Duplication of a RHEL5/CentOS5/OEL5 rpm packages between hosts with two commands.

I had to do a hardware refresh this weekend and needed to match the binaries from the original host to the new target host version for version and found that the following two lines of CLI did 90% of the work for me. It was to good not to share. This was tested going from a default 5.8 install to a 5.10 install with the full Oracle DB dependencies stack. Preqrequitsts would be that both the source and target host use the same RPM repos. The only clean up step besides restarting was verifying the right kernel was selected as default in /etc/grub.conf

Produced a formatted list of installed RPMs of Source System

rpm -qa --qf="%{NAME}-%{VERSION}-%{RELEASE}.%{ARCH}\n" |sort >> /root/source_hosts_installed_rpms.txt 

Transfer the file from the Source System to the Target System

scp /root/source_hosts_installed_rpms.txt root@target:/root 

Install List of RPMS from File on Target System

yum -y install $(cat /root/source_hosts_installed_rpms.txt) 

Transaction Summary

Install 54 Package(s) Upgrade 257 Package(s) Total download size: 647 M