The F15 installer allows of encrypting the VG at boot time. You seem to understand the concept of what you want to do, you just don’t realize you can do it. During the OS install, select ‘Create Custom Layout’ and on the ‘LVM Physical Volume’ make sure ‘encrypt’ is checked. The installer will ask for the password and take care of all the setup.
-- Jess Males
I'm pushing my way up to this list as my question has languished in other forums...
Upgrading F11 to F15 I've decided to take advantage of disk encryption for my laptop. My experience with Anaconda finds limited support for custom disk partitions (mine is dual boot). The result of my second install attempt was a PV boot and LVM Volume Group with home, root, and swap. The problem is these three Logical Volumes were made each with their own encryption! Fedora documentation only gives instructions for setting encrypting during Anaconda as whole disk install or [after the system is installed](http://docs.fedoraproject.org/en-US/Fedora/15/html/Installation_Guide/apcs04.html).
What I am not clear on is the step to create the LVs. Reading cryptsetup docs and the above examples I conclude LuksOpen and LuksClose commands "bookend" the LVM linux commands pvcreate, vgcreate, and lvcreate. Then I won't use gparted at all?