Welcome to the CentOS fora. Please see the recommended reading for new users linked in my signature.
Please do not dual-post. Your duplicate topic
has been locked.
Nobody should be running anything on the extremely obsolete and thus unsupported CentOS-5.2. The current release is 5.8.
It might help if you provided a link to the information you found. I do see the Oracle provides Linux Server support for Sunray, as determined by a google on solaris sunray client linux OR centos OR RHEL OR "enterprise linux"
. See for instance Sun Ray Server Software
. If there are CentOS/EL-5 packages I can't find them. A better targeted search might be solaris sunray centos OR RHEL OR "enterprise linux"