minecraft-modpack-server

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• SKILL.md

SKILL.md (first lines)

# Minecraft Modpack Server Setup

## When to use
- User wants to set up a modded Minecraft server from a server pack zip
- User needs help with NeoForge/Forge server configuration
- User asks about Minecraft server performance tuning or backups

## Gather User Preferences First
Before starting setup, ask the user for:
- **Server name / MOTD** — what should it say in the server list?
- **Seed** — specific seed or random?
- **Difficulty** — peaceful / easy / normal / hard?
- **Gamemode** — survival / creative / adventure?
- **Online mode** — true (Mojang auth, legit accounts) or false (LAN/cracked friendly)?
- **Player count** — how many players expected? (affects RAM & view distance tuning)
- **RAM allocation** — or let agent decide based on mod count & available RAM?
- **View distance / simulation distance** — or let agent pick based on player count & hardware?
- **PvP** — on or off?
- **Whitelist** — open server or whitelist only?
- **Backups** — want automated backups? How often?

Use sensible defaults if the user doesn't care, but always ask before generating the config.

## Steps

### 1. Download & Inspect the Pack
```bash
mkdir -p ~/minecraft-server
cd ~/minecraft-server
wget -O serverpack.zip "<URL>"
unzip -o serverpack.zip -d server
ls server/
```
Look for: `startserver.sh`, installer jar (neoforge/forge), `user_jvm_args.txt`, `mods/` folder.
Check the script to determine: mod loader type, version, and required Java version.

### 2. Install Java
- Minecraft 1.21+ → Java 21: `sudo apt install openjdk-21-jre-headless`
- Minecraft 1.18-1.20 → Java 17: `sudo apt install openjdk-17-jre-headless`
- Minecraft 1.16 and below → Java 8: `sudo apt install openjdk-8-jre-headless`
- Verify: `java -version`

### 3. Install the Mod Loader
Most server packs include an install script. Use the INSTALL_ONLY env var to install without launching:
```bash
cd ~/minecraft-server/server
ATM10_INSTALL_ONLY=true bash startserver.sh
# Or for generic Forge packs:
# java -jar forge-*-installer.jar --installServer
```
This downloads libraries, patches the server jar, etc.

### 4. Accept EULA
```bash
echo "eula=true" > ~/minecraft-server/server/eula.txt
```

### 5. Configure server.properties
Key settings for modded/LAN:
```properties
motd=\u00a7b\u00a7lServer Name \u00a7r\u00a78| \u00a7aModpack Name
server-port=25565
online-mode=true          # false for LAN without Mojang auth
enforce-secure-profile=true  # match online-mode
difficulty=hard            # most modpacks balance around hard
allow-flight=true          # REQUIRED for modded (flying mounts/items)
spawn-protection=0         # let everyone build at spawn
max-tick-time=180000       # modded needs longer tick timeout
enable-command-block=true
```

Performance settings (scale to hardware):
```properties
# 2 players, beefy machine:
view-distance=16
simulation-distance=10

# 4-6 players, moderate machine:
view-distance=10
simulation-distance=6

# 8+ players or weaker hardware:
view-distance=8
simulation-distance=4
```

### 6. Tune JVM Args (user_jvm_args.txt)
Scale RAM to player count and mod count. Rule of thumb for modded:
- 100-200 mods: 6-12GB
- 200-350+ mods: 12-24GB
- Leave at least 8GB free for the OS/other tasks

```
-Xms12G
-Xmx24G
-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
```

### 7. Open Firewall
```bash
sudo ufw allow 25565/tcp comment "Minecraft Server"
```

From Tommy-yw/RunbookHermes, MIT.

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