Werk #12903: Management boards: cache DNS lookup

Component Core & Setup
Title Management boards: cache DNS lookup
Date Jul 1, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1 2.0.0p7
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

If the management board address of a host has been provided as a name (not an IP address) Checkmks DNS lookup cache has not been effective.

While this was consistent with the behaviour of the IP address configuration of the hosts (as documented here: https://docs.checkmk.com/latest/en/wato_hosts.html#dns), it lead to a lot of DNS lookups.

The management board address is now treated analogous to the host name: If it is a name (not an IP address), it will be resolved during "activate changes", reducing the number of required DNS lookups.

In the rare case your management board has a dynamic IP address, you must configure the entire host to use dynamic lookup using the WATO rule "Hosts with dynamic DNS lookup".

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