AutoServer
by Artificial
AutoServer, a Fabric server mod for Velocity proxies, starts an offline backend server when a player tries to connect to it and stops idle ones.
What it does
When a player attempts to connect to an offline backend server, the plugin starts that server automatically. Servers that have no players online are stopped again, so networks that hold many servers can keep idle ones offline and save resources until they are needed. Commands also let an operator start and stop backend servers by hand.
The plugin is aimed at server networks that use Velocity as the proxy. Once the mod has started for the first time, a config.toml file appears in the plugins/autoserver folder, and the file can be changed to match the network. Messages shown to players can be customized, and configuration changes are picked up without a restart.
The setup section covers how to install and configure a minimal AutoServer setup. Launching can run in the background by default, but the wider process handling depends on the operating system, with examples for Linux (x-terminal-emulator, Bash, screen, tmux, systemd, Docker) and Windows (Command Prompt and PowerShell windows). Process launching may need privilege adjustments.
Key features
Automatic start on connect
A player who tries to join an offline backend server causes the plugin to start it.
Automatic stop when idle
Local servers with no players online are stopped, keeping idle servers offline until needed.
Manual control by command
Operators can start and stop backend servers using commands.
Configuration hot reloading
Changes to the configuration are loaded without restarting the plugin or the proxy.
Customizable messages
The text players see during start and stop events can be changed in the configuration file.
Compatibility
Latest build for each game version and loader.
1.21.x5 of 5 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Operators of Velocity proxy networks that host several backend servers, who want those servers started and stopped on demand.
How it compares
ClockStopper is also a Fabric server mod under the MIT License, but it targets 1.21.1 – 1.21.11, while AutoServer covers 1.7.2 – 1.21.10 with files for many more game versions. AutoShutdown is a server mod for Fabric and Quilt under the GNU General Public License v3.0 or later, with a broader range of 1.8 – 26.2. Both are server-side only, like AutoServer.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| AutoServer | Fabric | 1.7.2 – 1.21.10 | Server-side only | 2025-10-30 |
| ClockStopper | Fabric | 1.21.1 – 1.21.11 | Server-side only | 2026-02-09 |
| AutoShutdown | Fabric and Quilt | 1.8 – 26.2 | Server-side only | 2024-09-22 |
Questions
Does AutoServer need to be installed on the players' side?
Where is the configuration file located?
Which Velocity proxy version works with AutoServer?
Can the configuration be changed without a restart?
In the catalog
AutoServer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 15,569 mods support Minecraft 1.21.10.
Similar mods
What the author says
AutoServer is a Minecraft plugin designed for the Velocity Proxy. This plugin automatically starts offline backend servers when a player attempts to connect to them. It's perfect for server networks looking to save resources by keeping idle servers offline until needed. This section will cover how to install and…
Official listing
- Modrinth page
- modrinth.com/mod/autoserver
- Owner
- Artificial
- Published
- 2024-12-22
- Updated on Modrinth
- 2025-10-30
- Facts verified
- 2026-10-15