cluster
 

how to build cluster on ubuntu server 12
thanks

1. Go to http://www.google.com
2. Put "ubuntu server 12 cluster howto" into the box
3. Press ENTER
4. Read results

You will see things like this:
https://help.ubuntu.com/12.04/serverguide/uec.html

Since you don't say what KIND of cluster (MPP system? Apache? Database? Storage?), it's impossible to give advice. Instead of posting a vague question, you need to do some research on your own, and post a specific question if you get stuck.