[root@localhost ~] # mkdir /root/download/rrdtool
[root@localhost ~] # cd /root/download/rrdtool

[root@localhost rrdtool] # wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm
[root@localhost rrdtool] # rpm -Uvh rpmforge-release-0.5.2-2.el5.rf.i386.rpm
[root@localhost rrdtool] # rm -f rpmforge-release-0.5.2-2.el5.rf.i386.rpm
[root@localhost rrdtool] # yum -y install rrdtool perl-rrdtool

출저 :
http://xsuntel.blogspot.kr/2010/10/nms-centos-55-rrdtool-install.html