vCenter Virtual Appliance Network Settings Reverting

In one of my lab environments my vCenter Server Appliance (VCVA VCSA*) kept reverting its DNS server settings after I changed them in the VCSA web interface (https://:5480).  After changing the Preferred DNS Server and Alternate DNS Server settings to use my Active Directory Domain Controller IPs and then rebooting the appliance, the DNS settings were removed and the Preferred DNS Server setting was reverted to the setting present before I updated it. Losing my DNS Server settings caused me all sorts of issues - my vCenter Server couldn't find ESXi hosts by name, AD authentication failed, … [Read more...]

PowerCLI Script to Set DNS and NTP on ESXi Hosts

Since joining VMware, I've built, rebuilt and updated several lab environments (home lab and work labs).  One of the problems I keep running into is incorrect/missing/disabled NTP on my ESXi hosts.  Because lab gear is often abused well-loved, BIOS time is not always correct (long periods of being powered off), settings are all sorts of jacked up (it's a lab, we're engineers, let's break stuff!!!), and documentation is non-existent.  The problem is not just in a lab environment - the number of customer environments I've seen that aren't set to use NTP is much higher than I would have thought … [Read more...]

vSphere Upgrade Breaks Active Directory

I recently completed a VMware VI 3.5 to vSphere upgrade in a small environment (5 hosts, 80 VM's).  Being a small environment, the upgrade was planned for one big overnight blitz.  Unfortunately, the size of the environment did not afford a test environment to uncover potential issues before the upgrade.  The upgrade to vSphere itself went swimmingly (the vCenter server had been upgraded a couple weeks earlier).  However, some things in the environment started to go wonky once the upgrade was complete.  Specifically, name resolution (DNS), DHCP, WINS, Group Policy, and really anything … [Read more...]