systemd-debug-generator - Generator for enabling a runtime debug shell and
masking specific units at boot
/lib/systemd/system-generators/systemd-debug-generator
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 set, either 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).
systemd(1),
systemctl(1),
kernel-command-line(7)