This is specifically for RHEL5, but it should work similarly on older RHEL and CentOS.
First install the repo:
wget -q -O - http://linux.dell.com/repo/hardware/OMSA_5.5/bootstrap.cgi | bash
Then you may get an error from yum about “–disableplugin”. If so, clean the repos manually:
yum clean all
Then install compat-libstdc++. I found it in on the ISO in the Server directory:
rpm -i compat-libstdc++-33-3.2.3-61.i386.rpm
Now install the Open Manage software:
yum install srvadmin-all
Then start up the services:
srvadmin-services.sh start
Now test the services:
omreport chassis
Simple.