It seems to me that running the auto-install script for updating 4.2.0 to 4.2.3 is suboptimal, maybe a distinct script for a minor update would be a better idea.
In my case updating Zenoss was as simple as :
- Stopping Zenoss
- Upgrading rabbitmq-server (new version required)
- Running yum update with the 4.2.3 rpm (much gentle than yum install)
- Starting Zenoss
I did the same thing on the remote collector but it was a little bit trickier because Zenoss update requires MySQL to be up and running even though it is not used at all (I had it stopped in order to spare the system resources).