HI Ralph, The point of running the following command on the nagios server: "sudo -u nagios /usr/local/lib/nagios/linexec/check_nrpe -H remote.host -t 30 -c check_custom_plugin" Was to make sure Nagios can run nrpe and retrieve the plugins output from the remote cluster node. When I run that command, I get a single line of text printed to stout and when I check the return value with "echo $?" I get the correct return value. So I guess the problem is not with nrpe (client or server) but something on the Nagios server side. As I can get results on the command line, but the nagios status grid on the webpage still shows "(No output!)". JB <div>On 17/01/2008, <a href="mailto:Ralph.Grothe@itdz-berlin.de">Ralph.Grothe@itdz-berlin.de</a> <<a href="mailto:Ralph.Grothe@itdz-berlin.de"> Ralph.Grothe@itdz-berlin.de</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi James, I am not sure if my constraints are comparable to yours, but here's the method how I get around having nrpe run commands that require elevated privileges. Though in this simple case it would have been easy to just make the /var/log/messages world readable on this nrpe node I didn't want to interfere with the policies of the owners/admins of this host. So I created a simple sudo rule that allows user nagios to execute the command that I defined in nrpe.cfg to parse the messages syslog file for entries from the kernel. The nrpe daemon is spawned by xinetd and runs under nagios' uid. $ grep user /etc/xinetd.d/nrpe user = nagios The sudo rule for nagios allows him to run the check_log2.pl script (in contrib subdir of standard Nagios-Plugins) under euid of root. $ sudo -l User nagios may run the following commands on this host: (root) NOPASSWD: /usr/lib64/nagios/plugins/contrib/check_log2.pl And this is how the nrpe command is defined $ grep check_syslog /etc/nagios/nrpe.cfg command[check_syslog_VMUNIX]=/usr/bin/sudo /usr/lib64/nagios/plugins/contrib/check_log2.pl -l /var/log/messages -s /tmp/messages.log_seek_kernel.txt -p kernel This would be called from the Nagios server as usual as $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ with $ARG1$ being "check_syslog_VMUNIX" in my case and passed in within the respective service definition. HTH -----Original Message----- From: <a href="mailto:nagiosplug-help-bounces@lists.sourceforge.net">nagiosplug-help-bounces@lists.sourceforge.net</a> [mailto:<a href="mailto:nagiosplug-help-bounces@lists.sourceforge.net"> nagiosplug-help-bounces@lists.sourceforge.net</a>]On Behalf Of James Bewley Sent: Wednesday, January 16, 2008 5:44 PM To: <a href="mailto:nagiosplug-help@lists.sourceforge.net">nagiosplug-help@lists.sourceforge.net </a> Subject: [Nagiosplug-help] NRPE returns correct data,while Nagios shows "No Output" Hi all, I've written some custom plugins that monitor some software around a cluster. I can run them on the individual cluster nodes with "sudo -u /usr/local/nagios/libexec/plugin.pl" and i get a single line printed to stdout and the correct return value. All looks good? So then I run the nrpe client on the nagios server to retrieve the values returned from the plugin like so: "sudo -u nagios /usr/local/nagios/libexec/check_nrpe -H cluster_node -t 30 -c check_remote_plugin" Which also prints the expected string and return value ( which is something like "plugin:OK blahh text \n") and returns the correct value ( 0 in this OK state). So far so good? But when I go to the nagios servers web page (status grid) I get WARNING "(No output!)" I've been scratching my head about this for a while now, can anyone over a solution?? James james at avbrief dot com </blockquote></div>