On Debian or Ubuntu Linux systems, the systemd service manager is responsible for managing system services, including starting, stopping, and restarting services.
To start a service on a Debian or Ubuntu system, you can use the systemctl command with the start option and the name of the service. For example, to start the nginx service, you can use the following command:
sudo systemctl start nginx
This will start the nginx service.
You can also use the systemctl command to enable a service to start automatically at boot time. To do this, you can use the enable option and the name of the service. For example:
sudo systemctl enable nginx
This will enable the nginx service to start automatically at boot time.
You can use the systemctl command to manage other aspects of service management, such as stopping and restarting services, checking the status of services, and viewing log output. For example, you can use the stop option to stop a service, or the restart option to restart a service.
To view the available options for the systemctl command, you can use the --help option. For example:
systemctl --help
This will display a list of all available options and their descriptions.
It's important to note that the systemctl command is only available on systems that use the systemd service manager. If you are using a different service manager, such as sysvinit or upstart, you will need to use a different command to manage system services.