May 6, 2013

Redhat Enterprise Linux patching: Rollback strategies

Posted in Linux at 10:25 am by alessiodini

Soon i will patch a lot of systems ( RHEL 5 – RHEL 6 ) and i’m planning every rollback strategy.
Studying and looking for the web I found that people usually use RPM rollback but this is NOT RECOMMENDED!!

People on RHEL 5 add RPM macro , on RHEL 6 use yum history but both struments can be used for small rollbacks, not for minor release rollbacks!

I read this from Redhat:

Note: Downgrading a system to minor version (ex: RHEL-6.1 to RHEL-6.0) is not recommended as this might leave the system in broken state where libgcc and other libraries won’t rollback as expected. Use the history option for small update rollbacks.

Same is for RHEL 5.

So what can I think about rollback?

1) LVM snapshot ( usually estimated as ~ 20% lvol source space, only on RHEL 6 )
2) Files copy from / and /boot partitions with dd. This is useful with soft/hard links and it’s bit a bit copy. I just need a filesystem from SAN or NFS. If snapshot will not work I just need to boot the system in rescue mode , configure the network , mount the filesystems and use dd for rollback!
3) Disk from RAID HARDWARE
4) Dedicated software backup ( Networker Legato for example )



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