Nagios Support Forum

Are you sure there is no security on this smtp relay?

Yes there is, but we have opened it up for the IP address of the nagios server to allow emails to go through.

I now have email up and running. Now I cannot delete servers from nagios.

When you say delete servers from Nagios, do you mean hosts? Or do you have a distributed setup and you want to decommission one of your monitoring servers?

And out of curiosity, what was the issue with the emails?

Yes, how do I delete one of the host/servers that I setup to monitor. When I click on delete, it says there is a dependent relationship. This is the error we get:

Object ID: 3 of table tbl_host:
Relation to Services, entry: smartfilter.bcps.k12.md.us-Ping - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-CPU Usage - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-Memory Usage - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-Uptime - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-Drive C: Disk Usage - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-Drive D: Disk Usage - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-SepMasterService - Dependent relationship
Relation to Services, entry: smartfilter.bcps.k12.md.us-NSClientpp - Dependent relationship
Object still has dependent relationships! Item was not deleted.

Ahh, I can't tell you how many times in a week I get that same message :D

In order to delete a host you must first delete all the services related to it. The 8 service checks listed can be mass-deleted by searching for "smartfilter.bcps.k12.md.us-" in the Services window, and then checking each box. At the bottom you will see a drop-down that allows you to delete all selected. Then you can delete the host.

Thank you sooo very much! You do not understand how frustrating it was to look for it.

One more question, we would like to dive deep into using this for VMware monitoring. I see that you can monitor hosts and guest vms. Is there a document that explains how to do this? Basically how do you install the NSC client on a host if it is in linux?

Do you mean for monitoring the overall health of a VM host (average cpu load across guests, average memory across guests, etc) or for monitoring individual guests? If you want to monitor a specific guest you can just set up a check as if it were a physical machine. Active and passive checks work the same. If you want to monitor a linux guest VM's CPU usage or other internal metrics, you will need to look into NRPE:

http://exchange.nagios.org/directory/Ad ... or/details

I meant monitoring services on the host server that a guest vm sits on. How do I install this on a linux machine?
Thank you.

Same deal, install the NRPE client daemon and configure as per the link I provided.