Home Assistant Operating System

Home Assistant Operating System (formerly HassOS) is a Linux based operating system optimized to host Home Assistant and its Add-ons.

Home Assistant Operating System uses Docker as its container engine. By default it deploys the Home Assistant Supervisor as a container. Home Assistant Supervisor in turn uses the Docker container engine to control Home Assistant Core and Add-Ons in separate containers. Home Assistant Operating System is not based on a regular Linux distribution like Ubuntu. It is built using Buildroot and it is optimized to run Home Assistant. It targets single board compute (SBC) devices like the Raspberry Pi or ODROID but also supports x86-64 systems with UEFI.

Features

Lightweight and memory-efficient
Minimized I/O
Over The Air (OTA) updates
Offline updates
Modular using Docker container engine

Supported hardware

Nabu Casa
Raspberry Pi
Hardkernel ODROID
Asus Tinker Board
Generic x86-64 (e.g. Intel NUC)
Virtual appliances

See the full list and specific models here

Getting Started

If you just want to use Home Assistant the official getting started guide and installation instructions take you through how to download Home Assistant Operating System and get it running on your machine.

If you're interested in finding out more about Home Assistant Operating System and how it works read on...

Development

If you don't have experience with embedded systems, Buildroot or the build process for Linux distributions it is recommended to read up on these topics first (e.g. Bootlin has excellent resources).

The Home Assistant Operating System documentation can be found on the Home Assistant Developer Docs website.

Components

Bootloader:
- GRUB for devices that support UEFI
- U-Boot for devices that don't support UEFI
Operating System:
- Buildroot LTS Linux
File Systems:
- SquashFS for read-only file systems (using LZ4 compression)
- ZRAM for /tmp, /var and swap (using LZ4 compression)
Container Platform:
- Docker Engine for running Home Assistant components in containers
Updates:
- RAUC for Over The Air (OTA) and USB updates
Security:
- AppArmor Linux kernel security module

Development builds

The Development build GitHub Action Workflow is a manually triggered workflow which creates Home Assistant OS development builds. The development builds are available at https://os-artifacts.home-assistant.io/index.html.

License

rpardini/hassos

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