systemd-debug-generator(8) — Linux manual page

SYSTEMD-...GENERATOR(8)  systemd-debug-generator SYSTEMD-...GENERATOR(8)

NAME

       systemd-debug-generator - Generator for enabling a runtime debug
       shell and masking specific units at boot

SYNOPSIS

       /usr/lib/systemd/system-generators/systemd-debug-generator

DESCRIPTION

       systemd-debug-generator is a generator that reads the kernel
       command line and understands three options:

       If the systemd.mask= or rd.systemd.mask= option is specified and
       followed by a unit name, this unit is masked for the runtime
       (i.e. for this session — from boot to shutdown), similarly to the
       effect of systemctl(1)'s mask command. This is useful to boot
       with certain units removed from the initial boot transaction for
       debugging system startup. May be specified more than once.
       rd.systemd.mask= is honored only by initial RAM disk (initrd)
       while systemd.mask= is honored only in the main system.

       If the systemd.wants= or rd.systemd.wants= option is specified
       and followed by a unit name, a start job for this unit is added
       to the initial transaction. This is useful to start one or more
       additional units at boot. May be specified more than once.
       rd.systemd.wants= is honored only by initial RAM disk (initrd)
       while systemd.wants= is honored only in the main system.

       If the systemd.debug_shell or rd.systemd.debug_shell option is
       specified, the debug shell service "debug-shell.service" is
       pulled into the boot transaction and a debug shell will be
       spawned during early boot. By default, /dev/tty9 is used, but a
       specific tty can also be specified, either with or without the
       /dev/ prefix. To set the tty to use without enabling the debug
       shell, the systemd.default_debug_tty= option can be used which
       also takes a tty with or without the /dev/ prefix. Note that the
       shell may also be turned on persistently by enabling it with
       systemctl(1)'s enable command.  rd.systemd.debug_shell is honored
       only by initial RAM disk (initrd) while systemd.debug_shell is
       honored only in the main system.

       systemd-debug-generator implements systemd.generator(7).

SYSTEM CREDENTIALS

       systemd.extra-unit.*
           Credentials prefixed with "systemd.extra-unit."  specify
           additional units to add to the final system. Note that these
           additional units are added to both the initrd and the final
           system.  ConditionPathExists=!/etc/initrd-release can be used
           to make sure the unit is conditioned out in the initrd. Note
           that this can also be used to mask units, by simply
           specifying an empty value.

           Added in version 256.

       systemd.unit-dropin.*
           Credentials prefixed with "systemd.unit-dropin."  add
           drop-ins for the corresponding units in the final system.
           Each credential must be suffixed with the full unit name
           including the unit extension. Its contents must be a valid
           unit drop-in file. Optionally, the unit name may be followed
           with "~", followed by the drop-in name without the ".conf"
           suffix. If not specified, the name of the generated drop-in
           will be "50-credential.conf". Note that these additional
           drop-ins are added to both the initrd and the final system.

           Added in version 256.

SEE ALSO

       systemd(1), systemctl(1), kernel-command-line(7)

COLOPHON

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2024-06-13.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 257~devel                                SYSTEMD-...GENERATOR(8)

Pages that refer to this page: kernel-command-line(7), systemd.directives(7), systemd.generator(7), systemd.index(7), systemd.system-credentials(7)

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