Dedicated server guide

Onset

Manage onsetserver with AlphaGSM. Choose a runtime supported by the recorded module capabilities.

Not recorded in the support snapshot · Support evidence: 2026-10-16.

Build setup commands

Runtime familyunknown

Runtime support is unknown in this snapshot; review the game guide.

Network bindings

Port numbers and protocols are unknown in this snapshot; review the game guide and configuration.

Mods and plugins

Mod support is unknown in this snapshot; review the game guide before adding mods.

Backup hook

Backup hook support is unknown in this snapshot; review the game guide for backup and restore procedures.

Choose a supported runtime

Linux and Docker quickstart

This guide has no recorded support entry. Review the upstream guide and current support notes before attempting setup.

Use the upstream guide and support notes to review this module’s requirements before attempting installation or launch.

This guide covers the onsetserver module in AlphaGSM.

Requirements

The native Linux server requires the legacy OpenSSL 1.1 runtime (libssl.so.1.1), which Ubuntu 24.04 does not include by default. AlphaGSM's steamcmd-linux Docker image includes this dependency.

screen
SteamCMD runtime dependencies
openssl on Linux hosts, matching the upstream Onset dedicated-server guide
Python packages from requirements.txt

Quick Start

Create the server:

alphagsm myonset create onsetserver

Run setup:

alphagsm myonset setup

Start it:

alphagsm myonset start

Check it:

alphagsm myonset status
alphagsm myonset query
alphagsm myonset info

Stop it:

alphagsm myonset stop

Setup Details

Setup configures:

the main game port (default 7777)
the install directory
SteamCMD downloads the server files
a generated server_config.json
the documented derived ports:
- query UDP: port - 1
- file / HTTP TCP: port - 2

Useful Commands

alphagsm myonset update
alphagsm myonset backup

Notes

Module name: onsetserver
Game: Onset
Engine: Unreal 4
SteamCMD App ID: 1204170
Default executable: <install_dir>/start_linux.sh
Config file: <install_dir>/server_config.json
AlphaGSM starts the server with --config <install_dir>/server_config.json
AlphaGSM adds the install root to LD_LIBRARY_PATH so the launcher can load the bundled libsteam_api.so
Smoke readiness requires the server's Server loaded. Entering simulation marker and a TCP connection to the documented file service at port - 2
The generated config defaults to the documented sandbox package and a private masterlist=false profile

Server variables

After create onsetserver, inspect or change these with set:

alphagsm myserver set --list
alphagsm myserver set KEY --describe
alphagsm myserver set KEY VALUE

Key	Aliases	Type	What it does
`dir`	—	string	Install directory for the server.
`exe_name`	—	string	Server executable filename.
`gamemode`	—	string	The short description shown for the server.
`ipaddress`	—	string	The bind address written to server_config.json.
`iplimit`	—	integer	Maximum simultaneous connections per IP.
`maxplayers`	users	integer	Maximum players allowed on the server.
`password`	—	string	Optional join password. Stored as a secret.
`port`	gameport	integer	Primary gameplay port.
`servername`	hostname, name	string	The advertised Onset server name.
`servername_short`	—	string	The short server name used for rich presence.
`timeout`	—	integer	Client timeout in milliseconds.
`website_url`	—	string	The homepage URL advertised by the server.

Developer Notes

Run File

Executable: start_linux.sh
Location: <install_dir>/start_linux.sh
SteamCMD App ID: 1204170

Server Configuration

Config path: <install_dir>/server_config.json
Key settings:
- servername
- servername_short
- gamemode
- ipaddress
- port
- maxplayers
- password
- timeout
- iplimit

Ports

Game: port/udp
Query: port - 1/udp
HTTP / file downloads: port - 2/tcp

Share your server

Sector Alpha server directory

When your server is ready, you can publish its connection details and community information on Sector Alpha. Review your listing and keep the information current.

Find a community

Browse the directory for game servers and their published connection details.

Browse server directory

Publish your server

Prepare a name, address and description for your listing.

Publish a server

Manual server sharing instructions

Frequently asked questions

What support evidence is recorded for Onset?

Not recorded in the support snapshot. This guide has no recorded support entry. Review the upstream guide and current support notes before attempting setup.

Which runtimes can run Onset?

Runtime support is unknown in this snapshot; review the game guide.

Which ports does Onset use?

Port numbers and protocols are unknown in this snapshot; review the game guide and configuration.

Can I add mods to Onset?

Mod support is unknown in this snapshot; review the game guide before adding mods.

How should I back up Onset?

Backup hook support is unknown in this snapshot; review the game guide for backup and restore procedures.

Source and support evidence

This guide mirrors AlphaGSM’s upstream documentation at 32cef5ba9e03053c8e461fffa0ba133b160b528d. Commands and prerequisites can change. Check current support notes before installation.

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