SLS is a declarative orchestration system for ephemeral game servers, designed especially for Minecraft networks. Everything in SLS is reproducible, isolated, and fully defined through Blueprints.
SLS runs every game server inside its own Docker container, keeping environments clean, consistent and secure.
SLS is free and open-source software licensed under the AGPL-3.0.
The master controller for all SLS operations. Responsible for building, orchestrating, and managing servers based on Blueprints.
The server control plane for SLS. Each daemon runs containers, handles world mounting, applies overlays, and executes lifecycle actions.
A Java wrapper for the Protocube API, providing a clean interface for plugins and external tools.
A Velocity proxy plugin that lets you manage SLS servers directly through in-game commands.
A resource-pack management system with automatic routing and versioning logic.
Blueprints are declarative specifications describing exactly how a game server should run: its software, world, version, limits, configuration patches, and bundled content.
Below is a full example Blueprint.
# Blueprint metadata
blueprint:
id: 'block_hunt' # Unique slug ID
name: 'Block Hunt' # Human-readable name
type: 'minigame' # Arbitrary grouping tag
# World configuration
world:
name: "Block Hunt"
authors: "Protoxon"
path: "minigames/block_hunt"
# Server configuration
server:
software: "Paper"
version: "1.18.2"
image: "sls:java_21"
path: "paper/1.18.2"
# Optional resource limits
limits:
memory_limit: 4096
swap: 1024
io_weight: 500
cpu_limit: 200
disk_space: 10000
threads: ""
oom_disabled: false
# Optional configuration patches
configs:
server.properties:
parser: properties
find:
motd: "Block Hunt Server"
# Optional content bundled with the server.
content:
- name: "WorldEdit"
source: "plugins/bukkit/worldedit"
- name: "Terralith"
source: "datapacks/terralith"
- name: "Distant Horizons"
source: "mods/fabric/distant_horizons"
# Whether to persist servers created from this blueprint.
# If false, the server is removed on shutdown.
save: false
# Arbitrary metadata for external systems
annotations:
resource_pack: "block_hunt"
allowed_clients: "1.12..1.15, !1.13, 1.20"
maintainer: "Protoxon"
tags: ["hide n seek", "pvp"]Warning
This version of SLS is actively in development and is not yet ready for use.