Systemd: Create a New Service and Run on Boot
For this occasion, I wanted my telegram bot to start automatically right after my Raspberry Pi Zero booted and connected to the network.
Creating the service file
I named my service file telegram-bot.service:
sudo touch /etc/systemd/system/telegram-bot.service
And started editing it with sudo vim /etc/systemd/system/telegram-bot.service.
I wanted this service to execute python3.6 bot.py on boot, after connecting to the network, under my user (i.e. not as root).
The final form of the file:
[Unit]
Description=Start telegram bot on boot
Wants=network-online.target
After=newtork.target network-online.target
[Service]
User=hlias
Group=hlias
ExecStart=/usr/local/bin/python3.6 bot.py
WorkingDirectory=/home/hlias/my-fetch-bot
[Install]
WantedBy=multi-user.target
Enabling the service
sudo systemctl enable telegram-bot.service
Now, after every reboot, the service will be executed as we wanted.