systemd-getty-generator — Generator for enabling getty instances on the console
/usr/lib/systemd/system-generators/systemd-getty-generator
systemd-getty-generator is a generator that automatically instantiates
serial-getty@.service on the kernel consoles, if they can function as ttys and are
not provided by the virtual console subsystem. It will also instantiate
serial-getty@.service instances for virtualizer consoles, if execution in a
virtualized environment is detected. If execution in a container environment is detected, it will instead
enable console-getty.service for /dev/console, and
container-getty@.service instances for additional container pseudo TTYs as requested
by the container manager (see Container
Interface). This should ensure that the user is shown a login prompt at the right
place, regardless of which environment the system is started in. For example, it is sufficient to
redirect the kernel console with a kernel command line argument such as console= to
get both kernel messages and a getty prompt on a serial TTY. See The kernel's command-line
parameters for more information on the console= kernel parameter.
systemd-getty-generator implements
systemd.generator(7).
Further information about configuration of gettys can be found in systemd for Administrators, Part XVI: Gettys on Serial Consoles (and Elsewhere).
systemd-getty-generator understands the following
kernel-command-line(7)
parameters:
systemd.getty_auto=¶This kernel command line option may be used to control the execution mode of the generator.
Takes an optional boolean argument. Since v258, this also takes comma-separated list of special
values: "credential", "container", "console",
and "builtin".
When "credential" is specified, the two credentials
getty.ttys.serial and getty.ttys.container will be parsed.
See System Credentials section below for more details.
When "container" is specified, console-getty.service
and container-getty@.service will be enabled when the system is running in a
container. This option will be ignored when the system is not in a container.
When "console" is specified, serial-getty@.service for
active kernel consoles will be enabled. This option will be ignored when the system is running in a
container.
When "builtins" is specified, serial-getty@.service for
available virtualizer consoles will be enabled. This option will be ignored when the system is
running in a container.
When yes, the above four options will be enabled. When no, all options are disabled and no service will be enabled. When the kernel command line option is specified without an argument, defaults to yes. The generator is enabled by default, and a false value may be used to disable it.
$SYSTEMD_GETTY_AUTO¶This environment variable may be used to control the execution mode of the generator.
Takes the same value as systemd.getty_auto= kernel command line option.
getty.auto¶The system credential may be used to control the execution mode of the generator.
Takes the same value as systemd.getty_auto= kernel command line option.
getty.ttys.serial, getty.ttys.container¶These system credentials may be used to spawn additional login prompts on selected
TTYs. The two credentials should contain a newline-separated list of TTY names to spawn instances of
serial-getty@.service (in case of getty.ttys.serial) and
container-getty@.service (in case of getty.ttys.container)
on. Any lines starting with a "#" will be ignored.