MultiFabricServer
by Uxzylon
MultiFabricServer runs several server instances, each one a lazy-loaded cluster, inside a single Fabric JVM.
What it does
Each cluster starts only when a player needs it and stops after a configured idle delay once it has been empty. Players use cluster travel commands to move between the host's cluster nodes. The player list, chat, join and leave notices, advancement notices and command output span every running cluster, so the network reads as one server.
The mod can run in standalone mode without Velocity. A built-in gateway takes the public port, forwards each player to the chosen cluster, and hands the connection over with Minecraft transfer packets. The host server then needs a separate port, for instance 25566, since the gateway holds the public one. Velocity remains optional for behavior the gateway does not provide, such as keeping chat history during a switch.
MultiFabricServer requires Fabric API. It is server-side only, so players join without installing anything, and it is released under the MIT License as open source. Files are published for 26.1 only, with 1.0.0-beta.1 as the latest file on the beta channel. The mod is experimental.
Key features
Lazy-loaded clusters
Clusters are started only when a player needs them and stopped after the configured idle delay.
Cluster travel command
A cluster tp command moves players between the host's cluster nodes.
Shared player list and notices
The player list, chat, join and leave notices and command output are shared across running clusters.
Velocity switching
With the companion Velocity plugin, seamlessProxySwitchEnabled registers new clusters dynamically, so they work without editing velocity.toml by hand.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server owners who want several lazy-loaded worlds behind one address and accept that the mod is experimental.
How it compares
FabricProxy-Sign is a Fabric mod for 26.2 – 26.3, server-side only, under the MIT License and open source. DiscordIO is a server-side Fabric mod for 1.21 – 26.3, also MIT and open source, and it links chat with Discord rather than managing clusters. MultiFabricServer covers 26.1 alone and is the only option here that runs several server instances in one JVM.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| MultiFabricServer | Fabric | 26.1 | Server-side only | 2026-06-30 |
| FabricProxy-Sign | Fabric | 26.2 – 26.3 | Server-side only | 2026-10-01 |
| DiscordIO | Fabric | 1.21 – 26.3 | Server-side only | 2026-06-06 |
Questions
Does MultiFabricServer require Fabric API?
Do players need to install anything?
Is Velocity needed to use the mod?
In the catalog
MultiFabricServer is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 11,959 mods support Minecraft 26.1.
Similar mods
What the author says
Experimental Fabric server-side mod for running multiple lazy-loaded Minecraft server instances, called clusters, inside one JVM. Players use /cluster travel or /cluster tp to move between the host and cluster nodes. Nodes start on demand and stop after they have been empty for the configured idle delay. Player list…
Official listing
- Modrinth page
- modrinth.com/mod/multifabricserver
- Owner
- Uxzylon
- Published
- 2026-06-30
- Updated on Modrinth
- 2026-06-30
- Facts verified
- 2026-10-15