systemd systemd.directives 7 systemd.directives Index of configuration directives Directives for configuring units, used in unit files. Kernel boot options for configuring the behaviour of the systemd process. Environment variables understood by the systemd manager and other programs and environment variable-compatible settings. EFI variables understood by systemd-boot7 and other programs. Directives for configuring home areas and user accounts via systemd-homed.service8. Directives for configuring systemd units through the udev database. Directives for configuring network links through the net-setup-link udev builtin and networks through systemd-networkd. Fields in the journal events with a well known meaning. Directives for configuring PAM behaviour. Options which influence mounted filesystems and encrypted volumes. Directives for configuring systemd-nspawn containers. Directives for configuring the behaviour of the systemd process and other tools through configuration files. Command-line options accepted by programs in the systemd suite. Various constant used and/or defined by systemd. Other configuration elements which don't fit in any of the above groups. Short strings which are substituted in configuration directives. Paths and file names referred to in the documentation. Interfaces exposed over D-Bus. Methods exposed in the D-Bus interface. Properties exposed in the D-Bus interface. Signals emitted in the D-Bus interface.