Sync Client Server (SCS)

Sync Client Server (SCS)

Sync Client Server (SCS) is a mod designed to keep client mods and configurations synchronized with a server-provided modpack, reducing version mismatches and manual mod management.

With a single in-game Update button directly in the multiplayer server list, players can download the mods and configs required by the server in a simple and reliable way.

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📸 Preview

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🎯 Goal

SCS aims to simplify server administration and improve player experience by making modpack updates clear, predictable, and user-friendly, without requiring external launchers or manual file management.

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✨ What SCS Can Do

• In-game Update button in the multiplayer server list
• Confirmation screen with update summary and Clear cache option
• modId-based synchronization to prevent duplicated or outdated mods
• Optional synchronization of /config alongside /mods
• Optional mirror mode for /mods and /config
• Server-enforced removal of specific client mods
• Per-server isolated cache
• Built-in lightweight file server to host mods.zip and config.zip

⚠️ Important:

– Mod updates require a game restart to take effect

– Config updates do NOT require a restart and are applied immediately

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🎮 Client Usage (Simple & Automatic)

The client workflow is intentionally minimal.

1️⃣ Add the server

• Add the server normally in the Multiplayer screen
• The Download URL field is automatically filled using the server address and port
• You may override it manually if needed

Example:

http://myserver.com:25566

2️⃣ Update the client

1. Select the server in the list
2. Click Update
3. Review the summary and confirm

That’s it.
Restart the game only if mods were updated.

🧹 Clear Cache

Use Clear cache from the confirmation screen if:

• A download fails
• The client becomes out of sync
• ZIP contents changed but no update is triggered
• Other unexpected behaviors

Cache is isolated per server and safe to clear.

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🖥️ Server Usage (Admin Guide)

1️⃣ Install and start

• Install SCS on the server
• Start the server once to generate the config file

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2️⃣ Common Configuration

Config file:

config/scs-common.toml

Default values:

fileServerPort = 25566
updateConfig = true
mirrorMods = false
mirrorConfig = false

Explanation:

• fileServerPort Port used by the built-in file server (default: 25566)
• updateConfig Enables client config updates (enabled by default)
• mirrorMods / mirrorConfig Disabled by default. When enabled, client folders are forced to exactly match the ZIP files

Because updateConfig is enabled by default, server admins can push new configuration changes to clients, such as enabling or disabling mirror options.

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3️⃣ Creating the update packages

Option A: Using in-game commands

On the server, run:

/scs save-mods
/scs save-config

This generates:

• mods.zip
• config.zip

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Option B: Manual ZIP creation (advanced / recommended for control)

Admins may manually create or edit:

• mods.zip
• config.zip

This allows:

• Shipping only specific mods or configs
• Full control over update contents

Both methods are fully supported.

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4️⃣ Removing client mods (server-enforced)

To force the removal of specific client mods:

1. Create a file named:

modsToRemoveFromTheClient.json

1. Place it inside mods.zip
2. List the .jar filenames to remove

Example:

[
  "examplemod1.jar",
  "examplemod2.jar"
]

These mods will be deleted from the client during the update.

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5️⃣ Built-in File Server

When the server is running, SCS automatically hosts:

• mods.zip
• config.zip

On:

<server-ip>:fileServerPort

Default:

<server-ip>:25566

No external web server is required.

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📦 Modpack Usage

Feel free to include this mod in your modpack — credits are appreciated but not required.

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❤️ Credits & Fork Notice

This project is a fork of the mod _MMMMM_ by Place-Boy.
Original project: https://www.curseforge.com/minecraft/mc-mods/mmmmm

All credit for the original concept and foundation goes to the original author.