Werk #12903: Management boards: cache DNS lookup
| Component | Core & setup |
| Title | Management boards: cache DNS lookup |
| Date | Jul 1, 2021 |
| Checkmk Edition | Checkmk Raw (CRE) |
| Checkmk Version | 2.0.0p7 2.1.0b1 |
| 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".
