Minecraft Server Setup Guide

# Update system packages
sudo apt update && sudo apt upgrade -y

# Install Java 17 (recommended for newer MC versions)
sudo apt install openjdk-17-jre-headless -y

# Install screen for background processes
sudo apt install screen -y

# Create minecraft user
sudo useradd -m -d /opt/minecraft -s /bin/bash minecraft

# Switch to minecraft user
sudo su - minecraft

# Create server directory
mkdir ~/server
cd ~/server

# Download latest server jar (replace URL with current version)
wget https://launcher.mojang.com/v1/objects/c8f83c5655308435b3dcf03c06d9fe8740a77469/server.jar

# Create start script
cat > start.sh << 'EOF'
#!/bin/bash
java -Xmx4G -Xms1G -jar server.jar nogui
EOF

chmod +x start.sh

# First run to generate files
./start.sh

# Accept EULA
echo "eula=true" > eula.txt

# Basic server.properties settings
server-port=25565
server-ip=0.0.0.0
online-mode=true
max-players=20
motd=§aMrFaws Minecraft Server
difficulty=normal
gamemode=survival
pvp=true
spawn-protection=16
view-distance=10
simulation-distance=10

# Create BungeeCord directory
mkdir ~/bungee
cd ~/bungee

# Download BungeeCord
wget https://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/BungeeCord.jar

# Create start script
cat > start.sh << 'EOF'
#!/bin/bash
java -Xmx512M -jar BungeeCord.jar
EOF

chmod +x start.sh

# config.yml
player_limit: 100
ip_forward: true
prevent_proxy_connections: false
online_mode: true

servers:
  lobby:
    motd: '&aLobby Server'
    address: localhost:25566
    restricted: false
  survival:
    motd: '&bSurvival Server'
    address: localhost:25567
    restricted: false
  creative:
    motd: '&eCreative Server'
    address: localhost:25568
    restricted: false

listeners:
- query_port: 25577
  motd: '&aMrFaws Network'
  tab_list: GLOBAL_PING
  query_enabled: false
  proxy_protocol: false
  forced_hosts:
    pvp.example.com: pvp
  ping_passthrough: false
  priorities:
  - lobby
  bind_local_address: true
  host: 0.0.0.0:25565
  max_players: 100
  tab_size: 60
  force_default_server: false

# server.properties for backend servers
online-mode=false
server-port=25566  # Different for each server
bungeecord=true

# /etc/nginx/nginx.conf
stream {
    upstream minecraft_backend {
        server 127.0.0.1:25565 weight=1 max_fails=3 fail_timeout=10s;
        server 127.0.0.1:25566 weight=1 max_fails=3 fail_timeout=10s backup;
    }

    server {
        listen 25565;
        proxy_pass minecraft_backend;
        proxy_timeout 1s;
        proxy_responses 1;
        error_log /var/log/nginx/minecraft.log;
    }

    # BungeeCord load balancing
    upstream bungee_backend {
        least_conn;
        server 127.0.0.1:25565;
        server 127.0.0.1:25575;
    }

    server {
        listen 25577;
        proxy_pass bungee_backend;
        proxy_timeout 1s;
        proxy_responses 1;
    }
}

# /etc/haproxy/haproxy.cfg
global
    daemon
    maxconn 4096

defaults
    mode tcp
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms

frontend minecraft_frontend
    bind *:25565
    default_backend minecraft_servers

backend minecraft_servers
    balance roundrobin
    option tcp-check
    server mc1 127.0.0.1:25566 check
    server mc2 127.0.0.1:25567 check backup

# UFW firewall rules
sudo ufw enable
sudo ufw allow ssh
sudo ufw allow 25565/tcp  # Minecraft
sudo ufw allow 25577/tcp  # BungeeCord
sudo ufw allow 8123/tcp   # Dynmap (if used)

# Rate limiting for DDoS protection
sudo ufw limit 25565/tcp

# Advanced DDoS protection
sudo iptables -A INPUT -p tcp --dport 25565 -m connlimit --connlimit-above 5 -j DROP
sudo iptables -A INPUT -p tcp --dport 25565 -m recent --set --name minecraft
sudo iptables -A INPUT -p tcp --dport 25565 -m recent --update --seconds 60 --hitcount 10 --name minecraft -j DROP

# Save rules
sudo iptables-save > /etc/iptables/rules.v4

# /etc/fail2ban/jail.local
[minecraft]
enabled = true
port = 25565
filter = minecraft
logpath = /opt/minecraft/server/logs/latest.log
maxretry = 5
bantime = 3600
findtime = 600

# Optimized start script
#!/bin/bash
java -Xmx8G -Xms8G \
     -XX:+UseG1GC \
     -XX:+ParallelRefProcEnabled \
     -XX:MaxGCPauseMillis=200 \
     -XX:+UnlockExperimentalVMOptions \
     -XX:+DisableExplicitGC \
     -XX:+AlwaysPreTouch \
     -XX:G1NewSizePercent=30 \
     -XX:G1MaxNewSizePercent=40 \
     -XX:G1HeapRegionSize=8M \
     -XX:G1ReservePercent=20 \
     -XX:G1HeapWastePercent=5 \
     -XX:G1MixedGCCountTarget=4 \
     -XX:InitiatingHeapOccupancyPercent=15 \
     -XX:G1MixedGCLiveThresholdPercent=90 \
     -XX:G1RSetUpdatingPauseTimePercent=5 \
     -XX:SurvivorRatio=32 \
     -XX:+PerfDisableSharedMem \
     -XX:MaxTenuringThreshold=1 \
     -Dusing.aikars.flags=https://mcflags.emc.gs \
     -Daikars.new.flags=true \
     -jar server.jar nogui

# bukkit.yml optimizations
settings:
  allow-end: true
  warn-on-overload: true
  permissions-file: permissions.yml
  update-folder: update
  plugin-profiling: false
  connection-throttle: 4000
  query-plugins: true
  deprecated-verbose: default
  shutdown-message: Server closed

spawn-limits:
  monsters: 70
  animals: 10
  water-animals: 15
  ambient: 15

chunk-gc:
  period-in-ticks: 600
  load-threshold: 0

ticks-per:
  animal-spawns: 400
  monster-spawns: 1
  autosave: 6000

# paper.yml performance settings
world-settings:
  default:
    max-auto-save-chunks-per-tick: 24
    optimize-explosions: true
    mob-spawner-tick-rate: 1
    game-mechanics:
      disable-chest-cat-detection: true
    anti-xray:
      enabled: true
      engine-mode: 1
      max-chunk-section-index: 3
      update-radius: 2
      lava-obscures: false
      use-permission: false

# Create log rotation script
cat > /opt/minecraft/rotate_logs.sh << 'EOF'
#!/bin/bash
cd /opt/minecraft/server/logs
gzip latest.log
mv latest.log.gz "minecraft-$(date +%Y%m%d).log.gz"
find . -name "*.log.gz" -mtime +30 -delete
EOF

# Add to crontab
echo "0 4 * * * /opt/minecraft/rotate_logs.sh" | crontab -

# Server monitoring script
#!/bin/bash
while true; do
    echo "$(date): Players online: $(screen -S minecraft -Q windows | wc -l)"
    echo "$(date): Memory usage: $(free -h | grep Mem | awk '{print $3}')"
    echo "$(date): CPU load: $(uptime | awk -F'load average:' '{print $2}')"
    echo "---"
    sleep 60
done > /opt/minecraft/monitor.log &