Nagios

Many of the services are monitored via SNMP, which means it must be installed and running on each monitored host.

This instructions are for a regular Nagios installation and plug-ins, for detailed explanation to setup and configuration see the following sections:

• Nagios Hosts configuration
• Nagios Plugins configuration

Installation

1. Install Nagios dependencies
2. Install Nagios plug-ins dependencies
3. Install Nagios
4. Create password for web admistrator

The commands for the above instructions are:

# yum install fping perl-Crypt-DES perl-Net-SNMP perl-Socket6
# yum install perl-XML-Parser mod_perl perl-Frontier-RPC perl-XML-XPath
# yum install nagios nagios-plugins nagios-plugins-nrpe
# htpasswd -c /etc/nagios/htpasswd.users nagiosadmin

Standard Configuration

• Check this values in /etc/nagios/cgi.cfg{}

use_authentication=1
authorized_for_system_information=nagiosadmin
authorized_for_configuration_information=nagiosadmin
authorized_for_system_commands=nagiosadmin
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin

• To monitor apache, un comment the following lines

ExtendedStatus On

<Location /server-status>
       SetHandler server-status
       Order deny,allow
       Deny from all
       Allow from 127.0.0.1
</Location>

Plug-ins

Some 3rd party plug-ins that might help to check hosts via snmp without a Nagios agent

• check_snmp_storage.pl
• check_snmp_int.pl
• check_snmp_load.pl
• check_snmp_mem.pl
• check_snmp_win.pl
• check_snmp_env.pl
• check_snmp_netint.pl
• check_omsa_snmp.pl
• check_snmp_printer
• check_javaproc.pl