Install nagios on CentOS client

client_guide

> wget dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
> rpm -ivh epel-release-6-8.noarch.rpm
> yum install nrpe nagios-plugins-all openssl
  
  Then go to '/etc/nagios/nrpe.cfg '
  
  and update the 
  
  allowed_hosts=nagios.change_me.com
  
  Finally, 
  
  sudo service nrpe restart
  
  And also restart the server.