How to install and configure Nagios in FreeBSD

To configure Nagios

Now enter the Nagios directory to configure it. Utilize the following command to access the directory.

root@linuxhelp:~ # cd /usr/local/etc/nagios/
root@linuxhelp:/usr/local/etc/nagios # ls
cgi.cfg-sample objects
nagios.cfg-sample resource.cfg-sample

Inside the directory rename all the " .cfg-sample" file to " .cfg" as follows.

root@linuxhelp:/usr/local/etc/nagios # cp cgi.cfg-sample cgi.cfg
root@linuxhelp:/usr/local/etc/nagios # cp nagios.cfg-sample nagios.cfg
root@linuxhelp:/usr/local/etc/nagios # cp resource.cfg-sample resource.cfg

Once it is done, run the following command to enter the object directory.

root@linuxhelp:/usr/local/etc/nagios # cd objects/
root@linuxhelp:/usr/local/etc/nagios/objects # ll
total 44
-rw-r--r-- 1 root wheel 7716 Oct 11 19:06 commands.cfg-sample
-rw-r--r-- 1 root wheel 2166 Oct 11 19:06 contacts.cfg-sample
-rw-r--r-- 1 root wheel 5415 Oct 11 19:06 localhost.cfg-sample
-rw-r--r-- 1 root wheel 3124 Oct 11 19:06 printer.cfg-sample
-rw-r--r-- 1 root wheel 3293 Oct 11 19:06 switch.cfg-sample
-rw-r--r-- 1 root wheel 10824 Oct 11 19:06 templates.cfg-sample
-rw-r--r-- 1 root wheel 3208 Oct 11 19:06 timeperiods.cfg-sample

Now again rename all the “ .cfg-sample” files to “ .cfg” as follows.

root@linuxhelp:/usr/local/etc/nagios/objects # cp commands.cfg-sample commands.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp contacts.cfg-sample co
commands.cfg commands.cfg-sample contacts.cfg-sample
root@linuxhelp:/usr/local/etc/nagios/objects # cp contacts.cfg-sample contacts.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp localhost.cfg-sample localhost.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp printer.cfg-sample printer.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp switch.cfg-sample switch.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp templates.cfg-sample templates.cfg
root@linuxhelp:/usr/local/etc/nagios/objects # cp timeperiods.cfg-sample timeperiods.cfg

After renaming the files, invoke the following command to check the Nagios configuration.

root@linuxhelp:/usr/local/etc/nagios/objects # nagios -v /usr/local/etc/nagios/nagios.cfg

Nagios Core 3.5.1
Copyright (c) 2009-2011 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-30-2013
License: GPL

.
.
.
Checking for circular paths between hosts...
Checking for circular host and service dependencies...
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors: 0

Things look okay - No serious problems were detected during the pre-flight check
root@linuxhelp:/usr/local/etc/nagios/objects #
Add nagios admin user
root@linuxhelp:/usr/local/etc/nagios/objects # htpasswd -c /usr/local/etc/nagios/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin

Use the following command to configure the httpd.conf file as follows.

root@linuxhelp:/usr/local/etc/nagios/objects # nano /usr.local/etc/apache24/httpd.conf
.
.
.
< IfModule !mpm_prefork_module> 
LoadModule cgid_module libexec/apache24/mod_cgid.so
< /IfModule> 
< IfModule mpm_prefork_module> 
LoadModule cgi_module libexec/apache24/mod_cgi.so
< /IfModule> 
.
.
.
< Directory /> 
AllowOverride none
#Require all denied
Order Allow,Deny
Allow from All
< /Directory> 
.
.
.

.
< FilesMatch " .php$" > 
SetHandler application/x-httpd-php
< /FilesMatch> 
< FilesMatch " .phps$" > 
SetHandler application/x-httpd-php-source
< /FilesMatch> 

< Directory /usr/local/www/nagios> 
AllowOverride None
Order deny,allow
Deny from all
Allow from all
php_flag engine on
php_admin_value open_basedir /usr/local/www/nagios/:/var/spool/nagios/
AuthName " admin" 
AuthType Basic
AuthUSerFile /usr/local/etc/nagios/htpasswd.users
Require valid-user
< /Directory> 

< Directory /usr/local/www/nagios/cgi-bin> 
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from All
AuthName " admin" 
AuthType Basic
AuthUSerFile /usr/local/etc/nagios/htpasswd.users
Require valid-user
< /Directory> 

ScriptAlias /nagios/cgi-bin/ /usr/local/www/nagios/cgi-bin/
Alias /nagios/ /usr/local/www/nagios/

After the configuration, enable the Nagios service with the following command.

root@linuxhelp:~ # service nagios start
Performing sanity check of nagios configuration: OK
Starting nagios.

Once Nagios is enabled, run the following command to restart Apache service.

root@linuxhelp:~ # service apache24 restart
Performing sanity check on apache24 configuration:
Syntax OK
Stopping apache24.
Waiting for PIDS: 1928.
Performing sanity check on apache24 configuration:
Syntax OK
Starting apache24.

Now Nagios is ready to use. Open your web-browser and call your local host IP address as follows.
http://192.168.7.130/nagios/

Enter your user login credentials.

You' ll be taken to Nagios Dashboard.

The service status details for all hosts are displayed.