So we use check_mk pretty extensively for all of our servers for health monitoring. Today we added a brand new bare metal centos 7 minimal install on-sit test server to nagios.
We were getting this strange service when we added the box to be invetnoried:
CRITICAL 06-29-2015 13:43:49 3d 5h 14m 51s 3/3 CRIT - mathias-kettner.de could not be resolved
I couldn’t figure out what this check does so I took a peak at the git repo, and saw that its doing a nslooup. Well my box didn’t have nslookup installed, so a quick
sudo yum install bind-utils -y
seem to do the trick!