Target units are named rather than numbered and serve specific purposes.įor example, the targets local-fs.target and swap.target mount local file systems and swap spaces. However, it remains fully compatible with the runlevel concept. Systemd introduces a new concept by using so-called “ target units”. Runlevels are numbered the most commonly known ones are 0 (shutting down the system), 3 (multiuser with network) and 5 (multiuser with network and display manager). With System V init the system was booted into a so-called “ Runlevel”.Ī runlevel defines how the system is started and what services are available in the running system. Information about a device unit as exposed in the sysfs/udev(7) device tree fileĪ concept for hierarchically managing resources of a group of processes file endsįor more information about systemd unit files, see Information about a swap device or file for memory paging file ends with. Information about a file system automount point file ends with. Usually auto-generated by the fstab generator file ends with. Information about a timer controlled, for timer-based activation file ends with Used to trigger other units (for example running a service when files change) Information about an IPC or network socket or a file system FIFO, for Used for grouping units and as synchronization points during start-up file Information about a process (for example running a daemon) file ends with
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