UbuntuHelp:UbuntuLTSP/GnomeOptimize
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This page is dedicated to optimizing the Gnome environment for thin-client usage. There are some neat tweaks that we can perform to make Gnome much more suitable for a multi-user environment, and we will explain some things below.
- First off, you'll probably want to Install|the gnome-watchdog package to perform clean-up of user sessions after logout (as some applications and processes do not cleanly exit in an LTSP environment).
Using GConf to secure Gnome
GConf is Gnome's configuration subsystem. It acts as a central configuration repository for many Gnome-based applications, their settings, and the overall Gnome experience. It includes security and lockdown mechanisms, and is pretty extensive. Here's the information I've found so far on GConf that is relevant to LTSP:
LOCKDOWN
Set these keys as MANDATORY for it to be effective
- /apps/panel/global: locked_down
- /apps/metacity/global_keybindings: Go here to disable/set keybindings (such as removing the default ALT+F2 = run dialogue so students cannot arbitrarily run any program on the system)
- /apps/gnome_settings_daemon/screensaver: start_screensaver
- /desktop/gnome/background: picture_filename /home/share/backgrounds/picture.jpg
- /desktop/gnome/lockdown: disable_lock_screen
- /desktop/gnome/lockdown: disable_user_switching
Niceties
Use these gconf keys to clean up the user interface and provide some nice features for multi-user sessions
- /apps/panel/global/disabled_applets: A list of applets you can disable. This was relevant when removing fast-user-switch and deskbar applets, as Gnome would complain upon login of every user that it couldn't load the applet (they are defaulted to load even when the packages are removed) (see image here)
- /apps/panel/toplevels/*/background: Will be good for setting panel translucency/color for administrator accounts
- /desktop/gnome/interface/enable_animations: Will enable/disable animations in various aspects of Gnome, which can be sludgy in LTSP environments
NOTE: If you are not familiar with GConf, please read up on it via the links below to understand how it works and how to set mandatory keys, as this is important if you want to lock down settings for all users.
