NTP and VMware Linux Guests

After a few months of running RHEL guests on VMWare, we came to the realization that they just don’t maintain their clocks very well.  A little research showed that this is a commong problem in VMWare.  It sounds like it’s attributed to the fact that the machines don’t have access to the “entire” processor … I’m not really sure how that works, but I’ll believe it until someone tells me otherwise.

 Regardless, NTP is necessary in this situation because we’ve got apps that rely on accurate time running on that server.  Enter VMware tools.

By mounting the VMWare tools CD .. (it’s not a real CD, just software in the mgmt suite), and installing it, we can synch the VMWare Guest OS to the ESX host that it’s running on.  (The ESX hosts are also automatically running NTP that synchs to VMWare’s own time-server cluster).

 After mounting the CD, I ran: 

vmware-config-tools.pl

This runs thru a real basic config script that configures the software.  After that, I ran:

vmware-toolbox &

This actually launches the the management tool in XWindows for configuration.  In there, I just clicked the “Synch NTP with ESX Host.” button and my problem was solved.




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