Home • Explore • Blog • CI
☰



man-pages
16th chunk of `systemd.man`
d75df79761afc88a42a53cd854133ae94e4bd882301f1ba10000000100000c9b
 messages. See systemd.log_color above.

       --log-level=
           Set log level. See systemd.log_level above.

       --log-location
           Include code location in log messages. See systemd.log_location
           above.

       --log-target=
           Set log target. See systemd.log_target above.

       --log-time=
           Prefix console messages with timestamp. See systemd.log_time above.

       --machine-id=
           Override the machine-id set on the hard drive. See
           systemd.machine_id= above.

       --service-watchdogs
           Globally enable/disable all service watchdog timeouts and emergency
           actions. See systemd.service_watchdogs above.

       --default-standard-output=, --default-standard-error=
           Sets the default output or error output for all services and
           sockets, respectively. See systemd.default_standard_output= and
           systemd.default_standard_error= above.

SOCKETS AND FIFOS
       /run/systemd/notify
           Daemon status notification socket. This is an AF_UNIX datagram
           socket and is used to implement the daemon notification logic as
           implemented by sd_notify(3).

       /run/systemd/private
           Used internally as communication channel between systemctl(1) and
           the systemd process. This is an AF_UNIX stream socket. This
           interface is private to systemd and should not be used in external
           projects.

       /dev/initctl
           Limited compatibility support for the SysV client interface, as
           implemented by the systemd-initctl.service unit. This is a named
           pipe in the file system. This interface is obsolete and should not
           be used in new applications.

HISTORY
       systemd 252
           Kernel command-line arguments systemd.unified_cgroup_hierarchy and
           systemd.legacy_systemd_cgroup_controller were deprecated. Please
           switch to the unified cgroup hierarchy.

SEE ALSO
       The systemd Homepage[9], systemd‐system.conf(5), locale.conf(5),
       systemctl(1), journalctl(1), systemd‐notify(1), daemon(7), sd‐daemon(3),
       org.freedesktop.systemd1(5), systemd.unit(5), systemd.special(7), pkg‐
       config(1), kernel‐command‐line(7), bootup(7), systemd.directives(7)

NOTES
        1. Control Groups v2
           https://docs.kernel.org/admin‐guide/cgroup‐v2.html

        2. Original Design Document
           http://0pointer.de/blog/projects/systemd.html

        3. Interface Portability and Stability Promise
           https://systemd.io/PORTABILITY_AND_STABILITY/

        4. Container Interface
           https://systemd.io/CONTAINER_INTERFACE

        5. initrd Interface
           https://systemd.io/INITRD_INTERFACE/

        6. XDG Base Directory specification
           https://standards.freedesktop.org/basedir‐spec/basedir‐spec‐latest.html

        7. Known Environment Variables
           https://systemd.io/ENVIRONMENT

        8. System and Service Credentials
           https://systemd.io/CREDENTIALS

        9. systemd Homepage
           https://systemd.io/

systemd 253                                                          SYSTEMD(1)
Title: Systemd Options, Sockets/FIFOs, History, and Further Resources
Summary
This section details systemd options for logging, machine ID, service watchdogs, and default I/O streams. It also describes the AF_UNIX sockets and FIFOs used for daemon status notification, internal communication, and SysV compatibility. The history notes the deprecation of cgroup hierarchy arguments, encouraging the use of a unified hierarchy. Finally, it provides links to related man pages, the systemd homepage, and various specifications and design documents.