How to debug a check_http problem?

[Sean McAfee]

Götz Reinicke wrote:
> Hi,
>
> recently I noticed, that checking some virtual http services fails.
>
> If I launch the check_http command by hand, I do get a "HTTP OK" message.
>
> If the check is launched by nagios, it fails with an "HTTP WARNING:
> HTTP/1.1 404 Not Found" message.
>   
In situations like this, the problem is usually either permissions or a 
misconfiguration in templates/check_commands so the first step is always 
to enable debugging.  This will allow you to get the actual 
macro-expanded command that Nagios is trying to execute:

[1223999444.193398] [2048.1] [pid=44166] **** BEGIN MACRO PROCESSING 
***********
[1223999444.193410] [2048.1] [pid=44166] Processing: 
'$USER1$/check_nrpe2 -H $HOSTADDRESS$ -c check_nagios_status -a "$ARG1$"'
[1223999444.193424] [2048.2] [pid=44166]   Processing part: ''
[1223999444.193437] [2048.2] [pid=44166]   Not currently in macro.  
Running output (0): ''
[1223999444.193450] [2048.2] [pid=44166]   Processing part: 'USER1'
[1223999444.193473] [2048.2] [pid=44166]   Processed 'USER1', Clean 
Options: 0, Free: 0
[1223999444.193486] [2048.2] [pid=44166]   Processed 'USER1', Clean 
Options: 0, Free: 0
[1223999444.193504] [2048.2] [pid=44166]   Cleaning options: global=0, 
local=0, effective=0
[1223999444.193519] [2048.2] [pid=44166]   Uncleaned macro.  Running 
output (25): '/usr/local/libexec/nagios'
[1223999444.193532] [2048.2] [pid=44166]   Just finished macro.  Running 
output (25): '/usr/local/libexec/nagios'
[1223999444.193545] [2048.2] [pid=44166]   Processing part: 
'/check_nrpe2 -H '
[1223999444.193559] [2048.2] [pid=44166]   Not currently in macro.  
Running output (41): '/usr/local/libexec/nagios/check_nrpe2 -H '
[1223999444.193571] [2048.2] [pid=44166]   Processing part: 'HOSTADDRESS'
[1223999444.193585] [2048.2] [pid=44166]   macro_x[2] (HOSTADDRESS) match.
[1223999444.193601] [2048.2] [pid=44166]   Processed 'HOSTADDRESS', 
Clean Options: 0, Free: 1
[1223999444.193614] [2048.2] [pid=44166]   Processed 'HOSTADDRESS', 
Clean Options: 0, Free: 1
[1223999444.193627] [2048.2] [pid=44166]   Cleaning options: global=0, 
local=0, effective=0
[1223999444.193642] [2048.2] [pid=44166]   Uncleaned macro.  Running 
output (97): '/usr/local/libexec/nagios/check_nrpe2 -H foo.domain.com'
[1223999444.193655] [2048.2] [pid=44166]   Just finished macro.  Running 
output (97): '/usr/local/libexec/nagios/check_nrpe2 -H foo.domain.com'
[1223999444.193668] [2048.2] [pid=44166]   Processing part: ' -c 
check_nagios_status -a "'
[1223999444.193681] [2048.2] [pid=44166]   Not currently in macro.  
Running output (125): '/usr/local/libexec/nagios/check_nrpe2 -H 
foo.domain.com -c check_nagios_status -a "'
[1223999444.193778] [2048.2] [pid=44166]   Processing part: 'ARG1'
[1223999444.193795] [2048.2] [pid=44166]   Processed 'ARG1', Clean 
Options: 0, Free: 0
[1223999444.193808] [2048.2] [pid=44166]   Processed 'ARG1', Clean 
Options: 0, Free: 0
[1223999444.193821] [2048.2] [pid=44166]   Cleaning options: global=0, 
local=0, effective=0
[1223999444.193834] [2048.2] [pid=44166]   Uncleaned macro.  Running 
output (126): '/usr/local/libexec/nagios/check_nrpe2 -H foo.domain.com 
-c check_nagios_status -a "2'
[1223999444.193848] [2048.2] [pid=44166]   Just finished macro.  Running 
output (126): '/usr/local/libexec/nagios/check_nrpe2 -H foo.domain.com 
-c check_nagios_status -a "2'
[1223999444.193861] [2048.2] [pid=44166]   Processing part: '"'
[1223999444.193874] [2048.2] [pid=44166]   Not currently in macro.  
Running output (127): '/usr/local/libexec/nagios/check_nrpe2 -H 
foo.domain.com -c check_nagios_status -a "2"'
[1223999444.193887] [2048.1] [pid=44166]   Done.  Final output: 
'/usr/local/libexec/nagios/check_nrpe2 -H foo.domain.com -c 
check_nagios_status -a "2"'
[1223999444.193899] [2048.1] [pid=44166] **** END MACRO PROCESSING 
*************

The second to last line (Final output:) contains the exact command that 
Nagios executed.  Running this from the command line (as the Nagios 
user!) will go a long way toward helping you figure out the problem.

-- 
Sean McAfee
System Engineer

Collaborative Fusion, Inc.
 smcafee at collaborativefusion.com
 412-422-3463 x 4025

5849 Forbes Avenue
Pittsburgh, PA 15217

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