NanoLimbo

This is a lightweight Minecraft limbo server, written in Java with Netty. The main goal of this project is maximum simplicity with a minimum number of sent and processed packets. The limbo is empty; there is no ability to set a schematic building since this is not necessary. You can send useful information via chat or boss bar.

No plugins, no logs. The server is fully clear. It is only able keep a lot of players while the main server is down.

General features:

• High performance. The server doesn't save or cache any useless (for limbo) data.
• Doesn't spawn threads per player. Uses a fixed thread pool.
• Support for BungeeCord and Velocity info forwarding.
• Support for BungeeGuard handshake format.
• Multiple versions support.
• Fully configurable.
• Lightweight. App size around 2MB.

Versions support

Symbol X means all minor versions.

• 1.7.X
• 1.8.X
• 1.9.X
• 1.10.X
• 1.11.X
• 1.12.X
• 1.13.X
• 1.14.X
• 1.15.X
• 1.16.X
• 1.17.X
• 1.18.X
• 1.19.X
• 1.20-1.20.2

The server doesn't support snapshots.

Commands

• help - Show help message
• conn - Display number of connections
• mem - Display memory usage stats
• stop - Stop the server

Note that the server also will be closed correctly if you just press Ctrl+C.

Installation

The installation process is simple.

1. Download the latest version of the program here.
2. Put the jar file in the folder you want.
3. Create a start script as you did for Bukkit or BungeeCord, with a command like this: java -jar NanoLimbo-<version>.jar
4. The server will create settings.yml file, which is the server configuration.
5. Configure it as you want and restart the server.

Player info forwarding

The server supports player info forwarding from the proxy. There are several types of info forwarding:

• LEGACY - The BungeeCord IP forwarding.
• MODERN - Velocity native info forwarding type.
• BUNGEE_GUARD - BungeeGuard forwarding type.

If you use BungeeCord, or Velocity with LEGACY forwarding, just set this type in the config.
If you use Velocity with MODERN info forwarding, set this type and paste the secret key from Velocity config into secret field. If you installed BungeeGuard on your proxy, then use BUNGEE_GUARD forwarding type. Then add your tokens to tokens list.

Contributing

Feel free to create a pull request if you found some bug or optimization opportunity, or if you want to add some functionality that is suitable for a limbo server and won't significantly load the server.

All PRs should target the dev branch to keep the main branch stable and clean.

Building

Required software:

• JDK 1.8+
• Gradle 7+ (optional)

To build a minimized jar, go to the project root directory and run in the terminal:

./gradlew shadowJar

Contacts

If you have any questions or suggestions, join our Discord server!