/etc/yum.repos.d/CentOS-Base.repo

[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://ftp.riken.jp/Linux/dag/redhat/el$releasever/en/$basearch/dag

wget http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt
rpm --import RPM-GPG-KEY.dag.txt

yum install munin
yum install munin-node

vi /etc/httpd/conf/httpd.conf
Include /etc/httpd/conf.d/munin.conf

mkdir /var/www/html/munin/
chown munin:munin /var/www/html/munin/
munin-node start
vi munin.conf
    /var/www/munin -> /var/www/html/munin