VxRail: How to flush vCenter and VxRail DNS cache

Summary: How to flush vCenter Domain Name System(DNS) cache.

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Instructions

The Domain Name System (DNS) server entries must be updated during a change of ESXi hostname or Management IP address. Those host name-IP mappings are cached by DNS cache service in the vCenter server. To avoid using the wrong hostname-IP mapping, the DNS cache proxy service must be restarted at the right time.

After changing the ESXi hostname, the DNS cache service must be restarted after the hostname changing process is done.
After changing the ESXi management IP address case, the DNS cache service must be restarted immediately after updating the DNS server and before continuing the process.

 

The steps are the same for vCenter and VxRail manager.

How to flush DNS cache:

  1. Log in to the vCenter server using account root. For VxRail Manager, log in using the mystic user and elevate to root.
  2. Run the command  
    service dnsmasq restart
  3. To verify the name-IP mapping is correct run 
    dig @localhost <hostname>

Additional Information

Important note: Due to a code issue, VxRail 7.0.480 UI may incorrectly present this KB when user trying to perform a sequential host reboot. If you have reached this KB article via sequential host reboot UI page, check the correct KB article KB 000216816

Affected Products

VxRail, VxRail Appliance Series, VxRail Software
Article Properties
Article Number: 000022931
Article Type: How To
Last Modified: 31 Mar 2026
Version:  8
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