Could write a script that runs on the local machine(s) when called from nagios via snmp This will require that all snmp's are set up alike on all the local machines, and a line formatted similarly below be added to each /etc/snmp/snmpd.conf file: exec check_users /usr/local/bin/check_users.sh <snip> #!/bin/bash ## Title: check_users.sh ## This will check the users logged in and report a crit if there are too many WHO=/usr/bin/who WC=/usr/bin/wc WARN=1 CRIT=3 users=`$WHO` output=`$WHO | $WC -l` if [ "$output" = "1" ] || [ "$output" = "2" ] then RETVAL=1 elif [ "$output" -gt "2" ] then RETVAL=2 fi if [ "$users" = "" ] then users="No users logged in" fi ## Let's output it: echo $users exit $RETVAL </snip> Restart your snmpd Now, from the nagios box cli: /usr/lib/nagios/plugins/check_snmp -H YOUR_HOST_TO_CHECK -C YOUR_SNMP_COMMUNITY_STRING -o enterprises.ucdavis.extTable.extEntry.extResult.NUMBER,enterprises.ucdavis.extTable.extEntry.extOutput.NUMBER -w 0 -c 1 where: NUMBER above is actually the exec command you want to execute in the snmpd.conf file. You can have many "exec" lines, and they are accessed via this number. For example: <snip from snmpd.conf>\ exec check_users /usr/local/bin/check_users.sh exec check_procs /usr/local/bin/check_procs.sh </snip> If those are the only two, then you access check_users.sh by replacing NUMBER with 1 or check_procs.sh by replacing it with 2, and so on . . . . HTH! G.~ <div class="gmail_quote">On Thu, Apr 17, 2008 at 2:06 PM, Jay R. Ashworth <<a href="mailto:jra@baylink.com">jra@baylink.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I've just installed Nagios 3 and begun to configure it for my network (25ish servers, all but 2 running Linux, 250ish workstations, all but about 25 running Ubuntu), and after slogging through "SSL error" on check_nrpe -- which means about 3 different things having nothing to do with SSL -- and the ever popular "audio embeds *aren't* application/wav; they're audio/x-wav, just ask my mime.types file" problems, I'm now up to the possibly uncommon way I want to use check_users... I'm setting check_users (via nrpe) to warn at 1 and CRIT at 3 users -- I'm putting this on servers that, typically, have no humans logged in at all. Since that's true, I'd like to have the list of users from who -q returned as part of the status message. a) Is this a not uncommon usage, and when I patch the program, should I therefore post and or submit a patch to do this? b) How long can that status message become without breaking 1) nagios and 2) nrpe? Anyone have opinions, answers, or pointers? Cheers, -- jra -- Jay R. Ashworth Baylink <a href="mailto:jra@baylink.com">jra@baylink.com</a> Designer The Things I Think RFC 2100 Ashworth & Associates <a href="http://baylink.pitas.com" target="_blank">http://baylink.pitas.com</a> '87 e24 St Petersburg FL USA <a href="http://photo.imageinc.us" target="_blank">http://photo.imageinc.us</a> +1 727 647 1274 Those who cast the vote decide nothing. Those who count the vote decide everything. -- (Joseph Stalin) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. <a href="http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone" target="_blank">http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </blockquote></div> -- Gary Every "Pay it Forward!"