I have going to setup a linux server cluster for http load balancing.
Since all backend servers having the same hardware and software configuration, I'm looking for any linux live cd such that just put the cd in the cdrom and boot it up. That's all.........GREAT!!!!!

But I searching on the web, all live cd is for desktop purpose so for example x window , multimedia applications are not needed.

So I'm looking for how to make my own linux live cd ?

for example I want to use redhat Advanced server 3 as the core to build the image

I don't know if it'd help since it's based on Debian, but the Knoppix-off-shoot projects, such as ClusterKnoppix or Morphix would help. Morphix is based on Knoppix but it has extracted the various major components into a modules form, so you don't necessarily have to load KDE (or Gnome) if you don't want.

Just out of curiosity, if you're seting up servers, why are you looking for a LiveCD? Surely an actually installed system would be more beneficial? LiveCDs take a huge chunk out of your RAM. Even if you've got shed-loads of RAM available, wouldn't it make more sense to have an proper harddrive installed system? If you're concerned about security, you can mount a lot of filesystems as RO and only have that which needs to be RW mounted as such.

The way I would do this is setup a single base system then use PartImage (using Knoppix) to create an image of the partition. Use the restore option to put each os on the required number of drives. Have done this many times for a friend that buys old laptops by the crate.

I just thought... Knoppix (and probably the offshoots) has the ability to run a shell script from a floppy disk. I've not looked at whether it expects certain things, or when during the boot-up process it runs the script, but I would hazard a guess that this would be the perfect place to make it an automated image restorer.. without having to make your own LiveCD. If it runs after the main boot process, then so long as you make sure it boots to runlevel 2, I can see no reason why you can't have a fully automated setup where it can even download a PartImage file over a network and then restore it.

Check out the Knoppix Cheatcodes.