Installing NDOutil add-on for Nagios sometimes might be a painful process… for most case it’s just permission issue, specially mysql and NDO sock…
most of the time, you might get the following error message:
ndomod: Error writing to data sink! Some output may get lost…
ndomod: Successfully flushed 73 queued items to data sink.
or
ndomod: Could not open data sink! I’ll keep trying, but some output may get lost…
first of all, make sure that you use unix socket in your config file and not TCP.. it’s recommend to use unix socket…