Systemd

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systemd is a Linux initialization system and service manager introduced in 2010 and adopted by default in RHEL 7.0, that includes features like:

On-demand starting of daemons
Inhibitor Locks which allows to block or delay system sleep and shutdown requests from the user ^[1]^[2]
Mount and automount point maintenance (systemd-mount^[3], systemd-umount )
Snapshot support
Processes tracking using Linux control groups (systemd-cglssystemd-cgtop)
Logging daemon, see journalctl and systemd-cat

Systemd components of daemons and binaries^[4]:

systemd: systemctl
systemd-journald: journalctl
systemd-logind
systemd-networkd: networkctl, netplan
systemd-timesyncd
systemd-resolved: systemd-resolve, hostnamectl
systemd-udevd

See also

↑ https://www.freedesktop.org/wiki/Software/systemd/inhibit/

↑ http://manpages.ubuntu.com/manpages/bionic/man1/systemd-inhibit.1.html

↑ https://www.freedesktop.org/software/systemd/man/systemd.mount.html

↑ https://wiki.ubuntu.com/DebuggingSystemd

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