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How do I install CentOS 5 via a NetInstall iso?

Instead of downloading huge CD or DVD images, consider just using the small CentOS netinstall iso image to install over the internet!

First, download the small CentOS-[version-arch]-netinstall.iso from an available mirror:

http://www.centos.org/mirrors/

For this example, I used the 64bit netinstall disc named:
CentOS-5.5-x86_64-netinstall.iso

Next, boot the CD like any Linux install CD. You will then get to a screen to configure network:

Then choose HTTP:

In this example, I used an NC State mirror. Here are the example values used taken from the url http://ftp.linux.ncsu.edu/pub/CentOS/5.5/os/x86_64/

Web site Name: ftp.linux.ncsu.edu

CentOS Directory: /pub/CentOS/5.5/os/x86_64

For Web site name, remove the http:// from your particular http mirror choice.
For CentOS Directory, use the particular /CentOS/version/os/arch directory available on your mirror choice.

Sit back, and let the install continue! Remember it might take awhile depending on your internet download speed.