%entities; ]> systemd-debug-generator systemd systemd-debug-generator 8 systemd-debug-generator Generator for enabling a runtime debug shell and masking specific units at boot /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 or 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 systemctl1'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. is honored only by initial RAM disk (initrd) while is honored only in the main system. If the or 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. is honored only by initial RAM disk (initrd) while is honored only in the main system. If the or 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, &DEBUGTTY; 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 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 systemctl1's enable command. is honored only by initial RAM disk (initrd) while is honored only in the main system. systemd-debug-generator implements systemd.generator7. 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. 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. Only one drop-in per unit can be 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. See Also systemd1 systemctl1 kernel-command-line7