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Installing Nagios 3.2.1 in CentOS 5

Here’s a quick step-by-step procedure on how to install Nagios Monitoring in CentOS 5. The installation is straightforward. You just have to copy and paste it to your SSH Terminal.
yum update
yum install httpd php
yum install gcc glibc glibc-common
yum install gd gd-devel
/usr/sbin/useradd -m nagios
passwd nagios
set nagios as password (I used nagios)
/usr/sbin/groupadd nagcmd
/usr/sbin/usermod -a -G nagcmd [...]