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Chapter 14. Session Management
14.1. What Is GDM?
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The
GNOME Display Manager (GDM) is a graphical login program running in the background that runs and manages the X servers for both local and remote logins.
GDM is a replacement for XDM, the X Display Manager. However, GDM is not derived from XDM and does not contain any original XDM code. In addition, there is no support for a graphical configuration tool in GDM, so editing the /etc/gdm/custom.conf configuration file is necessary to change the GDM settings.
14.1.1. Restarting GDM
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When you make changes to the system configuration such as setting up the login screen banner message, login screen logo, or login screen background, you need to restart
GDM for your changes to take effect.
Warning
Keep in mind that restarting the service forcibly interrupts any currently running GNOME session of any desktop user who is logged in. This can result in users losing unsaved data.
To restart the
GDM service, run the following command:
systemctl restart gdm.service
# systemctl restart gdm.service
For more information about managing services on Red Hat Enterprise Linux 7, see the System Administrator's Guide.
14.1.2. Displaying results of GDM configuration
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To display results of the
GDM configuration, run the following command:
DCONF_PROFILE=gdm gsettings list-recursively org.gnome.login-screen
$ DCONF_PROFILE=gdm gsettings list-recursively org.gnome.login-screen 
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