Cannot lookup IP address | how to deal with it

General
1

In our Checkmk changes menu there are many “Cannot lookup IP address” warnings for different sites. The output for each site is cut and the last line says (e.g.) " * check_mk: 20 further warnings have been omitted".

Since I cannot find a service with that specific output in Checkmk, is there a way of managing such warnings in a tidy way? Like viewing/exporting a list of all hosts with such problems?
Or is this output anyhow configurable (e.g. show more columns) ?

2

Hi,

you can do a cmk -O/cmk -R as the site user and get a list of all the warnings.

Cheers Jeronimo

3

Hi,

this message is related to the DNS lookup of the monitored hosts.
These hosts should all be shown as “Down”, so if you fix all your down host, your problem should be solved.

4

Thanks @jwiederh for the reply. Is this documented somewhere in docs.checkmk.com?

@aeckstein We’re migrating to Checkmk in a big-size data center, where there are many hosts that are down for the most diverse reasons. It would be very useful to isolate the issues.
But if there is no such solution builtin, omd -O will have to do it :slight_smile: