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    RAUC

    The update system of Home Assistant OS. It installs a new version of the whole system next to the running one, so a device can go back when an update does not work.

    In code
    .raucbbuildroot-external/ota/
    Also
    update bundle

    Home Assistant OS has two system slots. RAUC writes an update bundle to the slot that is not running, and the device boots into it. If that does not work, it goes back to the slot it came from. The Supervisor starts these updates. See The update system.

    Related terms

    • Home Assistant OSThe operating system made to run Home Assistant, with the Supervisor, apps, and backups. The recommended way to install Home Assistant.
    • BuildrootThe tool Home Assistant OS is built with. It builds a complete, small Linux system from source, instead of starting from a distribution like Ubuntu.
    • SupervisorThe part of Home Assistant OS that runs Home Assistant Core and apps, each in its own container, and handles their updates and backups.