check_by_ssh help

[Waynn Lue]

I'm trying to set up check_by_ssh to run a php script on a remote machine
that acts as a Nagios plugin.  The script runs a few ls commands to figure
out the number of directories in a subdirectories, then gives output and
return codes accordingly (if it's past a certain threshold, I wantit to
error).  I've setup an SSH key so that I can ssh into the machine to run the
ls command.

host1 has the nagios install, so it's where I run check_by_ssh from.  host2
is where the php script is installed.

Here's the command_line definition in the command definition
/usr/local/nagios/libexec/check_by_ssh -H host2 -l user -C "$ARG1$"'

Here's the check_command in the service definition
check_by_ssh_host2!/usr/local/bin/php /root/scripts/php_script.php

I changed the php script to just do

echo "DIRS CRITICAL\n";
return 2;

But all I get is "(null)" in the email sent from nagios, which implies to me
that it's not even running the script.  When I run the libexec/check_by_ssh
line from the command line, it correctly works.  How can I debug why it
isn't working within the Nagios framework?

As a gut check, how do I check what $USER the script is running as?  I'm
assuming "nagios" currently, which is how I've set up the SSH keys.

Thanks for any help!

Waynn
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