dht22/systemd/notes.md

Creating systemd unit for Auto Start/Restart

The steps below outline the process for creating a systemd service unit.

This service will automatically start the python script.

Procedure

1. Create the service template by copying dht-start-restart@.service into /etc/systemd/system/.
2. Define environment variables for an instance of this template by copying dht-start-restart@pimonitoring1 into /etc/default/.
   • NOTE: The instance should replace the name of the RPiZW. (e.g. pimonitoring2, etc.)
3. Create the instance and enable it with sudo systemctl enable --now dht-start-restart@pimonitoring1
   • NOTE: It may be required to reload the systemd daemon. sudo systemctl reload-daemon

Common Issues

• Is the User= in dht-start-restart@.service correct? pi vs. shaun
• Is the {PATH_TO_FILE} in dht-start-restart@pimonitoring1 correct? /home/pi vs. /home/shaun
• Does the python script main.py contain any relative paths?