Minecraft Linux Start Up

README.md

To Run

chmod +x start-minecraft.sh
./start-minecraft.sh

start-minecraft.sh

#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

echo "================================"
echo "Minecraft Server Setup"
echo "================================"
echo

if ! command -v java >/dev/null 2>&1; then
    echo "Java is not installed or not in PATH."
    echo "Install Java 21 or later, then run this again."
    exit 1
fi

if ! command -v curl >/dev/null 2>&1; then
    echo "curl is not installed."
    echo "Install curl, then run this again."
    exit 1
fi

if ! command -v python3 >/dev/null 2>&1; then
    echo "python3 is not installed."
    echo "Install python3, then run this again."
    exit 1
fi

echo "Downloading latest Minecraft server..."

MANIFEST_URL="https://launchermeta.mojang.com/mc/game/version_manifest.json"
MANIFEST_JSON="$(curl -fsSL "$MANIFEST_URL")"

LATEST_VERSION="$(
    printf '%s' "$MANIFEST_JSON" | python3 -c '
import sys, json
data = json.load(sys.stdin)
print(data["latest"]["release"])
'
)"

VERSION_URL="$(
    printf '%s' "$MANIFEST_JSON" | python3 -c "
import sys, json
data = json.load(sys.stdin)
target = \"$LATEST_VERSION\"
for version in data[\"versions\"]:
    if version[\"id\"] == target:
        print(version[\"url\"])
        break
"
)"

VERSION_JSON="$(curl -fsSL "$VERSION_URL")"

SERVER_URL="$(
    printf '%s' "$VERSION_JSON" | python3 -c '
import sys, json
data = json.load(sys.stdin)
print(data["downloads"]["server"]["url"])
'
)"

curl -fL "$SERVER_URL" -o server.jar

echo "Download complete!"
echo

if [ ! -f "server.properties" ]; then
    echo "Creating server.properties..."
    cat > server.properties <<'EOF'
server-ip=0.0.0.0
server-port=25565
online-mode=true
max-players=25
level-name=white
gamemode=survival
difficulty=normal
spawn-protection=16
enable-command-block=false
EOF
else
    echo "Updating server-ip in existing server.properties..."
    if grep -q '^server-ip=' server.properties; then
        sed -i 's/^server-ip=.*/server-ip=0.0.0.0/' server.properties
    else
        printf '\nserver-ip=0.0.0.0\n' >> server.properties
    fi
fi

echo
echo "================================"
echo "Starting Minecraft Server"
echo "================================"
echo "Server will be accessible on 0.0.0.0:25565"
echo

cat > eula.txt <<'EOF'
#By changing the setting below to TRUE you are indicating your agreement to our EULA (https://aka.ms/MinecraftEULA).
eula=true
EOF

if [ ! -s ops.json ]; then
cat > ops.json <<'EOF'
[
  {
    "uuid": "3936ad41-5295-46f0-8185-0b8a06cffa97",
    "name": "ShibikoX",
    "level": 4,
    "bypassesPlayerLimit": true
  }
]
EOF
fi

# 8GB RAM
# java -Xmx8G -Xms4G -jar server.jar nogui

# 12GB RAM
java -Xmx12G -Xms6G -jar server.jar nogui

# 16GB RAM
# java -Xmx16G -Xms8G -jar server.jar nogui