1 <?xml version='
1.0'
?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
6 <refentry id=
"kernel-command-line">
9 <title>kernel-command-line
</title>
10 <productname>systemd
</productname>
14 <refentrytitle>kernel-command-line
</refentrytitle>
15 <manvolnum>7</manvolnum>
19 <refname>kernel-command-line
</refname>
20 <refpurpose>Kernel command line parameters
</refpurpose>
24 <para><filename>/proc/cmdline
</filename></para>
28 <title>Description
</title>
30 <para>The kernel, the programs running in the initrd and in the host system may be configured at boot via
31 kernel command line arguments. In addition, various systemd tools look at the EFI variable
32 <literal>SystemdOptions
</literal> (if available). Both sources are combined, but the kernel command line
33 has higher priority. Please note that
<emphasis>the EFI variable is only used by systemd tools, and is
34 ignored by the kernel and other user space tools
</emphasis>, so it is not a replacement for the kernel
37 <para>For command line parameters understood by the kernel, please
39 <ulink url=
"https://docs.kernel.org/admin-guide/kernel-parameters.html"><filename>kernel-parameters.html
</filename></ulink>
41 <citerefentry project='man-pages'
><refentrytitle>bootparam
</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
</para>
43 <para>For command line parameters understood by the initrd, see
44 <citerefentry project='man-pages'
><refentrytitle>dracut.cmdline
</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
45 or the documentation of the specific initrd implementation of your
50 <title>Core OS Command Line Arguments
</title>
52 <variablelist class='kernel-commandline-options'
>
54 <term><varname>systemd.unit=
</varname></term>
55 <term><varname>rd.systemd.unit=
</varname></term>
56 <term><varname>systemd.dump_core
</varname></term>
57 <term><varname>systemd.early_core_pattern=
</varname></term>
58 <term><varname>systemd.crash_chvt
</varname></term>
59 <term><varname>systemd.crash_shell
</varname></term>
60 <term><varname>systemd.crash_reboot
</varname></term>
61 <term><varname>systemd.confirm_spawn
</varname></term>
62 <term><varname>systemd.service_watchdogs
</varname></term>
63 <term><varname>systemd.show_status
</varname></term>
64 <term><varname>systemd.status_unit_format=
</varname></term>
65 <term><varname>systemd.log_target=
</varname></term>
66 <term><varname>systemd.log_level=
</varname></term>
67 <term><varname>systemd.log_location=
</varname></term>
68 <term><varname>systemd.log_color
</varname></term>
69 <term><varname>systemd.log_ratelimit_kmsg
</varname></term>
70 <term><varname>systemd.default_standard_output=
</varname></term>
71 <term><varname>systemd.default_standard_error=
</varname></term>
72 <term><varname>systemd.setenv=
</varname></term>
73 <term><varname>systemd.machine_id=
</varname></term>
74 <term><varname>systemd.set_credential=
</varname></term>
75 <term><varname>systemd.import_credentials=
</varname></term>
76 <term><varname>systemd.reload_limit_interval_sec=
</varname></term>
77 <term><varname>systemd.reload_limit_burst=
</varname></term>
79 <para>Parameters understood by the system and service
80 manager to control system behavior. For details, see
81 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
86 <term><varname>systemd.mask=
</varname></term>
87 <term><varname>systemd.wants=
</varname></term>
88 <term><varname>systemd.debug_shell
</varname></term>
90 <para>Additional parameters understood by
91 <citerefentry><refentrytitle>systemd-debug-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
92 to mask or start specific units at boot, or invoke a debug
98 <term><varname>systemd.run=
</varname></term>
99 <term><varname>systemd.run_success_action=
</varname></term>
100 <term><varname>systemd.run_failure_action=
</varname></term>
102 <para>Additional parameters understood by
103 <citerefentry><refentrytitle>systemd-run-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>, to
104 run a command line specified on the kernel command line as system service after booting up.
</para>
109 <term><varname>systemd.early_core_pattern=
</varname></term>
111 <para>During early boot, the generation of core dump files is disabled until a core dump handler (if any)
112 takes over. This parameter allows specifying an absolute path where core dump files should be stored until
113 a handler is installed. The path should be absolute and may contain specifiers, see
114 <citerefentry project='man-pages'
><refentrytitle>core
</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.
</para>
119 <term><varname>systemd.restore_state=
</varname></term>
121 <para>This parameter is understood by several system tools
122 to control whether or not they should restore system state
123 from the previous boot. For details, see
124 <citerefentry><refentrytitle>systemd-backlight@.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
126 <citerefentry><refentrytitle>systemd-rfkill.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
132 <term><varname>systemd.volatile=
</varname></term>
134 <para>This parameter controls whether the system shall boot up in volatile mode. Takes a boolean argument, or
135 the special value
<literal>state
</literal>. If false (the default), normal boot mode is selected, the root
136 directory and
<filename>/var/
</filename> are mounted as specified on the kernel command line or
137 <filename>/etc/fstab
</filename>, or otherwise configured. If true, full state-less boot mode is selected. In
138 this case the root directory is mounted as volatile memory file system (
<literal>tmpfs
</literal>), and only
139 <filename>/usr/
</filename> is mounted from the file system configured as root device, in read-only mode. This
140 enables fully state-less boots were the vendor-supplied OS is used as shipped, with only default
141 configuration and no stored state in effect, as
<filename>/etc/
</filename> and
<filename>/var/
</filename> (as
142 well as all other resources shipped in the root file system) are reset at boot and lost on shutdown. If this
143 setting is set to
<literal>state
</literal> the root file system is mounted read-only, however
144 <filename>/var/
</filename> is mounted as a volatile memory file system (
<literal>tmpfs
</literal>), so that the
145 system boots up with the normal configuration applied, but all state reset at boot and lost at shutdown. If
146 this setting is set to
<literal>overlay
</literal> the root file system is set up as
147 <literal>overlayfs
</literal> mount combining the read-only root directory with a writable
148 <literal>tmpfs
</literal>, so that no modifications are made to disk, but the file system may be modified
149 nonetheless with all changes being lost at reboot. For details, see
150 <citerefentry><refentrytitle>systemd-volatile-root.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
152 <citerefentry><refentrytitle>systemd-fstab-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
157 <term><varname>quiet
</varname></term>
159 <para>Parameter understood by both the kernel and the system
160 and service manager to control console log verbosity. For
162 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
167 <term><varname>debug
</varname></term>
169 <para>Parameter understood by both the kernel and the system
170 and service manager to control console log verbosity. For
172 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
177 <term><varname>-b
</varname></term>
178 <term><varname>rd.emergency
</varname></term>
179 <term><varname>emergency
</varname></term>
180 <term><varname>rd.rescue
</varname></term>
181 <term><varname>rescue
</varname></term>
182 <term><varname>single
</varname></term>
183 <term><varname>s
</varname></term>
184 <term><varname>S
</varname></term>
185 <term><varname>1</varname></term>
186 <term><varname>2</varname></term>
187 <term><varname>3</varname></term>
188 <term><varname>4</varname></term>
189 <term><varname>5</varname></term>
191 <para>Parameters understood by the system and service
192 manager, as compatibility and convenience options. For details, see
193 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
198 <term><varname>locale.LANG=
</varname></term>
199 <term><varname>locale.LANGUAGE=
</varname></term>
200 <term><varname>locale.LC_CTYPE=
</varname></term>
201 <term><varname>locale.LC_NUMERIC=
</varname></term>
202 <term><varname>locale.LC_TIME=
</varname></term>
203 <term><varname>locale.LC_COLLATE=
</varname></term>
204 <term><varname>locale.LC_MONETARY=
</varname></term>
205 <term><varname>locale.LC_MESSAGES=
</varname></term>
206 <term><varname>locale.LC_PAPER=
</varname></term>
207 <term><varname>locale.LC_NAME=
</varname></term>
208 <term><varname>locale.LC_ADDRESS=
</varname></term>
209 <term><varname>locale.LC_TELEPHONE=
</varname></term>
210 <term><varname>locale.LC_MEASUREMENT=
</varname></term>
211 <term><varname>locale.LC_IDENTIFICATION=
</varname></term>
213 <para>Parameters understood by the system and service
214 manager to control locale and language settings. For
216 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
221 <term><varname>fsck.mode=
</varname></term>
222 <term><varname>fsck.repair=
</varname></term>
225 <para>Parameters understood by the file system checker
226 services. For details, see
227 <citerefentry><refentrytitle>systemd-fsck@.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
232 <term><varname>quotacheck.mode=
</varname></term>
235 <para>Parameter understood by the file quota checker
236 service. For details, see
237 <citerefentry><refentrytitle>systemd-quotacheck.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
242 <term><varname>systemd.journald.forward_to_syslog=
</varname></term>
243 <term><varname>systemd.journald.forward_to_kmsg=
</varname></term>
244 <term><varname>systemd.journald.forward_to_console=
</varname></term>
245 <term><varname>systemd.journald.forward_to_wall=
</varname></term>
248 <para>Parameters understood by the journal service. For
250 <citerefentry><refentrytitle>systemd-journald.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
255 <term><varname>vconsole.keymap=
</varname></term>
256 <term><varname>vconsole.keymap_toggle=
</varname></term>
257 <term><varname>vconsole.font=
</varname></term>
258 <term><varname>vconsole.font_map=
</varname></term>
259 <term><varname>vconsole.font_unimap=
</varname></term>
262 <para>Parameters understood by the virtual console setup logic. For details, see
263 <citerefentry><refentrytitle>vconsole.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
268 <term><varname>udev.log_level=
</varname></term>
269 <term><varname>rd.udev.log_level=
</varname></term>
270 <term><varname>udev.children_max=
</varname></term>
271 <term><varname>rd.udev.children_max=
</varname></term>
272 <term><varname>udev.exec_delay=
</varname></term>
273 <term><varname>rd.udev.exec_delay=
</varname></term>
274 <term><varname>udev.event_timeout=
</varname></term>
275 <term><varname>rd.udev.event_timeout=
</varname></term>
276 <term><varname>udev.timeout_signal=
</varname></term>
277 <term><varname>rd.udev.timeout_signal=
</varname></term>
278 <term><varname>udev.blockdev_read_only
</varname></term>
279 <term><varname>rd.udev.blockdev_read_only
</varname></term>
280 <term><varname>net.ifnames=
</varname></term>
281 <term><varname>net.naming-scheme=
</varname></term>
284 <para>Parameters understood by the device event managing
285 daemon. For details, see
286 <citerefentry><refentrytitle>systemd-udevd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
291 <term><varname>plymouth.enable=
</varname></term>
294 <para>May be used to disable the Plymouth boot splash. For
296 <citerefentry project='die-net'
><refentrytitle>plymouth
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
301 <term><varname>luks=
</varname></term>
302 <term><varname>rd.luks=
</varname></term>
303 <term><varname>luks.crypttab=
</varname></term>
304 <term><varname>rd.luks.crypttab=
</varname></term>
305 <term><varname>luks.name=
</varname></term>
306 <term><varname>rd.luks.name=
</varname></term>
307 <term><varname>luks.uuid=
</varname></term>
308 <term><varname>rd.luks.uuid=
</varname></term>
309 <term><varname>luks.options=
</varname></term>
310 <term><varname>rd.luks.options=
</varname></term>
311 <term><varname>luks.key=
</varname></term>
312 <term><varname>rd.luks.key=
</varname></term>
315 <para>Configures the LUKS full-disk encryption logic at
316 boot. For details, see
317 <citerefentry><refentrytitle>systemd-cryptsetup-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
322 <term><varname>fstab=
</varname></term>
323 <term><varname>rd.fstab=
</varname></term>
326 <para>Configures the
<filename>/etc/fstab
</filename> logic
327 at boot. For details, see
328 <citerefentry><refentrytitle>systemd-fstab-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
333 <term><varname>root=
</varname></term>
334 <term><varname>rootfstype=
</varname></term>
335 <term><varname>rootflags=
</varname></term>
336 <term><varname>ro
</varname></term>
337 <term><varname>rw
</varname></term>
340 <para>Configures the root file system and its file system type and mount options, as well as
341 whether it shall be mounted read-only or read-write initially. For details, see
342 <citerefentry><refentrytitle>systemd-fstab-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
344 <para>If
<varname>root=
</varname> is not set (or set to
<literal>gpt-auto
</literal>) the automatic
345 root partition discovery implemented by
346 <citerefentry><refentrytitle>systemd-gpt-auto-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
347 will be in effect. In this case
<varname>rootfstype=
</varname>,
<varname>rootflags=
</varname>,
348 <varname>ro
</varname>,
<varname>rw
</varname> will be interpreted by
349 <command>systemd-gpt-auto-generator
</command>.
</para>
354 <term><varname>mount.usr=
</varname></term>
355 <term><varname>mount.usrfstype=
</varname></term>
356 <term><varname>mount.usrflags=
</varname></term>
359 <para>Configures the /usr file system (if required) and
360 its file system type and mount options. For details, see
361 <citerefentry><refentrytitle>systemd-fstab-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
366 <term><varname>veritytab=
</varname></term>
367 <term><varname>rd.veritytab=
</varname></term>
368 <term><varname>roothash=
</varname></term>
369 <term><varname>systemd.verity=
</varname></term>
370 <term><varname>rd.systemd.verity=
</varname></term>
371 <term><varname>systemd.verity_root_data=
</varname></term>
372 <term><varname>systemd.verity_root_hash=
</varname></term>
373 <term><varname>systemd.verity.root_options=
</varname></term>
374 <term><varname>usrhash=
</varname></term>
375 <term><varname>systemd.verity_usr_data=
</varname></term>
376 <term><varname>systemd.verity_usr_hash=
</varname></term>
377 <term><varname>systemd.verity_usr_options=
</varname></term>
379 <para>Configures the integrity protection root hash for the root and
<filename>/usr
</filename> file systems, and other related
380 parameters. For details, see
381 <citerefentry><refentrytitle>systemd-veritysetup-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
386 <term><varname>systemd.getty_auto=
</varname></term>
389 <para>Configures whether the
<filename>serial-getty@.service
</filename> will run.
391 <citerefentry><refentrytitle>systemd-getty-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
396 <term><varname>systemd.gpt_auto=
</varname></term>
397 <term><varname>rd.systemd.gpt_auto=
</varname></term>
400 <para>Configures whether GPT-based partition auto-discovery shall be attempted. For details, see
401 <citerefentry><refentrytitle>systemd-gpt-auto-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
406 <term><varname>systemd.image_policy=
</varname></term>
407 <term><varname>rd.systemd.image_policy=
</varname></term>
409 <listitem><para>When GPT-based partition auto-discovery is used, configures the image dissection
410 policy string to apply, as per
411 <citerefentry><refentrytitle>systemd.image-policy
</refentrytitle><manvolnum>7</manvolnum></citerefentry>. For
413 <citerefentry><refentrytitle>systemd-gpt-auto-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para></listitem>
417 <term><varname>systemd.default_timeout_start_sec=
</varname></term>
420 <para>Overrides the default start job timeout
<varname>DefaultTimeoutStartSec=
</varname> at
421 boot. For details, see
422 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
427 <term><varname>systemd.watchdog_device=
</varname></term>
430 <para>Overrides the watchdog device path
<varname>WatchdogDevice=
</varname>. For details, see
431 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
436 <term><varname>systemd.watchdog_sec=
</varname></term>
439 <para>Overrides the watchdog timeout settings otherwise configured with
440 <varname>RuntimeWatchdog=
</varname>,
<varname>RebootWatchdog=
</varname> and
441 <varname>KExecWatchdogSec=
</varname>. Takes a time value (if no unit is specified, seconds is the
442 implicitly assumed time unit) or the special strings
<literal>off
</literal> or
443 <literal>default
</literal>. For details, see
444 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
449 <term><varname>systemd.watchdog_pre_sec=
</varname></term>
452 <para>Overrides the watchdog pre-timeout settings otherwise configured with
453 <varname>RuntimeWatchdogPreSec=
</varname>. Takes a time value (if no unit is specified, seconds is the
454 implicitly assumed time unit) or the special strings
<literal>off
</literal> or
455 <literal>default
</literal>. For details, see
456 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
461 <term><varname>systemd.watchdog_pretimeout_governor=
</varname></term>
464 <para>Overrides the watchdog pre-timeout settings otherwise configured with
465 <varname>RuntimeWatchdogPreGovernor=
</varname>. Takes a string value. For details, see
466 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
471 <term><varname>systemd.cpu_affinity=
</varname></term>
474 <para>Overrides the CPU affinity mask for the service manager and the default for all child
475 processes it forks. This takes precedence over
<varname>CPUAffinity=
</varname>, see
476 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
482 <term><varname>modules_load=
</varname></term>
483 <term><varname>rd.modules_load=
</varname></term>
486 <para>Load a specific kernel module early at boot. For
488 <citerefentry><refentrytitle>systemd-modules-load.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
493 <term><varname>nameserver=
</varname></term>
494 <term><varname>domain=
</varname></term>
496 <listitem><para>Configures DNS server information and search domains, see
497 <citerefentry><refentrytitle>systemd-resolved.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
498 for details.
</para></listitem>
502 <term><varname>resume=
</varname></term>
503 <term><varname>resumeflags=
</varname></term>
506 <para>Enables resume from hibernation using the specified
507 device and mount options. All
508 <citerefentry project='man-pages'
><refentrytitle>fstab
</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like
509 paths are supported. For details, see
510 <citerefentry><refentrytitle>systemd-hibernate-resume-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
515 <term><varname>systemd.firstboot=
</varname></term>
517 <listitem><para>Takes a boolean argument, defaults to on. If off,
518 <citerefentry><refentrytitle>systemd-firstboot.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
519 will not query the user for basic system settings, even if the system boots up for the first time and
520 the relevant settings are not initialized yet. Not to be confused with
521 <varname>systemd.condition-first-boot=
</varname> (see below), which overrides the result of the
522 <varname>ConditionFirstBoot=
</varname> unit file condition, and thus controls more than just
523 <filename>systemd-firstboot.service
</filename> behaviour.
</para></listitem>
527 <term><varname>systemd.condition-needs-update=
</varname></term>
529 <listitem><para>Takes a boolean argument. If specified, overrides the result of
530 <varname>ConditionNeedsUpdate=
</varname> unit condition checks. See
531 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
532 details.
</para></listitem>
536 <term><varname>systemd.condition-first-boot=
</varname></term>
538 <listitem><para>Takes a boolean argument. If specified, overrides the result of
539 <varname>ConditionFirstBoot=
</varname> unit condition checks. See
540 <citerefentry><refentrytitle>systemd.unit
</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
541 details. Not to be confused with
<varname>systemd.firstboot=
</varname> which only controls behaviour
542 of the
<filename>systemd-firstboot.service
</filename> system service but has no effect on the
543 condition check (see above).
</para></listitem>
547 <term><varname>systemd.clock-usec=
</varname></term>
549 <listitem><para>Takes a decimal, numeric timestamp in µs since January
1st
1970,
00:
00am, to set the
550 system clock to. The system time is set to the specified timestamp early during boot. It is not
551 propagated to the hardware clock (RTC).
</para></listitem>
555 <term><varname>systemd.random-seed=
</varname></term>
557 <listitem><para>Takes a base64 encoded random seed value to credit with full entropy to the kernel's
558 random pool during early service manager initialization. This option is useful in testing
559 environments where delays due to random pool initialization in entropy starved virtual machines shall
562 <para>Note that if this option is used the seed is accessible to unprivileged programs from
563 <filename>/proc/cmdline
</filename>. This option is hence a security risk when used outside of test
564 systems, since the (possibly) only seed used for initialization of the kernel's entropy pool might be
565 easily acquired by unprivileged programs.
</para>
567 <para>It is recommended to pass
512 bytes of randomized data (as that matches the Linux kernel pool
568 size), which may be generated with a command like the following:
</para>
570 <programlisting>dd if=/dev/urandom bs=
512 count=
1 status=none | base64 -w
0</programlisting>
572 <para>Again: do not use this option outside of testing environments, it's a security risk elsewhere,
573 as secret key material derived from the entropy pool can possibly be reconstructed by unprivileged
579 <term><varname>systemd.hostname=
</varname></term>
581 <listitem><para>Accepts a hostname to set during early boot. If specified takes precedence over what
582 is set in
<filename>/etc/hostname
</filename>. Note that this does not bar later runtime changes to
583 the hostname, it simply controls the initial hostname set during early boot.
</para></listitem>
587 <term><varname>systemd.tty.term.
<replaceable>tty
</replaceable>=
</varname></term>
588 <term><varname>systemd.tty.rows.
<replaceable>tty
</replaceable>=
</varname></term>
589 <term><varname>systemd.tty.columns.
<replaceable>tty
</replaceable>=
</varname></term>
591 <listitem><para>These arguments allow configuring default values for
<varname>$TERM
</varname>,
592 <varname>TTYRows=
</varname>, and
<varname>TTYColumns=
</varname> for tty
593 <replaceable>tty
</replaceable>. The tty name should be specified without the
594 <filename>/dev/
</filename> prefix (e.g.
<literal>systemd.tty.rows.ttyS0=
80</literal>).
601 <title>History
</title>
605 <term>systemd
252</term>
606 <listitem><para>Kernel command-line arguments
<varname>systemd.unified_cgroup_hierarchy
</varname>
607 and
<varname>systemd.legacy_systemd_cgroup_controller
</varname> were deprecated. Please switch to
608 the unified cgroup hierarchy.
</para></listitem>
614 <title>See Also
</title>
616 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
617 <citerefentry><refentrytitle>systemd-system.conf
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
618 <citerefentry project='man-pages'
><refentrytitle>bootparam
</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
619 <citerefentry project='man-pages'
><refentrytitle>dracut.cmdline
</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
620 <citerefentry><refentrytitle>systemd-debug-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
621 <citerefentry><refentrytitle>systemd-fsck@.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
622 <citerefentry><refentrytitle>systemd-quotacheck.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
623 <citerefentry><refentrytitle>systemd-journald.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
624 <citerefentry><refentrytitle>systemd-vconsole-setup.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
625 <citerefentry><refentrytitle>systemd-udevd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
626 <citerefentry project='die-net'
><refentrytitle>plymouth
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
627 <citerefentry><refentrytitle>systemd-cryptsetup-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
628 <citerefentry><refentrytitle>systemd-veritysetup-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
629 <citerefentry><refentrytitle>systemd-fstab-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
630 <citerefentry><refentrytitle>systemd-getty-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
631 <citerefentry><refentrytitle>systemd-gpt-auto-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
632 <citerefentry><refentrytitle>systemd-volatile-root.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
633 <citerefentry><refentrytitle>systemd-modules-load.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
634 <citerefentry><refentrytitle>systemd-backlight@.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
635 <citerefentry><refentrytitle>systemd-rfkill.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
636 <citerefentry><refentrytitle>systemd-hibernate-resume-generator
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
637 <citerefentry><refentrytitle>systemd-firstboot.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
638 <citerefentry><refentrytitle>bootctl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>