Compatible with LSB and UNIX System V init scripts
Being compatible with the LSB (Linux Standard Base) and UNIX System V init scripts, systemd uses D-Bus and socket activation for starting services, and provides aggressive parallelization capabilities. In addition it supports restoring and snapshotting of the system state, maintains automount and mount points, keeps track of processes by using Linux control groups, offers on-demand starting of daemons, and implements a complex transactional dependency-based service control logic.
A drop-in replacement for sysvinit
systemd is included in almost every kernel-based Linux operating system, and it can be used as a drop-in replacement for the sysvinit software, but also for the inetd, acpid, atd, watchdog, cron, syslog, and pm-utils daemons. The program also comes with a built-in login manager, called systemd-logind, designed as a drop-in replacement for the deprecated ConsoleKit software. It features various multiseat improvements.
Can administer network configurations
Since version 209, systemd can also administer network configurations, thanks to the integration of the networkd daemon. For example, it can statically assign IP addresses, as well as to provide basic bridging configuration.
Supported Linux distributions
Since its appearance, back in 2011, the project has been adopted quite fast by many popular Linux distributions, including Arch Linux, Fedora, Gentoo Linux, Mageia, openSUSE, Sabayon Linux, Frugalware Linux, Ångström, and CoreOS. In addition, many other powerful Linux operating system will adopt systemd in their forthcoming releases, such as Ubuntu 14.04 LTS (Trusty Tahr), Debian GNU/Linux 8 (Jessie), and Red Hat Enterprise Linux 7.
Even if some people tend to write SystemD, system d, system D or System D, the program’s name is spelled and written systemd. It is definitely the future of any Linux distribution, changing the way we interact with the operating system.
Reviewed by Marius Nestor, last updated on October 28th, 2014
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- journalctl gained the new options -t/--identifier= to match on the syslog identifier (aka "tag"), as well as --utc to show log timestamps in the UTC timezone. journalctl now also accepts -n/--lines=all to disable line capping in a pager.
- Services can notify the manager before they start a reload (by sending RELOADING=1) or shutdown (by sending STOPPING=1). This allows the manager to track and show the internal state of daemons and closes a race condition when the process is still running but has closed its D-Bus connection.
- Services with Type=oneshot do not have to have any ExecStart commands anymore.
- User units are now loaded also from $XDG_RUNTIME_DIR/systemd/user/. This is similar to the /run/systemd/user directory that was already previously supported, but is under the control of the user.
Application descriptionsystemd a modern program that can automatically start services and tasks during the boot process of any Linux distribu...