TL;DRTo put your Home Assistant instance online with ngrok:
  1. Start Home Assistant locally in a Docker container
  2. Add ngrok to the Docker container
  3. Allow trusted proxies in Home Assistant
This guide covers how to set up Home Assistant with ngrok. This combination lets you access your Home Assistant dashboard over the public internet. Prerequisites:
  • Docker Desktop
  • Docker Compose
  • ngrok installed on your machine
  • Basic familiarity with the command line
Tip: This guide walks through setting up Home Assistant in a Docker container from scratch, but the same principles apply if you already have a Home Assistant instance set up, or if you set it up using one of their other installation methods.

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Step 1: Initial setup

  1. Create a directory called home-assistant
  2. Inside the home-assistant directory:
  • create your Docker Compose file called compose.yaml
  • create a directory called config

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Step 2: Run Home Assistant in a Docker container

  1. Update compose.yaml:
services:
  homeassistant:
    image: "ghcr.io/home-assistant/home-assistant:stable"
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /run/dbus:/run/dbus:ro
      # the first part of this path will be the location of
      # the `/home-assistant/config` directories you created in the last step
      - /Desktop/home-assistant/config:/config
    restart: unless-stopped
    ports:
      - 8123:8123
    privileged: true
  1. In your terminal, start a Docker container with this compose.yaml file:
docker compose up -d
  1. Visit localhost:8123 in your browser. You should see your Home Assistant login page: Home Assistant on localhost

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Step 3: Add ngrok

  1. Add ngrok to your compose.yaml under the services section:
services:
  ngrok:
    image: ngrok/ngrok:latest
    command:
      - "http"
      - "http://host.docker.internal:8123"
    ports:
      # you can choose different ports here if you want
      - 4041:4041
    environment:
      # find this at https://dashboard.ngrok.com/get-started/your-authtoken
      NGROK_AUTHTOKEN: YOUR_AUTH_TOKEN
  1. In your terminal, restart your Docker container with this compose.yaml file:
docker compose up -d
  1. Visit your ngrok dashboard to see the endpoint URL: ngrok Endpoints
  2. If you visit the ngrok URL, you’ll get a 4xx response: ngrok Endpoints
and an error log line your Docker Desktop logs for the Home Assistant container: 
ERROR (MainThread) [homeassistant.components.http.forwarded] A request from a reverse proxy was received from 192.168.65.1, but your HTTP integration is not set-up for reverse proxies
That’s because we still have to update the Home Assistant configuration to allow trusted proxies.

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Step 3: Allow trusted proxies in Home Assistant

  1. In your /home-assistant/config directory, look for the file called configuration.yaml. By default, it should already have these settings:
# Loads default set of integrations. Do not remove.
default_config:

# Load frontend themes from the themes folder
frontend:
  themes: !include_dir_merge_named themes

automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml
Add this new section to the bottom: 
http:
  use_x_forwarded_for: true
  trusted_proxies:
    # this IP may be different on your network; grab the IP from the error message
    # in your logs
    - 192.168.65.1
    - 127.0.0.1
    - ::1
  1. Restart the Docker container so the updated Home Assistant configuration can take effect.
  2. Visit your ngrok endpoint URL and see your Home Assistant instance online! ngrok hosting Home Assistant