Name
systemd-debug-generator - Generator for enabling a runtime debug shell and masking specific units at bootSynopsis
/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), similar to the effect of systemctl(1)\*(Aqs 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)\*(Aqs 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).
See Also
systemd(1), systemctl(1), kernel-command-line(7)