Hello, Yeah, i started to look through my explanation and seems i didn't explained it good enough while misunderstanding few things myself :) So thanks for pointing it out. I have one sever with address 192.168.0.5 that runs linux, has installed munin-node and i want to monitor its load. Munin-node has the load plugin. Then i have another server with the ip 192.168.0.1 that has installed both Nagios and Munin Server. Now instead of checking the Munin server for graphs, i want Nagios to trigger a plugin that checks the load on the machine. I even changed few things in config to test, but no luck. So Nagios has in command.cfg the following def: define command{ command_name check_remote_load command_line /usr/local/nagios/libexec/<a href="http://check_munin.pl">check_munin.pl</a> -H $HOSTADDRESS$ -M $ARG1$ -w $ARG2$ -c $ARG3$ } And i have specified the following host with the service: define host { use linux-server host_name Remote_Server address 192.168.0.5 alias RS contacts admin } define service { use generic-service hostgroup_name linux-servers service_description load check_command check_remote_load!load!8!10! servicegroups +load first_notification_delay 10 contact_groups } Munin-node.conf on 192.168.0.5 has the "allow ^192\.168\.0\.1$" And munin.congf on 192.168.0.1 has the following entry: [application;Remote_Server] address 192.168.0.5 use_node_name yes So as i understand nagios should be triggering the <a href="http://check_munin.pl">check_munin.pl</a> script towards the host Remote_Server. Munin node there should return the load parameters and nagios will return warning on 8 and critical on 10. Please correct me if i got something wrong :) Best wishes, Tõnis <div class="gmail_quote">2011/6/8 Andreas Ericsson <<a href="mailto:ae@op5.se" target="_blank">ae@op5.se</a>> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div><div></div><div>On 06/08/2011 03:27 PM, Tõnis Trei wrote: > Hello, > > I have run into a small problem when tried to set up Nagios on a new system > from scratch and can't figure out whats wrong. Everything looks to be kinda > ok but maybe im overseeing something :) > > Nagios is returning NULL when checking load on a remote machine. > > I defined service: > define service { > use generic-service > hostgroup_name linux-servers > service_description load > check_command > check_remote_load!$_HOSTLOADWARNING$!$_HOSTLOADCRITICAL$ > servicegroups +load > first_notification_delay 10 > contact_groups > } > > and i defined a command in command.cfg > define command{ > command_name check_remote_load > command_line $USER1$/<a href="http://check_munin.pl" target="_blank">check_munin.pl</a> -H $HOSTADDRESS$ -M load -w > $ARG1$ -c $ARG2$ > } > > Check_munin.pl is added on a remote machine. > Munin is installed on the same machine as Nagios and the IP is in ALLOW list > on munin remote node. > Also munin.conf contains the entry for the remote host. > > But for some reason i still get back null when forcing nagios to check the > load. > > Any thoughts on what wrong or how to debug this? :) > </div></div>Nagios doesn't automagically run some commands from the remote node. By your explanation, the <a href="http://check_munin.pl" target="_blank">check_munin.pl</a> script is installed on the remote server and munin is installed on the nagios server. You've either explained the situation extremely poorly or completely misunderstood how networking machines are allowed to talk to each other in the unix world. Either way, you need to rethink your mail, read it out loud a few times and then fix what's broken with the mail or your thinking. If that doesn't cause the bulb to go on in your head, I suggest you get back here with more details about the setup. Use hostnames for the nagios server and the server you're monitoring and explain what's installed where when you mail again; Even if they're fake names, they'll at least give us something to identify the different nodes by so we can be sure what's done where. -- Andreas Ericsson <a href="mailto:andreas.ericsson@op5.se" target="_blank">andreas.ericsson@op5.se</a> OP5 AB <a href="http://www.op5.se" target="_blank">www.op5.se</a> Tel: +46 8-230225 Fax: +46 8-230231 Considering the successes of the wars on alcohol, poverty, drugs and terror, I think we should give some serious thought to declaring war on peace. </blockquote></div>