=none
SuccessExitStatus=0 1
ProtectHome=true
ProtectSystem=full
PrivateDevices=true
NoNewPrivileges=true
WorkingDirectory=/opt/minecraft/server
ExecStart=/usr/bin/java -Xmx1024M -Xms512M -jar server.jar nogui
ExecStop=/opt/minecraft/tools/mcrcon/mcrcon -H 127.0.0.1 -P 25575 -p strong-password stop

[Install]
WantedBy=multi-user.target

Modify the Xmx and Xms flags according to your server resources. The Xmx flag defines the maximum memory allocation pool for a Java virtual machine (JVM), while Xms defines the initial memory allocation pool. Also, make sure that you are using the correct rcon port and password.

Save and close the file and notify systemd that we created a new unit file:

sudo systemctl daemon-reload

Now you can start the Minecraft server by executing:

sudo systemctl start minecraft

The fist time you start the service it will generate several configuration files and directories including the Minecraft world.

Check the service status with the following command:

sudo systemctl status minecraft
● minecraft.service - Minecraft Server
   Loaded: loaded (/etc/systemd/system/minecraft.service; disabled; vendor preset: disabled)
   Active: active (running) since Sun 2019-05-19 23:49:18 PDT; 9min ago
 Main PID: 17356 (java)
   CGroup: /system.slice/minecraft.service
           └─17356 /usr/bin/java -Xmx1024M -Xms512M -jar server.jar nogui --noconsole

Enable the Minecraft service to be automatically started at boot time:

sudo systemctl enable minecraft

Adjusting Firewall

If your server is protected by a firewall to access Minecraft server from the outside of your local network you need to open port 25565:

sudo firewall-cmd --permanent --zone=public --add-port=25565/tcpsudo firewall-cmd --reload

Configuring Backups

In this section, we’ll create a backup script and cronjob to automatically backup the Minecraft server.

Start by switching to minecraft user:

sudo su - minecraft

Open your text editor and create the following file:

nano /opt/minecraft/tools/backup.sh

Paste the following configuration:

/opt/minecraft/tools/backup.sh
#!/bin/bash

function rcon {
  /opt/minecraft/tools/mcrcon/mcrcon -H 127.0.0.1 -P 25575 -p strong-password "$1"
}

rcon "save-off"
rcon "save-all"
tar -cvpzf /opt/minecraft/backups/server-$(date +%F-%H-%M).tar.gz /opt/minecraft/server
rcon "save-on"

## Delete older backups
find /opt/minecraft/backups/ -type f -mtime +7 -name '*.gz' -delete

Make the script executable by issuing the following chmod command:

chmod +x /opt/minecraft/tools/backup.sh

Open the crontab file and create a cronjob that will run once in a day automatically at a fixed time:

crontab -e

We’ll run the backup script every day at 23:00h:

0 23 * * * /opt/minecraft/tools/backup.sh

Accessing Minecraft Console

To access the Minecraft Console you can use the mcrcon utility.

The syntax is as follows, you need to specify the host, rcon port, rcon password and use the -t switch that enables the mcrcon terminal mode:

/opt/minecraft/tools/mcrcon/mcrcon -H 127.0.0.1 -P 25575 -p strong-password -t
Logged in. Type "Q" to quit!
>

If you are regularly connecting to the Minecraft console, instead of typing this long command you should create a bash alias .

Conclusion

You have successfully installed Minecraft server on your CentOS 7 system and set up a daily backup.

If you hit a problem or have feedback, leave a comment below.

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