From 57a128d6082d235eed1b1ce1918e0a14f5efc595 Mon Sep 17 00:00:00 2001 From: admin9webs Date: Fri, 10 Jul 2026 16:10:20 +0800 Subject: [PATCH] Add gaming/minecraft-modpack-server --- .../gaming/minecraft-modpack-server/SKILL.md | 187 ++++++++++++++++++ 1 file changed, 187 insertions(+) create mode 100644 skills/gaming/minecraft-modpack-server/SKILL.md diff --git a/skills/gaming/minecraft-modpack-server/SKILL.md b/skills/gaming/minecraft-modpack-server/SKILL.md new file mode 100644 index 0000000..0164f7e --- /dev/null +++ b/skills/gaming/minecraft-modpack-server/SKILL.md @@ -0,0 +1,187 @@ +--- +name: minecraft-modpack-server +description: "Host modded Minecraft servers (CurseForge, Modrinth)." +tags: [minecraft, gaming, server, neoforge, forge, modpack] +platforms: [linux, macos] +--- + +# 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 "" +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" +``` +Check with: `sudo ufw status | grep 25565` + +### 8. Create Launch Script +```bash +cat > ~/start-minecraft.sh << 'EOF' +#!/bin/bash +cd ~/minecraft-server/server +java @user_jvm_args.txt @libraries/net/neoforged/neoforge//unix_args.txt nogui +EOF +chmod +x ~/start-minecraft.sh +``` +Note: For Forge (not NeoForge), the args file path differs. Check `startserver.sh` for the exact path. + +### 9. Set Up Automated Backups +Create backup script: +```bash +cat > ~/minecraft-server/backup.sh << 'SCRIPT' +#!/bin/bash +SERVER_DIR="$HOME/minecraft-server/server" +BACKUP_DIR="$HOME/minecraft-server/backups" +WORLD_DIR="$SERVER_DIR/world" +MAX_BACKUPS=24 +mkdir -p "$BACKUP_DIR" +[ ! -d "$WORLD_DIR" ] && echo "[BACKUP] No world folder" && exit 0 +TIMESTAMP=$(date +%Y-%m-%d_%H-%M-%S) +BACKUP_FILE="$BACKUP_DIR/world_${TIMESTAMP}.tar.gz" +echo "[BACKUP] Starting at $(date)" +tar -czf "$BACKUP_FILE" -C "$SERVER_DIR" world +SIZE=$(du -h "$BACKUP_FILE" | cut -f1) +echo "[BACKUP] Saved: $BACKUP_FILE ($SIZE)" +BACKUP_COUNT=$(ls -1t "$BACKUP_DIR"/world_*.tar.gz 2>/dev/null | wc -l) +if [ "$BACKUP_COUNT" -gt "$MAX_BACKUPS" ]; then + REMOVE=$((BACKUP_COUNT - MAX_BACKUPS)) + ls -1t "$BACKUP_DIR"/world_*.tar.gz | tail -n "$REMOVE" | xargs rm -f + echo "[BACKUP] Pruned $REMOVE old backup(s)" +fi +echo "[BACKUP] Done at $(date)" +SCRIPT +chmod +x ~/minecraft-server/backup.sh +``` + +Add hourly cron: +```bash +(crontab -l 2>/dev/null | grep -v "minecraft/backup.sh"; echo "0 * * * * $HOME/minecraft-server/backup.sh >> $HOME/minecraft-server/backups/backup.log 2>&1") | crontab - +``` + +## Pitfalls +- ALWAYS set `allow-flight=true` for modded — mods with jetpacks/flight will kick players otherwise +- `max-tick-time=180000` or higher — modded servers often have long ticks during worldgen +- First startup is SLOW (several minutes for big packs) — don't panic +- "Can't keep up!" warnings on first launch are normal, settles after initial chunk gen +- If online-mode=false, set enforce-secure-profile=false too or clients get rejected +- The pack's startserver.sh often has an auto-restart loop — make a clean launch script without it +- Delete the world/ folder to regenerate with a new seed +- Some packs have env vars to control behavior (e.g., ATM10 uses ATM10_JAVA, ATM10_RESTART, ATM10_INSTALL_ONLY) + +## Verification +- `pgrep -fa neoforge` or `pgrep -fa minecraft` to check if running +- Check logs: `tail -f ~/minecraft-server/server/logs/latest.log` +- Look for "Done (Xs)!" in the log = server is ready +- Test connection: player adds server IP in Multiplayer