Difference between revisions of "Automatic login to virtual console"

From ArchWiki
Jump to: navigation, search
m (Use drop-in feature of systemd for getty autologin: surrounds code in ic blocks, see Help:Style)
(simplification and beautification of wikilinks, fixing whitespace, capitalization and section fragments (https://github.com/lahwaacz/wiki-scripts/blob/master/link-checker.py (interactive)))
 
(41 intermediate revisions by 23 users not shown)
Line 2: Line 2:
 
[[Category:Security]]
 
[[Category:Security]]
 
[[es:Automatic login to virtual console]]
 
[[es:Automatic login to virtual console]]
 +
[[fr:Connexion automatique a la console]]
 
[[it:Automatic login to virtual console]]
 
[[it:Automatic login to virtual console]]
{{Article summary start}}
+
[[ja:仮想端末に自動ログイン]]
{{Article summary text|Describes how to automatically log in to a virtual console.}}
+
[[ru:Automatic login to virtual console]]
{{Article summary heading|Related}}
+
{{Related articles start}}
{{Article summary wiki|Display Manager}}
+
{{Related|Display manager}}
{{Article summary wiki|Silent boot}}
+
{{Related|Silent boot}}
{{Article summary wiki|Start X at Login}}
+
{{Related|Start X at login}}
{{Article summary end}}
+
{{Related articles end}}
  
This article describes how to automatically log in to a ''virtual console'' at the end of the [[boot process]]. This article only covers console log-ins; methods for starting an [[Xorg|X server]] are described in [[Start X at Login]].
+
This article describes how to automatically log in to a [[Wikipedia:Virtual console|virtual console]] at the end of the [[boot process]]. This article only covers console log-ins; see [[Start X at login]] for information about automatic login into [[Xorg]].
  
== Installation ==
+
== Configuration ==
=== Use drop-in feature of systemd for getty autologin ===
+
First create a new directory named {{ic|getty@tty1.service.d}} under {{ic|/etc/systemd/system}}:
+
  
# mkdir /etc/systemd/system/getty@tty1.service.d
+
Configuration relies on systemd [[Systemd#Editing provided units|drop-in files]] to override the default parameters passed to ''agetty''.
  
Then create a new file named {{ic|autologin.conf}} and add it into the directory:
+
Configuration differs for virtual versus serial consoles. In most cases, you want to set up automatic login on a virtual console, (whose device name is {{ic|tty''N''}}, where {{ic|''N''}} is a number). The configuration of automatic login for serial consoles will be slightly different. Device names of the serial consoles look like {{ic|ttyS''N''}}, where {{ic|''N''}} is a number.
  
{{hc|/etc/systemd/system/getty@tty1.service.d/autologin.conf|
+
=== Virtual console ===
2=[Service]
+
 
 +
[[systemd#Editing provided units|Edit the provided unit]] either manually by creating the following drop-in snippet, or by running {{ic|systemctl edit getty@tty1}} and pasting its content:
 +
 
 +
{{hc|/etc/systemd/system/getty@tty1.service.d/override.conf|2=
 +
[Service]
 
ExecStart=
 
ExecStart=
ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
+
ExecStart=-/usr/bin/agetty --autologin ''username'' --noclear %I $TERM
 
}}
 
}}
  
{{Tip|The option {{ic|1=Type=idle}} will delay the execution of agetty until all jobs (state change requests to units) are completed. On the other hand it may cause systemd boot-up messages to pollute the login prompt. This option is more useful when [[Start X at Login|starting X automatically]]. See {{ic|man systemd.service}} for more info.}}
+
{{Tip|The option {{ic|1=Type=idle}} found in the default {{ic|getty@.service}} will delay the service startup until all jobs (state change requests to units) are completed in order to avoid polluting the login prompt with boot-up messages. When [[Start X at login|starting X automatically]], it may be useful to start {{ic|getty@tty1.service}} immediately by adding {{ic|1=Type=simple}} into the [[drop-in snippet]]. Both the init system and ''startx'' can be [[Silent boot|silenced]] to avoid the interleaving of their messages during boot-up.}}
  
By default, {{ic|getty@.service}} uses {{ic|1=Type=idle}}. If you want to use {{ic|1=Type=simple}}, then your {{ic|autologin.conf}} should look like this:
+
If you want to use a ''tty'' other than ''tty1'', see [[Systemd FAQ#How_do_I_change_the_default_number_of_gettys.3F|systemd FAQ]].
  
{{hc|/etc/systemd/system/getty@tty1.service.d/autologin.conf|
+
=== Serial console ===
2=[Service]
+
 
 +
Create the following file (and leading directories):
 +
 
 +
{{hc|/etc/systemd/system/serial-getty@ttyS0.service.d/autologin.conf|2=
 +
[Service]
 
ExecStart=
 
ExecStart=
ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
+
ExecStart=-/usr/bin/agetty --autologin ''username'' -s %I 115200,38400,9600 vt102
Type=simple
+
 
}}
 
}}
 
== Tips & Tricks ==
 
 
=== Avoiding unnecessary dmesg errors ===
 
To avoid errors related to {{ic|display-manager.service}} in dmesg, you should set the default target to multi-user instead of graphical:
 
# systemctl enable multi-user.target
 
  
 
==See also==
 
==See also==
* [[Systemd#Change_default_target_to_boot_into|Change default runlevel/target to boot into]].
+
 
 +
* [[Systemd#Change_default_target_to_boot_into|Change default runlevel/target to boot into]]

Latest revision as of 14:24, 8 April 2016

This article describes how to automatically log in to a virtual console at the end of the boot process. This article only covers console log-ins; see Start X at login for information about automatic login into Xorg.

Configuration

Configuration relies on systemd drop-in files to override the default parameters passed to agetty.

Configuration differs for virtual versus serial consoles. In most cases, you want to set up automatic login on a virtual console, (whose device name is ttyN, where N is a number). The configuration of automatic login for serial consoles will be slightly different. Device names of the serial consoles look like ttySN, where N is a number.

Virtual console

Edit the provided unit either manually by creating the following drop-in snippet, or by running systemctl edit getty@tty1 and pasting its content:

/etc/systemd/system/getty@tty1.service.d/override.conf
[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin username --noclear %I $TERM
Tip: The option Type=idle found in the default getty@.service will delay the service startup until all jobs (state change requests to units) are completed in order to avoid polluting the login prompt with boot-up messages. When starting X automatically, it may be useful to start getty@tty1.service immediately by adding Type=simple into the drop-in snippet. Both the init system and startx can be silenced to avoid the interleaving of their messages during boot-up.

If you want to use a tty other than tty1, see systemd FAQ.

Serial console

Create the following file (and leading directories):

/etc/systemd/system/serial-getty@ttyS0.service.d/autologin.conf
[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin username -s %I 115200,38400,9600 vt102

See also