Nagios3 on CentOS: Quick Install Script

As part my job, I find myself doing Nagios installs on a somewhat regular basis. The following is a quick guide on installing Nagios 3 on CentOS, distilled from the official Nagios docs. It is meant to be copied and run as a shell script (you should only have to update the passwords):

#!/bin/sh

# Any Failing Command Will Cause The Script To Stop
set -e

# Treat Unset Variables As Errors
set -u

echo "***** Starting Nagios Quick-Install: " `date`
echo "***** Installing pre-requisites"
 yum -y install httpd
yum -y install gcc
yum -y install glibc glibc-common
yum -y install gd gd-devel

echo "***** Setting up the environment"
useradd -m nagios
echo "INSERT_PASSWORD_HERE" |passwd --stdin nagios
 groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

echo "***** Getting the Nagios Source and Plug-Ins"
cd /usr/local/src
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.0.tar.gz
 wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.14.tar.gz
tar xzf nagios-3.2.0.tar.gz
 tar xzf nagios-plugins-1.4.14.tar.gz

echo "***** Installing Nagios"
cd /usr/local/src/nagios-3.2.0
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
 make install-commandmode
make install-webconf

echo "***** Setting up htpasswd auth"
htpasswd -nb nagiosadmin INSERT_PASSWORD_HERE > /usr/local/nagios/etc/htpasswd.users
service httpd restart
 
echo "***** Setting up Nagios Plug-Ins"
cd /usr/local/src/nagios-plugins-1.4.13
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

echo "***** Fixing SELinux"
 chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/
chcon -R -t httpd_sys_content_t /usr/local/nagios/share/

echo "***** Starting Nagios"
chkconfig --add nagios
chkconfig nagios on
service nagios start
 
echo "***** Done: " `date`