Difference between revisions of "LXDM"
(→Configuration: reordered and added bit about face icons) |
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==Configuration== | ==Configuration== | ||
− | {{warning|1=The language select control in '''lxdm.conf''' is sometimes required and sometimes not. Set '''lang=''' to inverse value of itself when LXDM potentially enters a boot loop and fails to load | + | {{warning|1=The language select control in '''lxdm.conf''' is sometimes required and sometimes not. Set '''lang=''' to inverse value of itself when LXDM potentially enters a boot loop and fails to load target sessions.}} |
The configuration files for LXDM are all located in {{ic|/etc/lxdm}}. The main configuration file is {{ic|lxdm.conf}}, and is well documented in its comments. Another file, {{ic|Xsession}}, is the systemwide x session configuration file and should generally not be edited. The other files in this folder are all bash scripts, which are run when certain events happen in LXDM. | The configuration files for LXDM are all located in {{ic|/etc/lxdm}}. The main configuration file is {{ic|lxdm.conf}}, and is well documented in its comments. Another file, {{ic|Xsession}}, is the systemwide x session configuration file and should generally not be edited. The other files in this folder are all bash scripts, which are run when certain events happen in LXDM. | ||
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{{bc|session<nowiki>=</nowiki>/usr/bin/startlxde}} | {{bc|session<nowiki>=</nowiki>/usr/bin/startlxde}} | ||
− | To whatever session or DE is desired. | + | To whatever session or DE is desired. |
+ | Example using xfce: | ||
{{bc|session<nowiki>=</nowiki>/usr/bin/startxfce4}} | {{bc|session<nowiki>=</nowiki>/usr/bin/startxfce4}} | ||
− | This is useful for themes that have no visible session selection box, | + | This is useful for themes that have no visible session selection box, and if experiencing trouble using autologin. |
==== Per user ==== | ==== Per user ==== | ||
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To log in to one account automatically, without providing a password, find the line in {{ic|/etc/lxdm/lxdm.conf}} that looks like this: | To log in to one account automatically, without providing a password, find the line in {{ic|/etc/lxdm/lxdm.conf}} that looks like this: | ||
#autologin=username | #autologin=username | ||
− | Uncomment it, | + | Uncomment it, substituting the target user instead of "username". |
This will cause LXDM to automatically login to the specified account when it first starts up. However, if one were to log out of that account, one would have to enter its password to log back into it; if the password was empty, that user will be unable to log into the account. To remedy this and be able to log into the account without entering a password, first delete the password: | This will cause LXDM to automatically login to the specified account when it first starts up. However, if one were to log out of that account, one would have to enter its password to log back into it; if the password was empty, that user will be unable to log into the account. To remedy this and be able to log into the account without entering a password, first delete the password: | ||
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{{note|This will kill daemons such as tmux, urxvtd, etc.}} | {{note|This will kill daemons such as tmux, urxvtd, etc.}} | ||
− | + | Users can replace killall command with the following to exclude ssh and screen processes from termination: | |
ps --user $USER | egrep -v "ssh|screen" | cut -b11-15 | xargs -t kill | ps --user $USER | egrep -v "ssh|screen" | cut -b11-15 | xargs -t kill |
Revision as of 18:39, 6 January 2013
zh-CN:LXDM Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary end
Contents
Installation
Install the lxdm package which is available in the official repositories.
Usage
Currently, lxdm provides an lxdm.service file. Enable it like any other systemd service:
# systemctl enable lxdm.service
Configuration
The configuration files for LXDM are all located in /etc/lxdm
. The main configuration file is lxdm.conf
, and is well documented in its comments. Another file, Xsession
, is the systemwide x session configuration file and should generally not be edited. The other files in this folder are all bash scripts, which are run when certain events happen in LXDM.
These are:
-
LoginReady
: Is executed with root privileges when LXDM is ready to show the login window. -
PreLogin
: Is run as root before logging a user in. -
PostLogin
: Is run as the logged-in user right after they have logged in. -
PostLogout
: Is run as the logged-in user right after they have logged out. -
PreReboot
: Is run as root before rebooting with LXDM. -
PreShutdown
: Is run as root before poweroff with LXDM.
Unlocking Keyrings upon Login
When using a key manager such as gnome-keyring to manage passwords for ssh keys, /etc/pam.d/lxdm
should be adjusted to allow users to unlock keyrings upon login if desired. The following is a functional configuration:
#%PAM-1.0 auth requisite pam_nologin.so auth required pam_env.so auth required pam_unix.so auth optional pam_gnome_keyring.so account required pam_unix.so session required pam_limits.so session required pam_unix.so session optional pam_gnome_keyring.so auto_start password required pam_unix.so
Adding Face Icons
A 96x96 px image (jpg or png) can optionally be displayed on a per-user basis replacing the stock icon. Simply copy or symlink the target image to $HOME/.face
.
The gnome-control-center package supplies some default icons suitable for the lxdm screen. Look under /usr/share/pixmaps/faces
after installing that package.
Default session
Globally
Edit /etc/lxdm/lxdm.conf
and change the line:
session=/usr/bin/startlxde
To whatever session or DE is desired.
Example using xfce:
session=/usr/bin/startxfce4
This is useful for themes that have no visible session selection box, and if experiencing trouble using autologin.
Per user
To define an individual user's preferred session, simply edit his/her respective ~/.dmrc
to define the selection.
Example: user1 wants xfce4, user2 wants cinnamon, and user3 wants gnome:
For user1:
[Desktop] Session=xfce
For user2:
[Desktop] Session=cinnamon
For user3:
[Desktop] Session=gnome
Autologin
To log in to one account automatically, without providing a password, find the line in /etc/lxdm/lxdm.conf
that looks like this:
#autologin=username
Uncomment it, substituting the target user instead of "username".
This will cause LXDM to automatically login to the specified account when it first starts up. However, if one were to log out of that account, one would have to enter its password to log back into it; if the password was empty, that user will be unable to log into the account. To remedy this and be able to log into the account without entering a password, first delete the password:
$ passwd -d USERNAME
Then, edit the PAM file for LXDM, which is /etc/pam.d/lxdm
. The files in this directory describe how users are authenticated by the various installed programs that need to do some sort of authentication. Change the line that says
auth required pam_unix.so
to this:
auth required pam_unix.so nullok
This will tell the pam_unix authentication module that blank passwords are to be accepted. After making this change, LXDM will log into accounts with blank passwords.
Expected Logout Behavior
What might be slightly surprising with LXDM is that, by default, it does not clear the last user's desktop background or kill the user's processes when that user logs out. Users desiring this behavior, can edit /etc/lxdm/PostLogout
like this:
#!/bin/sh # Kills all your processes when you log out. killall --user $USER -TERM # Sets the desktop background to solid black. Useful if you have multiple monitors. xsetroot -solid black
Users can replace killall command with the following to exclude ssh and screen processes from termination:
ps --user $USER | egrep -v "ssh|screen" | cut -b11-15 | xargs -t kill
Sessionlist
To add/remove entries to LXDM's session dropdown menu; create/remove the .desktop files in /usr/share/xsessions as desired. A typical .desktop file will look something like:
[Desktop Entry] Encoding=UTF-8 Name=Openbox Comment=Log in using the Openbox window manager (without a session manager) Exec=/usr/bin/openbox-session TryExec=/usr/bin/openbox-session Icon=openbox.png Type=XSession
Simultaneous Users and Switching Users
LXDM allows multiple users to be logged into different ttys at the same time. The following command is used to allow another user to login without logging out the current user:
$ lxdm -c USER_SWITCH
Xscreensaver can also perform this task. For more, see the Xscreensaver#LXDM article.