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15th chunk of `init.man`
64910746755e628b241f3730923fbceba72f0aedc4a3b70b0000000100000c76
 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 This interface is obsolete and should not be used in new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 Command Line Options, Sockets/FIFOs, History, and Resources
Summary
This section describes systemd command-line options for logging, machine ID, service watchdogs, and default standard output/error settings. It also details the AF_UNIX datagram socket `/run/systemd/notify` for daemon status notifications, the AF_UNIX stream socket `/run/systemd/private` for internal systemctl communication, and the named pipe `/dev/initctl` for limited SysV client interface compatibility (now obsolete). It notes the deprecation of kernel command-line arguments `systemd.unified_cgroup_hierarchy` and `systemd.legacy_systemd_cgroup_controller` in systemd 252, urging users to switch to the unified cgroup hierarchy. Finally, it provides a list of "See Also" resources and "Notes" that link to important documentation and specifications related to systemd.