Add Monitoring targets to nagios server

Add Monitoring Targets To Nagios Server:

These Steps will perform on CLIENT MACHINE.

For adding monitor targets to nagios server, To do that you have to to install following two packages in your monitoring targets:

                                  

                                   1. nrpe

                                   2. nagios-plugin

These packages will not found in yum repository, so let us add the EPEL Repository to install packages.

Use the following command for installation:

                                   

                                   #yum install nrpe nagios-plugins-all -y

Configure Monitoring Targets:

For configure Monitoring targets edit /etc/nagios/nrpe.cfg and do this:

                                  #vim /etc/nagios/nrpe.cfg

                                  allow_hosts=127.0.0.1 192.168.0.220  ( Nagios server IP, add in line no. 81)

save & exit.

Start the nrpe service:

                                 #service nrpe restart

              #chkconfig nrpe on

Now come on NAGIOS SERVER MACHINE:

For add the clients:

                           #vim /etc/nagios/nagios.cfg

                            uncomment Line No. 52

                            cfg_dir=/etc/nagios/server

save & exit.

Create a directory "server", under "/etc/nagios":

                           #mkdir /etc/nagios/server

Create config file to the client to be monitored.

                            #vim /etc/nagios/server/clients.cfg

                               define host{

                               use                  linux-server

                               host_name      client

                               alias                client

                               address            192.168.0.200 (client ip)

                               check_period   24x7

                               notification_interval      30

                               notification_period        24x7

                               }

save & exit.

Restart Nagios service:

                             #service nagios restart

             #chkconfig nagios on

Open Nagios admin console in browser with server ip.
              If server ip is 192.168.0.220 then open browser and go to:

             http://192.168.0.220/nagios

and enter the username and password as administrator.

Click on "hosts". you will see the newly added client will be visible there.

You can define more clients by creating a seprate file under the "/etc/nagios/server" directory for each client.