At times you create a script and then you want to have the scripts controlled by systemd or in some cases you wish to have the scripts getting restarted by itself when it is killed due to some reason.

In such cases systemd in Linux helps to configure services which can be managed.

To do so follow the following steps.

1. cd /etc/systemd/system
2. Create a file named your-service.service and include the follow

[Unit]
Description=<description about this service>

[Service]
User=<user e.g. root>
WorkingDirectory=<directory_of_script e.g. /root>
ExecStart=<script which needs to be executed>
Restart=always

[Install]
WantedBy=multi-user.target

For Python specific projects which include virtual environment:

[Unit]
Description=<project description>

[Service]
User=<user e.g. root>
WorkingDirectory=<path to your project directory containing your python script>
ExecStart=/home/user/.virtualenv/bin/python main.py
Restart=always
# replace /home/user/.virtualenv/bin/python with your virtualenv and main.py with your script

[Install]
WantedBy=multi-user.target

or

[Unit]
Description=<project description>

[Service]
User=<user e.g. root>
WorkingDirectory=<path to your project directory>
ExecStart=/bin/bash -c 'cd /home/ubuntu/project/ && source venv/bin/activate && python test.py'

[Install]
WantedBy=multi-user.target

Reload the service file to include the new one

sudo systemctl daemon-reload

To check the status of the service

sudo systemctl status example.service

To enable the service on every reboot

sudo systemctl enable example.service

To disable the service on every reboot

sudo systemctl disable example.service