Debugging the Home Assistant Operating System


This section is not for end users. End users should use the SSH add-on to SSH into Home Assistant. This is for developers of Home Assistant. Do not ask for support if you are using these options.

You need set the dev mode on supervisor and enable debug with options. You need also install the Remote debug Add-on from Developer Repository to expose the debug port to Host.

SSH access to the host


SSH access through the SSH add-on (which will give you SSH access through port 22) will not provide you with all the necessary privileges, and you will be asked for a username and password when typing the 'login' command. You need to follow the steps below, which will setup a separate SSH access through port 22222 with all necessary privileges.

Home Assistant Operating System

Use a USB drive formatted with FAT, ext4, or NTFS and name it CONFIG (case sensitive). Create an authorized_keys file (no extension) containing your public key, and place it in the root of the USB drive. File needs to be ANSI encoded (not UTF-8) and must have Unix line ends (LF), not Windows (CR LF). See Generating SSH Keys section below if you need help generating keys. From the UI, navigate to the Supervisor system page and choose "Import from USB". You can now access your device as root over SSH on port 22222. Alternatively, the file will be imported from the USB when the Home Assistant OS device is rebooted.


Make sure when you are copying the public key to the root of the USB drive that you rename the file correctly to authorized_keys with no .pub file extension.

You should then be able to SSH into your Home Assistant device. On Mac/Linux, use:

ssh [email protected] -p 22222

You will initially be logged in to Home Assistant CLI for HassOS where you can perform normal CLI functions. If you need access to the host system use the 'login' command. Home Assistant OS is a hypervisor for Docker. See the Supervisor Architecture documentation for information regarding the supervisor. The supervisor offers an API to manage the host and running the Docker containers. Home Assistant itself and all installed addon's run in separate Docker containers.

Checking the logs

# Logs from the supervisor service on the Host OS
journalctl -f -u hassos-supervisor.service
# Supervisor logs
docker logs hassos_supervisor
# Home Assistant logs
docker logs homeassistant

Accessing the container bash

docker exec -it homeassistant /bin/bash

Generating SSH Keys

Windows instructions for how to generate and use private/public keys with Putty are here. Instead of the droplet instructions, add the public key as per above instructions.

Alternative instructions, for Mac, Windows and Linux can be found here.

Follow steps 1-4 under 'Generating a new SSH key' (The other sections are not applicable to Home Assistant and can be ignored.)

Step 3 in the link above, shows the path to the private key file id_rsa for your chosen operating system. Your public key,, is saved in the same folder. Next, select all text from text box "Public key for pasting into the authorized_keys file" and save it to the root of your USB drive as authorized_keys.

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