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HASS Cheatsheet.md

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If RPi is not syncing the time

Use the systemd-timesyncd service as explained here Here are the time servers that I used.

NTP=0.north-america.pool.ntp.org 1.north-america.pool.ntp.org 2.north-america.pool.ntp.org 3.north-america.pool.ntp.org
FallbackNTP=0.arch.pool.ntp.org 1.arch.pool.ntp.org 2.arch.pool.ntp.org 3.arch.pool.ntp.org

HASS operations

  1. To stop HA sudo systemctl stop home-assistant@homeassistant
  2. To start HA sudo systemctl start home-assistant@homeassistant
  3. To restart HA sudo systemctl restart home-assistant@homeassistant
  4. To check realtime logs sudo journalctl -f -u home-assistant@homeassistant
  5. To check logs sudo systemctl status -l home-assistant@homeassistant

Backing up Configurations on Github

Thanks to @dale3h for assistance with these instructions.

  1. Install git using sudo apt-get install git

  2. Go to https://github.com/new and create a new repository. I named mine HASS. Initialize with readme: no and .gitignore: none.

  3. Navigate to your .homeassistant directory. For AIO, it should be /home/hass/.homeassistant, and for HASSbian, it is /home/homeassistant/.homeassistant.

  4. Run sudo su -s /bin/bash hass for AIO and sudo su -s /bin/bash homeassistant for HASSbian.

  5. Run wget https://raw.githubusercontent.com/arsaboo/homeassistant-config/master/.gitignore to get the .gitignore file from your repo (replace the link to match your repository). You can add things to your .gitignore file that you do not want to be uploaded.

  6. Next, we need to add SSH keys to your Github account.

    • Navigate to cd /home/hass/.ssh (for AIO). If you don't have .ssh directory, create one and change the permission chmod 700 ~/.ssh.
    • Run ssh-keygen -t rsa -b 4096 -C "homeassistant@pi". If you want to enter a passphrase, that's up to you. If you do, you'll have to enter that passphrase any time you want to update your changes to github. If you do not want a passphrase, leave it blank and just hit Enter.
    • Save the key in the default location (press Enter when it prompts for location).
    • When you're finished, run ls -al ~/.ssh to confirm that you have both id_rsa and id_rsa.pub files.
    • Go to https://github.com/settings/keys and click New SSH key button at top right. Title: homeassistant@pi (or whatever you want, really...it's just for you to know which key it is)
    • Run cat id_rsa.pub in the SSH session and copy/paste the output to that github page.
    • Then click Add SSH key button.

  7. Go back to your repo page on GitHub. It'll be something like https://github.com/yourusernamehere/homeassistant-config. Click the green Clone or download button, and then click Use SSH.

  8. You should see something like this in the textbox: [email protected]:yourusername/homeassistant-config.git. Copy that to your clipboard.

  9. Now you are ready to upload the files to GitHub.

    • Navigate to cd ~/.homeassistant
    • git init
    • git add .
    • git commit -m 'initial commit'
    • If you get an error about *** Please tell me who you are., run git config --global user.email "[email protected]" and git config --global user.name "Your Name"
    • After that commit succeeds, run: git remote add origin [email protected]:yourusername/homeassistant-config.git (make sure you enter the correct repo URL here)
    • Just to confirm everything is right, run git remote -v and you should see: 
      hass@raspberrypi:~/.homeassistant$ git remote -v
origin  [email protected]:arsaboo/homeassistant-config.git (fetch)
origin  [email protected]:arsaboo/homeassistant-config.git (push)
    • Finally, run git push origin master.

  10. For subsequent updates:

    • cd /home/homeassistant/.homeassistant
    • sudo su -s /bin/bash homeassistant
    • git add .
    • git commit -m 'your commit message'
    • git push origin master

  11. To restore from your Github repository (replace the URL):

    sudo su -s /bin/bash homeassistant
cd /home/homeassistant
git clone [email protected]:arsaboo/homeassistant-config.git .homeassistant

To upgrade HASS manually:

  • Login to system. HASS configuration files are saved in /home/homeassistant/.homeassistant and the code files are saved in /srv/homeassistant/lib/python3.5/site-packages/homeassistant/.
  • Change to homeassistant user sudo su -s /bin/bash homeassistant
  • Change to virtual enviroment source /srv/homeassistant/bin/activate
  • Update HA pip3 install --upgrade homeassistant. To update to a different branch, use the complete git URL, pip3 install --upgrade git+git://github.com/home-assistant/home-assistant.git@dev
  • Type exit to logout the hass user and return to the pi user.
  • Restart the Home-Assistant Service sudo systemctl restart home-assistant@homeassistant

Miscellaneous Tips/Tricks

  • You can test the Read Speed of your SD card using (note, this command takes some time to run): 
    sudo dd if=/dev/mmcblk0 of=/dev/null bs=8M count=100
sudo hdparm -t /dev/mmcblk0
  • Many of the problems with Pi are related to faulty power supply. You can use vcgencmd get_throttled to check if your Pi is getting adequate power supply. You want that to return throttled=0x0. If not it means that the Raspberry is throttling itself due to low voltage, or other factors.
  • Test Write speed (will create 200MB file in /home/pi/testfile) using dd if=/dev/zero of=/home/pi/testfile bs=8M count=25
  • To check which files are using up all the space on your SD card, run sudo du | sort -n. You can delete the culprits using something like sudo rm -rf ./.pm2/logs/ (will recursively delete folder /logs/).