How to install and configure Nagios in FreeBSD

Source : http://www.unixmen.com/how-to-install-and-configure-nagios-in-freebsd/

*there is some part I modified to make some improvement.

Nagios is a popular open source computer system and network monitoring software application. It watches hosts and services, alerting users when things go wrong and again when they get better.

Nagios was originally designed to run under Linux, but also runs well on other Unix variants. It is free software, licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

In this tutorial will show you how to install Nagios in freeBSD (Tested on FreeBSD 8.1  and  8.2).

We will start by installing AMP and then we will install Nagios.

1-  Install Mysql Server 5.5 from ports

cd /usr/ports/databases/mysql55-servermake install clean

2- Enable and launch the mysql service

echo 'mysql_enable="YES"' >> /etc/rc.conf

3- Start mysql server

/usr/local/etc/rc.d/mysql-server start

4- Make mysql  admin password

mysqladmin -u root password "newpassword"

5-Install  Apache  from ports

cd /usr/ports/www/apache22 make install clean 

Enable mysql-support in the blue screen

6-Enable and launch the apache service

echo 'apache22_enable="YES"' >> /etc/rc.conf
 

Start Apache:

/usr/local/etc/rc.d/apache22 start

test ths apache page http://ip or http://hostname

7-Install  PHP and  php-extention

 
cd /usr/ports/lang/php52
make install clean

Make sure to enable apache module in the install  Step (Blue screen) and

cd /usr/ports/lang/php52-extensions
make install clean

In this  installation screen select sessions and mysql support

8-After this  Activate  the  php configuration with

cp /usr/local/etc/php.ini-dist /usr/local/etc/php.ini

9-configure apache to read the PHP files

edit /usr/local/etc/apache22/httpd.conf and add

DirectoryIndex index.php index.html index.htm AddType application/x-httpd-php .phpAddType application/x-httpd-php-source .phps

10-Restart   apache  to check if  you  have  any  errors

# /usr/local/etc/rc.d/apache22 restart

Output:
Performing sanity check on apache22 configuration:
Syntax OK
Stopping apache22.
Waiting for PIDS: 61539.
Performing sanity check on apache22 configuration:
Syntax OK
Starting apache22.

11-Check  phpinfo page

Document root  starndart in apache  is    /usr/local/www/apache22/data
Add the code to the file test.hpecho “<? phpinfo(); ?>” >> /usr/local/www/apache22/data/test.php

Now check the page http://ip/test.php

12-Install Nagios:

cd /usr/ports/net-mgmt/nagios
make install clean

And  accept  default  installation, in   installation screen  of  nagios plugins dont forget to  add  NETSNMP to nagios group and user.

13-Enable nagios  to  start  with  boot

echo 'nagios_enable="YES"' >> /etc/rc.conf

Now copy the sample page to the config files

cd /usr/local/etc/nagios/

cp cgi.cfg-sample cgi.cfg
cp nagios.cfg-sample nagios.cfg
cp resource.cfg-sample resource.cfg

Navigate to the /usr/local/etc/nagios/objects/ and  do the  same :

cp commands.cfg-sample commands.cfg

cp contacts.cfg-sample contacts.cfg

cp localhost.cfg-sample localhost.cfg

cp printer.cfg-sample printer.cfg

cp switch.cfg-sample switch.cfg

cp templates.cfg-sample templates.cfg

cp timeperiods.cfg-sample timeperiods.cfg

14-Now check you nagios configurations errors

#  nagios -v  /usr/local/etc/nagios/nagios.cfg

15-Make admin password for nagios home page (admin is nagiosadmin)

htpasswd -c /usr/local/etc/nagios/htpasswd.users nagiosadmin

16-Now  add  Nagios  to  your  apache  configuration:

edit  /usr/local/etc/apache22/httpd.conf  and  add:

LoadModule php5_module        libexec/apache22/libphp5.so

LoadModule cgi_module         libexec/apache22/mod_cgi.so

<IfModule php5_module>

       DirectoryIndex index.php index.html

       AddType application/x-httpd-php .php

       AddType application/x-httpd-php-source .phps

   </IfModule>

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

Alias /nagios /usr/local/www/nagios/
<Directory /usr/local/www/nagios>

Options None

AllowOverride None

Order allow,deny

Allow from all

AuthName “Nagios Access”

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 “Nagios Access”

AuthType Basic

AuthUSerFile /usr/local/etc/nagios/htpasswd.users

Require valid-user

</Directory>

save  the  config and exit

17-Restart apache to check if any errors

/usr/local/etc/rc.d/apache22 restart

Now  open your  nagios  page  with  Http://ip/nagios and  insert  your  login and  password created  before

to setiing authentication permissions you must edit cgi.cfg
like below :

a) add an user to Nagios via command htpasswd htpasswd.users username

b) in cgi.cfg file add this user to lines:

authorized_for_system_information=nagiosadmin, username
authorized_for_configuration_information=nagiosadmin, username
authorized_for_system_commands=nagiosadmin, username
authorized_for_all_services=nagiosadmin, username
authorized_for_all_hosts=nagiosadmin, username
authorized_for_all_service_commands=nagiosadmin, username
authorized_for_all_host_commands=nagiosadmin, username