Systemd
systemd is a Linux initialization system and service manager introduced in 2010 and adopted by default in RHEL 7.0 (2014), 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
journalctlandsystemd-cat - resource management
Config files:
/etc/systemd/logind.conf
Systemd components of daemons and binaries[4]:
- systemd:
systemctl - systemd-journald:
journalctl - systemd-logind:
loginctl - systemd-networkd:
networkctl, netplan - systemd-timesyncd
- systemd-resolved: systemd-resolve,
hostnamectl - systemd-udevd
/lib/systemd/systemd-fsck
Activities
- Read systemd for Administrators: http://0pointer.de/blog/projects/resources.html
See also
- Systemd:
systemctl,systemd-journald,journalctlsystemd-cat,systemd-logind,systemd-networkd:networkctl,systemd-timesyncd,systemd-resolved,systemd-udevd[5],Systemd-logind: loginctl,hostnamectl,udevadm,systemd-run,portablectl,systemd-nspawn, systemd resource management, Timer (systemd), systemd logs,/etc/systemd/, systemd services,systemd-mount,/run/systemd/,.service,/usr/lib/systemd/,/usr/lib/systemd/system/,/usr/lib/systemd/system/systemd-resolved.service,/lib/systemd/, machinectl, systemd-oomd, systemd-analyze - macOS:
launctl - systemd, daemontools, runit and https://en.wikipedia.org/wiki/Process_supervision
systemd,runsvcron,crontab,systemctl list-timers, anacron, Kubernetes scheduler, Systemd services,CronJobsStack,cron.schedule,crontab -l,0x004b,at, /etc/cron.deny, /etc/cron.allow, /etc/crontab, /var/spool/cron/crontabs/- elogind
- /run/
- init (
inittab), supervisor, systemd, upstart,service,chkconfig, OpenRC, s6-svstat
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