www.deployingradius.com
 
 
or
 
yum install freeradius
vi /etc/raddb/*
 
 
or
 
wget ftp://ftp.freeradius.org:/pub/radius/freeradius-1.1.6.tar.bz2
tar -xjvf freeradius-1.1.6.tar.bz2
cd freeradius-1.1.6
./configure
make
make install
vi /etc/raddb/*
 
seriously, your question is just SO open.
 
alan