All the Mods 9 is a comprehensive modpack requiring at least 6GB RAM and Java 17+. Ensure your server meets these requirements before starting.

System Requirements

Verify your server meets the minimum requirements for ATM9:

RAM: Minimum 6GB, recommended 8GB+
Java Version: Java 17 or higher
Disk Space: At least 5GB free space
CPU: Multi-core processor recommended

java -version

If you need Java 17, download from Adoptium.net

Download ATM9 Server Files

Get the official server files from the ATM9 developers:

Visit CurseForge ATM9 page
Click "Files" tab
Find the latest version and click "Download"
Look for "Server Pack" in the additional files section
Download the server files (usually a .zip file)

Always download from official sources to avoid modified or malicious files.

Extract and Setup Server Files

Prepare your server directory with the downloaded files:

Create a new directory for your ATM9 server
Extract the downloaded server pack into this directory
Ensure these key files are present:
- forge-server.jar (or similar)
- mods/ folder with all mod files
- config/ folder with configurations
- startserver.bat (Windows) or startserver.sh (Linux/Mac)

Configure Java Memory Allocation

Modify the startup script to allocate appropriate memory:

For Windows (startserver.bat):

java -Xmx8G -Xms8G -jar forge-server.jar nogui

For Linux/Mac (startserver.sh):

#!/bin/bash
java -Xmx8G -Xms8G -jar forge-server.jar nogui

Replace 8G with your desired RAM allocation (minimum 6G recommended).

Accept EULA and Initial Setup

Complete the initial server setup process:

Run the startup script once to generate initial files
The server will stop and create eula.txt
Open eula.txt and change eula=false to eula=true
Save the file

The first startup may take 5-10 minutes as Forge initializes and generates world files.

Configure Server Properties

Optimize server settings for ATM9 in server.properties:

# ATM9 Recommended Settings
server-port=25565
max-players=10
view-distance=8
simulation-distance=8
difficulty=normal
spawn-protection=0
enable-command-block=true
max-world-size=10000

# Performance settings for modded
network-compression-threshold=256
entity-broadcast-range-percentage=100

Configure Mod-Specific Settings

Adjust important mod configurations for optimal performance:

FTB Chunks (config/ftbchunks/ftbchunks-server.snbt):

max_claimed_chunks: 100
max_force_loaded_chunks: 25

JourneyMap (config/journeymap-server.toml):

enabled = true
op_commands = true

Start Your ATM9 Server

Launch your configured server:

Run your startup script (startserver.bat or startserver.sh)
Wait for the server to fully load (look for "Done!" message)
Test the connection by joining with your ATM9 client

Initial world generation may take 10-15 minutes. Be patient and don't force-stop the server during this process.

Client Installation for Players

Provide these instructions to your players:

Install CurseForge launcher
Search for "All the Mods 9" in the modpacks section
Install the exact same version as your server
Launch the modpack and connect to your server IP

Version mismatches between client and server will prevent connections. Ensure all players use the same ATM9 version.

Performance Optimization

Additional optimizations for smooth gameplay:

Backup regularly: ATM9 worlds can become complex quickly
Monitor TPS: Use /forge tps to check server performance
Limit chunk loading: Configure FTB Chunks to prevent excessive loaded chunks
Disable unnecessary mods: Remove mods your players don't use
Regular restarts: Schedule automatic restarts every 12-24 hours

Your ATM9 server is now ready! Players can join and explore the massive collection of mods. Monitor performance and adjust settings as needed for optimal gameplay.

All the Mods 9 Server Setup Guide