NginX
NginX Starts on Boot Time
Apache and NginX can't run at the same port (80) at the same time. It is needed to stop Apache and start NginX after boot.
Ubuntu 12.04
#update-rc.d apache2 disable
#update-rc.d nginx enable
CentOS 6.5
#chkconfig httpd off
#chkconfig nginx on
#chkconfig