Host a Minecraft - Java Edition Dedicated Server

# Update system and install Docker
sudo apt update && sudo apt install -y docker.io
sudo systemctl enable --now docker

# Create game server directory
sudo mkdir -p /opt/gameserver

# Server configuration
export GAMEMODE="survival"
export DIFFICULTY="easy"
export LEVEL_NAME="world"
export PVP="true"
export SPAWN_MONSTERS="true"
export WHITE_LIST="false"
export ALLOW_FLIGHT="false"
export SPAWN_PROTECTION="16"
export HARDCORE="false"
export FORCE_GAMEMODE="false"
export ALLOW_NETHER="true"
export LEVEL_TYPE="minecraft:normal"
export GENERATE_STRUCTURES="true"
export ONLINE_MODE="true"
export ENFORCE_WHITELIST="false"
export ENFORCE_SECURE_PROFILE="true"
export ENABLE_RCON="false"
export ENABLE_QUERY="true"
export ENABLE_STATUS="true"
export ENABLE_COMMAND_BLOCK="false"
export VIEW_DISTANCE="10"
export SIMULATION_DISTANCE="10"
export MAX_TICK_TIME="60000"
export NETWORK_COMPRESSION_THRESHOLD="256"

# Pull the container image
docker pull eclipse-temurin:21-jre-alpine

#!/bin/bash

apt update
apt install -y wget curl jq

cd /opt/gameserver || { echo "Failed to change directory to /opt/gameserver"; exit 1; }

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

# Resolve Minecraft version
MC_VERSION="${MINECRAFT_VERSION:-latest}"
MANIFEST_URL="https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"

echo "Fetching version manifest..."
MANIFEST=$(curl -sSL "$MANIFEST_URL")

if [ "$MC_VERSION" = "latest" ]; then
  MC_VERSION=$(echo "$MANIFEST" | jq -r '.latest.release')
  echo "Latest release version: $MC_VERSION"
else
  echo "Using specified version: $MC_VERSION"
fi

# Get version metadata URL
VERSION_URL=$(echo "$MANIFEST" | jq -r --arg v "$MC_VERSION" '.versions[] | select(.id == $v) | .url')

if [ -z "$VERSION_URL" ] || [ "$VERSION_URL" = "null" ]; then
  echo "ERROR: Version $MC_VERSION not found in Mojang manifest!"
  exit 1
fi

# Get server JAR download URL
echo "Fetching version metadata for $MC_VERSION..."
SERVER_JAR_URL=$(curl -sSL "$VERSION_URL" | jq -r '.downloads.server.url')

if [ -z "$SERVER_JAR_URL" ] || [ "$SERVER_JAR_URL" = "null" ]; then
  echo "ERROR: No server download found for version $MC_VERSION!"
  exit 1
fi

echo "Downloading Minecraft $MC_VERSION server JAR..."
wget -q "$SERVER_JAR_URL" -O server.jar
echo "Download completed."

echo "Install Completed"

sudo ufw allow 25565/tcp
sudo ufw allow 25575/tcp
sudo ufw allow 25566/both