I know this question has been asked a lot but I've had no luck with the results I've found. I've set up my first CentOS 7 system and haven't been entirely happy with Gnome 3. I decided to give KDE a try but cannot figure out out to make this my new default desktop. I've got the required components installed but from there I've had no luck. I've found posts on this topic suggesting to create the entries:

DESKTOP="KDE"
DISPLAYMANAGER="KDE"

in /etc/sysconfig/desktop but after doing this and rebooting I still get Gnome when I login. I've also seen suggestions to set the second of these lines to

DISPLAYMANAGER="KDM"

but this doesn't work either. Another suggested solution is to run the commands

echo "exec startkde" >> ~/.xinitrc
startx

and this does sort of work, but it's not a permanent solution. I don't want to have to run this each time I boot my machine. I want KDE by default when I login.

Surely there must be a way to accomplish this in CentOS 7.

Have you tried switchdesk?

I did look for this but it seems to not be available in CentOS 7. At least "yum search" couldn't find it. I solved the issue using a rather big hammer--I uninstalled Gnome 3 and am switching to KDE. I didn't mind Gnome 2 but Gnome 3 is a nightmare...