We all knows CentOS 5 does not come with a repository that holds valid redhat style rpm’s for rrdtool. So here is how we fix that.
We create a file named dag.repo in /etc/yum.repos.d/dag.repo with following code:
[dag] name=Dag RPM Repository for Red Hat Enterprise Linux baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag gpgcheck=1 gpgkey=http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt enabled=1
Now,run
[root@localhosts]# yum install rrdtool