HTTP service gets CRITICAL, bad configuration?

reynierpm · Post by **reynierpm** » Mon Aug 31, 2015 10:01 pm

Hi there, I am compiled and installed Nagios and I didn't setup anything else. After start Nagios and goes to web interface I can see HTTP service is getting CRITICAL flag and service is up and running. I think I am missing something on the configuration but I don't know where to look - for the right documentation - or what to change in configuration files. At localhost.cfg I can see this service definition:

Code: Select all

# 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
        }

Then at commands.cfg I have this:

Code: Select all

# 'check_http' command definition
define command{
        command_name    check_http
        command_line    $USER1$/check_http -I $HOSTADDRESS$ $ARG1$
        }

What is missing here?

hsmith · Post by **hsmith** » Tue Sep 01, 2015 9:02 am

reynierpm wrote:Hi there, I am compiled and installed Nagios and I didn't setup anything else. After start Nagios and goes to web interface I can see HTTP service is getting CRITICAL flag and service is up and running. I think I am missing something on the configuration but I don't know where to look - for the right documentation - or what to change in configuration files. At localhost.cfg I can see this service definition:
Code: Select all
# 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
        }
Then at commands.cfg I have this:
Code: Select all
# 'check_http' command definition
define command{
        command_name    check_http
        command_line    $USER1$/check_http -I $HOSTADDRESS$ $ARG1$
        }
What is missing here?

What OS did you install Nagios on?
What version of Nagios did you install?
What does the return of a service httpd status look like?

reynierpm · Post by **reynierpm** » Tue Sep 01, 2015 9:00 pm

hsmith wrote: What OS did you install Nagios on?
What version of Nagios did you install?
What does the return of a service httpd status look like?

What OS did you install Nagios on? => CentOS 6.7
What version of Nagios did you install? => Nagios Core 4.1.1
What does the return of a service httpd status look like?[/quote] => httpd (pid 24075) is running...

hsmith · Post by **hsmith** » Wed Sep 02, 2015 9:32 am

reynierpm wrote:
hsmith wrote: What OS did you install Nagios on?
What version of Nagios did you install?
What does the return of a service httpd status look like?
What OS did you install Nagios on? => CentOS 6.7
What version of Nagios did you install? => Nagios Core 4.1.1
What does the return of a service httpd status look like? => httpd (pid 24075) is running...

What's SELinux up to?

Try issuing a getenforce.

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 9:37 am

Code: Select all

# getenforce
Disabled

SELINUX is disabled

hsmith · Post by **hsmith** » Wed Sep 02, 2015 9:44 am

What do the permissions on your /usr/local/nagios/libexec directory look like? ls -l /usr/local/nagios/libexec

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 9:48 am

Here:

Code: Select all

# ls -l /usr/local/nagios/libexec
total 5800
-rwxr-xr-x 1 nagios nagios 180378 Aug 31 20:53 check_apt
-rwxr-xr-x 1 nagios nagios   2309 Aug 31 20:53 check_breeze
-rwxr-xr-x 1 nagios nagios 183255 Aug 31 20:53 check_by_ssh
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_clamd -> check_tcp
-rwxr-xr-x 1 nagios nagios 138601 Aug 31 20:53 check_cluster
-r-sr-xr-x 1 root   nagios 177049 Aug 31 20:53 check_dhcp
-rwxr-xr-x 1 nagios nagios 178225 Aug 31 20:53 check_dig
-rwxr-xr-x 1 nagios nagios 195820 Aug 31 20:53 check_disk
-rwxr-xr-x 1 nagios nagios   9348 Aug 31 20:53 check_disk_smb
-rwxr-xr-x 1 nagios nagios 194726 Aug 31 20:53 check_dns
-rwxr-xr-x 1 nagios nagios  87302 Aug 31 20:53 check_dummy
-rwxr-xr-x 1 nagios nagios   3542 Aug 31 20:53 check_file_age
-rwxr-xr-x 1 nagios nagios   6375 Aug 31 20:53 check_flexlm
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_ftp -> check_tcp
-rwxr-xr-x 1 nagios nagios 283767 Aug 31 20:53 check_http
-r-sr-xr-x 1 root   nagios 183262 Aug 31 20:53 check_icmp
-rwxr-xr-x 1 nagios nagios 147251 Aug 31 20:53 check_ide_smart
-rwxr-xr-x 1 nagios nagios  15238 Aug 31 20:53 check_ifoperstatus
-rwxr-xr-x 1 nagios nagios  13386 Aug 31 20:53 check_ifstatus
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_imap -> check_tcp
-rwxr-xr-x 1 nagios nagios   6947 Aug 31 20:53 check_ircd
-rwxr-xr-x 1 nagios nagios 159764 Aug 31 20:53 check_load
-rwxr-xr-x 1 nagios nagios   6595 Aug 31 20:53 check_log
-rwxr-xr-x 1 nagios nagios  22730 Aug 31 20:53 check_mailq
-rwxr-xr-x 1 nagios nagios 145337 Aug 31 20:53 check_mrtg
-rwxr-xr-x 1 nagios nagios 146574 Aug 31 20:53 check_mrtgtraf
-rwxr-xr-x 1 nagios nagios 159034 Aug 31 20:53 check_nagios
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_nntp -> check_tcp
-rwxr-xr-x 1 nagios nagios 181138 Aug 31 20:53 check_nt
-rwxr-xr-x 1 nagios nagios 184885 Aug 31 20:53 check_ntp
-rwxr-xr-x 1 nagios nagios 176682 Aug 31 20:53 check_ntp_peer
-rwxr-xr-x 1 nagios nagios 172223 Aug 31 20:53 check_ntp_time
-rwxr-xr-x 1 nagios nagios 213167 Aug 31 20:53 check_nwstat
-rwxr-xr-x 1 nagios nagios   8926 Aug 31 20:53 check_oracle
-rwxr-xr-x 1 nagios nagios 161573 Aug 31 20:53 check_overcr
-rwxr-xr-x 1 nagios nagios 185006 Aug 31 20:53 check_ping
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_pop -> check_tcp
-rwxr-xr-x 1 nagios nagios 188874 Aug 31 20:53 check_procs
-rwxr-xr-x 1 nagios nagios 158327 Aug 31 20:53 check_real
-rwxr-xr-x 1 nagios nagios   9642 Aug 31 20:53 check_rpc
-rwxr-xr-x 1 nagios nagios   1465 Aug 31 20:53 check_sensors
-rwxr-xr-x 1 nagios nagios 191184 Aug 31 20:53 check_smtp
-rwxr-xr-x 1 nagios nagios 156774 Aug 31 20:53 check_ssh
-rwxr-xr-x 1 nagios nagios 144169 Aug 31 20:53 check_swap
-rwxr-xr-x 1 nagios nagios 171082 Aug 31 20:53 check_tcp
-rwxr-xr-x 1 nagios nagios 159349 Aug 31 20:53 check_time
lrwxrwxrwx 1 root   root        9 Aug 31 20:53 check_udp -> check_tcp
-rwxr-xr-x 1 nagios nagios 169685 Aug 31 20:53 check_ups
-rwxr-xr-x 1 nagios nagios 139395 Aug 31 20:53 check_uptime
-rwxr-xr-x 1 nagios nagios 137241 Aug 31 20:53 check_users
-rwxr-xr-x 1 nagios nagios   2995 Aug 31 20:53 check_wave
drwxr-xr-x 4 nagios nagios   4096 Aug 31 20:45 eventhandlers
-rwxr-xr-x 1 nagios nagios 132332 Aug 31 20:53 negate
-rwxr-xr-x 1 nagios nagios 127118 Aug 31 20:53 urlize
-rwxr-xr-x 1 nagios nagios   1949 Aug 31 20:53 utils.pm
-rwxr-xr-x 1 nagios nagios   2791 Aug 31 20:53 utils.sh

hsmith · Post by **hsmith** » Wed Sep 02, 2015 9:59 am

What's the output of this when done from the command line?

/usr/local/nagios/libexec/check_http -H localhost

reynierpm · Post by **reynierpm** » Wed Sep 02, 2015 10:10 am

hsmith wrote:What's the output of this when done from the command line?
/usr/local/nagios/libexec/check_http -H localhost

I've some VirtualHost defined on this server so here are my tests:

run the command above

Code: Select all

# /usr/local/nagios/libexec/check_http -H localhost
HTTP CRITICAL: HTTP/1.1 500 Internal Server Error - 801 bytes in 0.002 second response time |time=0.001728s;;;0.000000 size=801B;;;0

Change my VirtualHost to this:

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<VirtualHost *:80>
    ServerName admin.qa.pdone.com
    ServerAlias api.qa.pdone.com
    ServerAlias share.qa.pdone.com

    DocumentRoot /var/www/html/mt020415-00-pdonereptool/web
    <Directory /var/www/html/mt020415-00-pdonereptool/web>
        # enable the .htaccess rewrites
        AllowOverride All
        Order allow,deny
        Allow from All
    </Directory>

    ErrorLog /var/log/httpd/pdone_error.log

    LogFormat "%h %l %t \"%r\" \"%{X-PDONE-SESSION-ID}i\" %>s %b" common
    CustomLog /var/log/httpd/pdone_access.log common
</VirtualHost>

<VirtualHost *:80>
    ServerName localhost
    ServerAlias xxx.xxxx.xxxx.xxx

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

Tried the same command again:

Code: Select all

# /usr/local/nagios/libexec/check_http -H localhost
HTTP WARNING: HTTP/1.1 403 Forbidden - 5159 bytes in 0.002 second response time |time=0.001546s;;;0.000000 size=5159B;;;0

I should check for this domains "admin.qa.pdone.com, api.qa.pdone.com, share.qa.pdone.com" I think, if they are alive then all should be good right? My concern around this is what happen if DNS fails and HTTP service still up & running, on this case check for HTTP server at localhost will be better, right?

jdalrymple · Post by **jdalrymple** » Wed Sep 02, 2015 10:17 am

Can you try to create an empty file /var/www/html/index.html and see if that resolves your problem?

**Edit**

To expand on what I asked, by default you will get 403 forbidden when running check_http against localhost in a CentOS box because directory listing is forbidden and you have no index file. If you create the file it will change the behavior of the system. It's a common occurrence that a base install of Nagios on base CentOS will have the problem you described if there is no index file in /var/www/html.

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HTTP service gets CRITICAL, bad configuration?

HTTP service gets CRITICAL, bad configuration?

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