Again, it is not necessary to reboot the ESX host after updating /etc/localtime .Reference the zoneinfo file used in step 2 and compare it to etc/localtime using the diff command: Upon booting, ESX runs /etc/rc.d/init.d , which reads /etc/sysconfig/clock to set the system clock based on the hardware clock's current time and the configured time zone information.When you are prompted to reboot at the end of the upgrade, the installer will restart your system to run ESX Server.The correct time is essential to your ESXi server, you will need it for a variety of reasons (syslog, iscsi authentication and Security) and your Virtual Clients. The Knowledgebase is a searchable database of technical questions and answers to troubleshoot a variety of issues.Compiled by the Barracuda Technical Support team, this interactive tool is designed to be an easy way to solve technical issues.The time sync was turned on in VMWare Tools on the guest, but the guest clocks were consistently off (by about 30 seconds) from the host clock.The ESXi host was configured to get time updates from an internal time server.
Click on the General tab and set the startup Policy to Start automatically 8.
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It turns out we had the Internet Time setting turned on in the Windows VM's (Control Panel Internet Time tab) so the guest was getting time updates from two places and the internet time was winning.
We turned that off and now the guest clocks are good, getting their time exclusively from the ESXi host.