Use ddclient to update dyndns automatically on CentOS

vi /etc/ddclient/ddclient.conf
some parameters have to be uncommented and set


use=web # via web
login= # default login
password= # default password

##
## dyndns.org dynamic addresses
##
## (supports variables: wildcard,mx,backupmx)
##
server=members.dyndns.org, \
protocol=dyndns2 \
yours.dyndns.org

/etc/rc.d/init.d/ddclient {start|stop|restart|status}