Troubleshooting if hosts vanish during a vCenter update

Owned by Robin Gierse
Last updated: Dec 11, 2023 by Matthew Hierholzer

This article explains why hosts may vanish after a vCenter update.

LAST TESTED ON CHECKMK 2.0.0P1

Table of Contents

Problem

When updating a vCenter, hosts that DCD added vanish.

Reason

The piggyback data from the vCenter does not get updated, so the DCD will delete the hosts that do not receive any data after the configured amount of time.

Solution

To mitigate this issue, you can disable the DCD connection for the vCenter before the update and re-enable it afterward.

The following side effects have been observed at the time of writing:

  • Affected hosts lose their agent update registration.