noip2 is a dynamic update client for No-IP to keep your current IP address synchronized with your No-IP domain, no matter whether the IP is dynamically requested via DHCP or static assigned. Furthermore, with the domain name, we can host site using a "static" domain whose CNAME points to the No-IP domain.
Install the package
# yum install noip
Configure it for the first time
# noip2 -C
It will asks for the account/password information and asks for the domains to sync, just select and input the appropriate information here.
Configure noip to run automatically as a service
# chkconfig noip on
Then you can start it
# service noip start
You can configure it to run as normal users if the IP is get via NetworkManager after user logging in.
After the configuration, try to ping your No-IP domain and it should point to your public IP now.
*/30 * * * * /sbin/service noip restart