Installation

Install Saturn with the Standalone Aegis loader, move an existing Paper 1.21.11 server over, and find the files Saturn creates.

Before you start

Back up your worlds, plugins and current server jar.
Use Java 21 or newer.
Allow outbound internet access. On first start Saturn downloads the vanilla Minecraft 1.21.11 server from Mojang and its libraries, then keeps them in the loader's .aegis folder for later starts.

Saturn is delivered through your personal Aegis loader. Getting started explains the loader, and Installation covers downloading it.

Install

Download the Standalone loader

Download the Standalone loader from the Downloads page of your dashboard. The file is always named Aegis.jar. Put it in the server's folder, where your worlds and server.properties are or will be.

Run the loader once

Start it from the server's folder. The first run creates aegis.yml next to the jar.

java -Xms4G -Xmx4G -jar Aegis.jar --nogui

Put JVM options such as -Xmx before -jar. Anything after Aegis.jar is passed to the server, the same as arguments to a Paper jar.

Choose Saturn

Set the product in aegis.yml:

aegis.yml

product: Saturn
version: latest
channel: stable
debug: false

Start again

Run the same command. The loader starts Saturn, which starts like Paper. On a new server, accept the EULA in eula.txt as you would on Paper, then start once more.

Moving from Paper

Saturn reads the same server files as Paper 1.21.11. To move an existing server:

Stop the server and take a backup.
Put Aegis.jar in the server's folder and follow the steps above.
Start the loader instead of your Paper jar. Keep your worlds, plugins/ and Paper config files where they are.

Files Saturn creates

Path	Created	Purpose
`saturn.yml`	Early in startup, if missing	All of Saturn's settings. See Configuration.
`saturn-world-defaults.yml`	Early in startup, if missing	A template for per-world blocks. Saturn never reads it.
`saturn/knockback/`	When you save a knockback profile	Saved knockback profiles. See Knockback profiles.

All three live in the server's folder.