Creating a Systemd Unit File will help you achieve the Same

Open any of your text editor and create a service unit file called odoo14.service 

use the following command in Command line (terminal):

sudo nano /etc/systemd/system/odoo14.service

then add following code to it:

[Unit]
Description=Odoo14
Requires=postgresql.service
After=network.target postgresql.service
[Service]
Type=simple
SyslogIdentifier=odoo14
PermissionsStartOnly=true
User=odoo14
Group=odoo14
ExecStart=/opt/odoo14/odoo-venv/bin/python3 /opt/odoo14/odoo/odoo-bin -c /etc/odoo14.conf
StandardOutput=journal+console
Restart=always
[Install]
WantedBy=multi-user.target

Notify systemd that a new unit file exists:

sudo systemctl daemon-reload

Start the Odoo service and enable it to start on boot by running:

sudo systemctl enable --now odoo14

"Restart=always"  helps you to make the Odoo always alive whenever the service is going down.

Thanks

Happy to help,