Just follow this:http://www.haiyun.me/archives/centos-freeradius-daloradius-ros.html, and I will list something different in CentOS7

#1:CentOS7 replaces mysql with mariaDB, try this

yum install mariadb-server mariadb

or if you insist on installing mysql, follow this:http://www.server180.com/2014/09/how-to-install-mysql-on-centos-7-step.html

#2:As mariaDB is a drop-in replacement for MySQL, we use follow commands:

mysqladminmysql

#3:In CentOS7, try these commands to install freeradius

//To see what is able to installyum list|grep freeradius//I use these commands to intall ityum install freeradius freeradius-mysql freeradius-utils

 #4:Try these to start service:

service httpd startservice mysql startservice radiusd start

Try to config LAMP+Freeradius+daloRADIUS on CentOS7