HTTP service gets CRITICAL, bad configuration?

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 7:36 pm

Box293 wrote:In your file localhost.cfg there will be a define service { for HTTP, please post that.

There you go:

# Define a service to check HTTP on the local machine.
# Disable notifications for this service by default, as not all users may have HTTP enabled.

define service{
        use                             local-service         ; Name of service template to use
        host_name                       localhost
        service_description             HTTP
        check_command                   check_http
        notifications_enabled           0
        }

Post by **Box293** » Wed Sep 02, 2015 7:43 pm

So looking at your configs, Nagios is using the following command:

Code: Select all

/usr/local/nagios/libexec/check_http -I 127.0.0.1

Can you run this again as it's using the -I (capital i) argument whereas @tmcdonald's command used the -H argument AND a dns name instead of an IP Address.

Code: Select all

su nagios
/usr/local/nagios/libexec/check_http -I 127.0.0.1 -vvv > /tmp/check_http.txt
echo $?

Post the results.

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 7:46 pm

Box293 wrote:So looking at your configs, Nagios is using the following command:
Code: Select all
/usr/local/nagios/libexec/check_http -I 127.0.0.1
Can you run this again as it's using the -I (capital i) argument whereas @tmcdonald's command used the -H argument AND a dns name instead of an IP Address.
Code: Select all
su nagios
/usr/local/nagios/libexec/check_http -I 127.0.0.1 -vvv > /tmp/check_http.txt
echo $?
Post the results.

Results as requested:

Code: Select all

GET / HTTP/1.0
User-Agent: check_http/v2.1.1 (nagios-plugins 2.1.1)
Connection: close
Accept: */*


http://127.0.0.1:80/ is 810 characters
STATUS: HTTP/1.1 500 Internal Server Error
**** HEADER ****
Date: Thu, 03 Sep 2015 00:45:50 GMT
Server: Apache/2.2.15 (CentOS)
Content-Length: 618
Connection: close
Content-Type: text/html; charset=iso-8859-1

**** CONTENT ****
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator,
 root@localhost and inform them of the time the error occurred,
and anything you might have done that may have
caused the error.</p>
<p>More information about this error may be available
in the server error log.</p>
<hr>
<address>Apache/2.2.15 (CentOS) Server at admin.qa.pdone.com Port 80</address>
</body></html>

HTTP CRITICAL: HTTP/1.1 500 Internal Server Error - 810 bytes in 0.001 second response time |time=0.001303s;;;0.000000 size=810B;;;0

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 7:55 pm

Thanks to @Box293 who point me on the right direction, after ran the latest command I can see where the issue was: bad configuration at VirtualHost definition in Apache side. Moving the localhost definition to the top make all services works good and Nagios stop showing me the CRITICAL flag. Also I did add a new ServerAlias 127.0.0.1. The VH definition looks like:

Code: Select all

<VirtualHost *:80>
    ServerName localhost
    ServerAlias xxx.xxx.xxx.xxx (public IP address)
    ServerAlias 127.0.0.1

    DocumentRoot /var/www/html
    <Directory /var/www/html>
        # enable the .htaccess rewrites
        AllowOverride All
        Order allow,deny
        Allow from All
    </Directory>
</VirtualHost>

Thanks to everyone

Post by **Box293** » Wed Sep 02, 2015 8:02 pm

Strange it works for -H 127.0.0.1 and not -I 127.0.0.1

Can you try deleting the file and creating again:

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rm -f /var/www/html/index.html
echo '' > /var/www/html/index.html

If that does not fix the problem, can you please post the results of these commands:

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ls -al /var/www/html/index.html
grep apache /etc/passwd
grep apache /etc/group

[/s]

I'm glad you fixed your issue

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HTTP service gets CRITICAL, bad configuration?

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