The system daemon (systemd)

Systemd is a core component of many Linux distributions. Since its birth in 2010, systemd has gradually been adopted as the core init system, responsible for handling services and boot-up operations.

Throughout its development phase, several other components have been added to the systemd portfolio:

• D-Bus has been merged with systemd and offers a system and session bus service, allowing the use of D-Bus for inter-application communication

• Udev has been merged with systemd as well, offering a flexible device-node management application

• Login capabilities have been added to systemd, enabling fine-grained control over user sessions

• The journald daemon has been added to provide a new approach to system and service logging, replacing some of the functionality of standard system loggers

• The timerd daemon provides support for the time-based execution of tasks, replacing some of the functionality of standard cron daemons

• Network configurations can be managed by systemd-networkd...