Nagios Core 4.0.5: Internal Server Error after upgrade

[DanielV_]

Hello,

I hope someone can help me with my problem. I have Nagios running since version 3 and currently i'm running version 4.0.3. In the past all the upgrades went fine, using the upgrade method that is described in the nagios documentation.

Last month I tried to upgrade to version 4.0.4.. I have downloaded the .tar en extracted it, configured it with the commandgroup nagcmd, and installed it. Installation went fine and nagios was running smoothly, but whenever I tried to use the links/commands on the right side of the screen (For example: Reschedule check command) Nagios gives an Internal Server Error. So I tried to fix this issue, but I couldn't resolve it. I also did some research on the internet, but all of the given solutions are not working, so I reverted the installation back to version 4.0.3. (from a snapshot in VMware).

This week I tried to upgrade version 4.0.3. to version 4.0.5., but I'm having the same problem again. Can someone please help me with this problem?

When I try to reach https://nagios.domain.com/nagios/cgi-bin/cmd.cgi the page is displayed correctly. So it seems the permissions are correct.

Installed on system:
LSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 6.2 (Final)
Release: 6.2
Codename: Final

[tmcdonald]

Can you post the last 20 or so lines from your Apache error logs after you try to view the page?

Also, what Apache and PHP versions are you running?

[DanielV_]

Yes of course,

I'm getting a premature end of script headers error in the Apache logs:

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httpd_error_log:
[Mon Apr 14 12:48:12 2014] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips mod_wsgi/3.2 Python/2.6.6 mod_perl/2.0.4 Perl/v5.10.1 configured -- resuming normal operations
[Tue Apr 15 16:15:08 2014] [error] [client 192.168.80.1] PHP Warning:  date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /usr/local/nagios/share/index.php on line 53
[Tue Apr 15 16:15:08 2014] [error] [client 192.168.80.1] PHP Warning:  date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /usr/local/nagios/share/main.php on line 123, referer: http://192.168.80.129/nagios/
[Tue Apr 15 16:22:46 2014] [error] [client 192.168.80.1] Tue Apr 15 16:22:46 2014 showgraph.cgi critical Cannot write to '/var/log/nagiosgraph-cgi.log', using STDERR instead, referer: http://192.168.80.129/nagios/cgi-bin/status.cgi?host=ASA-Avaya&servicestatustypes=4&hoststatustypes=15&serviceprops=0&hostprops=0
[Tue Apr 15 16:22:49 2014] [error] [client 192.168.80.1] Premature end of script headers: cmd.cgi, referer: http://192.168.80.129/nagios/cgi-bin/cmd.cgi?cmd_typ=7&host=ASA-Avaya&service=ASA&force_check
[Tue Apr 15 16:22:53 2014] [error] [client 192.168.80.1] Tue Apr 15 16:22:53 2014 showgraph.cgi critical Cannot write to '/var/log/nagiosgraph-cgi.log', using STDERR instead, referer: http://192.168.80.129/nagios/cgi-bin/status.cgi?host=all&type=detail&servicestatustypes=4&hoststatustypes=3&serviceprops=42
[Tue Apr 15 16:22:53 2014] [error] [client 192.168.80.1] Tue Apr 15 16:22:53 2014 showgraph.cgi critical Cannot write to '/var/log/nagiosgraph-cgi.log', using STDERR instead, referer: http://192.168.80.129/nagios/cgi-bin/status.cgi?host=all&type=detail&servicestatustypes=4&hoststatustypes=3&serviceprops=42
[Tue Apr 15 16:22:55 2014] [error] [client 192.168.80.1] Premature end of script headers: cmd.cgi, referer: http://192.168.80.129/nagios/cgi-bin/cmd.cgi?cmd_typ=7&host=ASA-Avaya&service=ASA&force_check
[Tue Apr 15 16:23:01 2014] [error] [client 192.168.80.1] Premature end of script headers: cmd.cgi, referer: http://192.168.80.129/nagios/cgi-bin/cmd.cgi?cmd_typ=7&host=Linux_Views&service=Load&force_check

I'm using Apache/2.2.15 and PHP 5.3.3 (cli).

I think it's very strange this happens after the upgrade. All of the previous upgrade went all well.

[lmiltchev]

Can you run the following commands and show us the output?

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ls -la /var/log/nagiosgraph-cgi.log
sestatus

[DanielV_]

SELinux is disabled. And it seems that the permissions are on root for nagiosgraph-cgi.log.

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[root@SRVNAGIOS01 nagios-4.0.5]# ls -la /var/log/nagiosgraph-cgi.log
-rwxr-xr-x 1 root root 0 Mar 17 13:21 /var/log/nagiosgraph-cgi.log
[root@SRVNAGIOS01 nagios-4.0.5]# sestatus
SELinux status:                 disabled

The old working installation of Nagios (4.0.3.) also has the same permission on this:

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[root@SRVNAGIOS01 ~]# ls -la /var/log/nagiosgraph-cgi.log
-rwxr-xr-x 1 root root 0 Mar 17 13:21 /var/log/nagiosgraph-cgi.log

[lmiltchev]

This doesn't seem to be a nagios issue, but nagiosgraph issue...

Have you tried changing the permissions of the log file to nagios:nagios?

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chown nagios:nagios /var/log/nagiosgraph-cgi.log