Hi Nezar,

The service can be called directly with "service your-service action"
You can stop the service like this:

sudo service odoo-server stop

And start it like this:

sudo service odoo-server start

Notice that the service name can be different, depending on how you've installed the Odoo instance. You can also run the Odoo instance from the terminal (after stopping it) like this:

./odoo-bin -u your_module_to_update -c /etc/odoo-server.conf

If you don't know the name of your service you can find it out by printing out the list of services and grepping (searching) on Odoo:

ls /etc/init.d | grep odoo

You will get an output with all available services which contain the name "odoo". An example on my own VM:

Regards,
Yenthe