Nagios centos 6.5
INFO: Nagios3 is not included in base centos repositories, you need to install rpmforge repository
You can install nagios4 from sources as described here: https://www.voipmonitor.org/doc/Nagios_4
Installation using rpmforge:
Install RPM forge for centos 6 (http://wiki.centos.org/AdditionalResources/Repositories/RPMForge#)
For x86_64:
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
For i686:
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i686.rpm
For x86_64 or i686:
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt rpm -i rpmforge-release-0.5.3-1.el6.rf.*.rpm
Install nagios plugins:
yum install nagios yum install nagios-plugins
Edit and add line into nagios configuration
vim /etc/nagios/nagios.cfg
cfg_file=/etc/nagios/objects/vm.cfg
Change privileges for nagios and voipmonitor
touch /etc/nagios/objects/vm.cfg chown apache /etc/nagios/objects/vm.cfg
vim /etc/sudoers check option and add line apache ...
Defaults requiretty apache ALL=(nagios) NOPASSWD: ALL
chown -R nagios:nagios /var/nagios/spool/checkresults