Agenda: nagios-exercises.txt

NAGIOS MONITORING
-----------------

On Master server

1. Go to Nagios working directory

        # cd /usr/local/etc/nagios
        
2. Copy Nagios sample files

        To do this, make sure you are in Nagios working directory from the first step
        There are Nagios's sample files in the directory, which we need to copy them as working copy.
        
        # cp cgi.cfg-sample cgi.cfg
        # cp nagios.cfg-sample nagios.cfg
        # cp resource.cfg-sample resource.cfg
        # cp objects/commands.cfg-sample objects/commands.cfg
        # cp objects/contacts.cfg-sample objects/contacts.cfg
        # cp objects/localhost.cfg-sample objects/localhost.cfg
        # cp objects/templates.cfg-sample objects/templates.cfg
        # cp objects/timeperiods.cfg-sample objects/timeperiods.cfg

        
3. Create monitoring configuration files for DNS Servers 

        While are you still in Nagios working directory, create a new file for DNS servers monitoring
        
        ** Remember to change xxx to your group
        
        # Edit objects/dns-server.cfg
        
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### Define the host server 

define host{
        use                     freebsd-server
        host_name               cache
        alias                   cache
        address                 10.10.xxx.2
}

define host{
        use                     freebsd-server
        host_name               auth
        alias                   auth
        address                 10.10.xxx.3
}

### Define the group

define hostgroup{
        hostgroup_name  dns-servers
        alias           DNS Servers
        members         cache, auth
}

### Define Services

define service {
        use                             generic-service         ; Name of service template to use
        host_name                       cache
        service_description             PING
        check_command                   check_ping!100.0,20%!500.0,60%
}

define service {
        use                             generic-service         ; Name of service template to use
        host_name                       auth
        service_description             PING
        check_command                   check_ping!100.0,20%!500.0,60%
}

define service {
        use                             generic-service         ; Name of service template to use
        host_name                       auth
        service_description             Check DNS
        check_command                   check_dns!noc.ws.nsrc.org
}

define service {
        use                             generic-service         ; Name of service template to use
        host_name                       cache
        service_description             Check DNS
        check_command                   check_dns!noc.ws.nsrc.org
}

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4. Add check_dns service

        By default, Nagios doesn't configure check_dns service, we need to add line below into commands.cfg
        
        # Edit objects/commands.cfg


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define command{ 
        command_name    check_dns
        command_line    $USER1$/check_dns -H $HOSTADDRESS$ -s $ARG1$
}

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5. Enable DNS monitoring group in Nagios configuration files

        Now you have DNS Server monitoring files (dns-server.cfg) created. We need to enable on nagios.cfg file for monitoring
        
        # Edit /usr/local/etc/nagios/nagios.cfg

        Look for the line "cfg_file=/usr/local/etc/nagios/objects/localhost.cfg" and add below content
        
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# Definition for DNS servers
cfg_file=/usr/local/etc/nagios/objects/dns-servers.cfg

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6. Enable Nagios service 

        To enable nagios service add the line below in /etc/rc.conf
        
        nagios_enable="YES"
        
        
7. Start Nagios service

        To start nagios service
        
        # /usr/local/etc/rc.d/nagios start
        
        Nagios should be running right now without any error report.


#. Create Apache password authentication file for Nagios 

        Nagios required authentication via http to gain admin access to it web interface. 
        Let's create the password file
        
        # htpasswd -c /usr/local/etc/apache22/nagios.auth nagiosadmin
        
        Set your desire password 
        
        Password file is now created
        
#. Create Nagios' Apache configuration for web interface access

        Go to Apache directory 
        
        # cd /usr/local/etc/apache22 
        
        Create a new file 
        
        # Edit Includes/nagios.conf
        
        Add the line below info the file 
        
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AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps

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

<Directory "/usr/local/www/nagios/cgi-bin">
        Options ExecCGI
        AllowOverride None
        Order allow,deny
        Allow from all
        AuthName "Nagios Access"
        AuthType Basic
        Require valid-user
        AuthUserFile /usr/local/etc/apache22/nagios.auth
</Directory>

<Directory "/usr/local/www/nagios">
        AllowOverride None
        Order allow,deny
        Allow from all
        AuthName "Nagios Access"
        AuthType Basic
        Require valid-user
        AuthUserFile /usr/local/etc/apache22/nagios.auth
</Directory>

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        # In /usr/local/etc/apache22/httpd.conf, find the line:

DirectoryIndex index.html
        
        And change it to:
        
DirectoryIndex index.html index.php

        # Enable and start Apache web service
        Add into /etc/rc.conf
        apache22_enable="YES"
        
        # /usr/local/etc/rc.d/apache22 start
        
        Access to Nagios web page via http://10.10.xxx.1/nagios/index.php