nate wrote: > ankush grover wrote: > > >> Earlier this server was syncing time through ntp daemon and below is >> the ntp.conf file. Now I have set a cronjob which sync the time with >> > > Best not to run NTP inside a ESX VM. I've never gotten NTP to sync > inside of VMware outside of a kernel with VMI enabled (no versions > of RHEL support VMI at this time as far as I know). > > What I do for my ~40 ESX/ESXi hosts: > - Have your ESX hosts sync to a good NTP server > - Make sure vmware tools is installed and running correctly > (/etc/init.d/vmware-tools status) > - Enable time sync for your guest, either via the UI or via > this command in the guest(I have this command run in cron > every 5 minutes as I have seen for some reason time sync turn > itself off: > /usr/sbin/vmware-guestd --cmd "vmx.set_option synctime 0 1" > - On top of all of that I have another cron set to run ntpdate > every 5 minutes against a local NTP server: > /usr/sbin/ntpdate `cat /etc/ntp/step-tickers | grep -v \#` > > For providing NTP services themselves, currently I run 3 VMs > at each site with Fedora 8 with VMI enabled for the guest VM > (the kernel in FC8 supports VMI, I suspect newer Fedoras work > fine too I just have no reason to change right now). And I have > these FC8 VMs sync to internet hosts(mainly time.nist.gov) so > my internal ESX and other systems can sync against them(they > are load balanced behind a F5 BigIP). > > from FC8 kernel log: > VMI: Found VMware, Inc. Hypervisor OPROM, API version 3.0, ROM version 1.0 > vmi: registering clock event vmi-timer. mult=9483317 shift=22 > Booting paravirtualized kernel on vmi > vmi: registering clock source khz=2260999 > Time: vmi-timer clocksource has been installed. > > I currently run roughly 400 VMs this way and don't have any > noticeable time-related issues. > > nate > > _______________________________________________ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > The OP should also reference this document http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427
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