Installing nagios by hand is good but not recommended.Instead use a small script to do the job for you...because being an system admin you have lot of thing to take care...so the time will be crucial factor. But having said I have had no intention to make it a point that you automate whatever you want. Sometime the automation has the adverse effect on system.You do automation when it must require and need.
I do not issue any guarantee that this will work for you.
So the script for installing Nagios and it's plugins from source is below...u can also enhance it if you want...
# This script will install Nagios from source along with the plugins.
wget -c http://osdn.dl.sourceforge.net/sourceforge/nagios/nagios-3.0.6.tar.gz
wget -c http://osdn.dl.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.11.tar.gz
mkdir -p $dir
grep -i “red hat” /etc/issue>/dev/null2>&1
if [ `echo $? ` = 0 ];then
useradd -G nagios nagios
tar xzf nagios-plugins-1.4.11.tar.gz
./configure –prefix=/usr/local/nagios –enable-redhat-pthread-workaround
tar xzf nagios-3.0.6.tar.gz
# make sure xinetd is installed.
echo ” nrpe 5666/tcp #nrpe” >> /etc/services
chown -R nagios.nagios /usr/local/nagios
service xinetd [...]
But one word caution for heaven's sake please investigate manually or put some mechanism within the script to check that everything done as required.
Hope this will help.