Network monitoring

1. yum install nagios.
2. Start the httpd and nagios services.
3. Set the Nagios administrator password using htpasswd -c /etc/nagios/passwd nagiosadmin.
4. Define the network to be monitored by editing Nagios' configuration files. You can place your configuration in /etc/nagios/conf.g/*foo.cfg*. For example, the following will define a host named smtp.example.com and also check that smtp.example.com is providing an SMTP service:

define host {
      use                     linux-server
      host_name               smtp.example.com
      address                 10.1.10.1
}

define service {
      use                     generic-service
      host_name               smtp.example.com
      service_description     SMTP
      check_command           check_smtp
      notifications_enabled   0
}

5. Load http://localhost/nagios in a browser. (Note securing Nagios so that it can be accessed away from localhost is beyond the scope of these notes.)

Fedora packages plugins such as check_smtp separately from the core Nagios package installed above. The following packages provide common plugins: