Installing Nagios 3.4.4 On CentOS 6.3


Nagios is a monitoring tool under GPL licence. This tool lets you
monitor servers, network hardware (switches, routers, …) and
applications. A lot of plugins are available and its big community makes Nagios the biggest open source monitoring tool. This tutorial shows how to install Nagios 3.4.4 on CentOS 6.3.

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After installing your CentOS server, you have to disable selinux & install some packages to make nagios work.

To disable selinux, open the file: /etc/selinux/config

# vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=permissive // change this value to disabled
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.

Now, download all packages you need:

# yum install  gd gd-devel httpd php  gcc glibc glibc-common


Nagios Installation

Create a directory:

# mkdir /root/nagios

Navigate to this directory:

# cd /root/nagios 

Download nagios-core & plugin:

# wget
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Untar nagios core:

# tar xvzf nagios-3.4.4.tar.gz

 Go to the nagios dir:

# cd nagios

Configure before make:

# ./configure

Make all necessary files for Nagios:

# make all


# make install
# make install-init
# make install-commandmode
 # make install-config
# make install-webconf

Create a password to log into the web interface:

 # htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Start the service and start it on boot:

# chkconfig nagios on
# service nagios start

Now, you have to install the plugins:

# cd ..
# tar xvzf nagios-plugins-1.4.15.tar.gz
# cd nagios-plugins-1.4.15
# ./configure
# make
# make install

 Start the apache service and enable it on boot:

# service httpd start
# chkconfig httpd on

Now, connect to your nagios system:

http://Your-Nagios-IP/nagios and enter login : nagiosadmin & password you have chosen above.


And after the installation ?

the installation you have to configure all your host & services in
nagios configuration files.This step is performed in command line and is
complicated, so I recommand to install tool like Centreon, that is a
beautiful front-end to add you host & services.

To go further, I recommend you to read my article on Nagios & Centreon monitoring.

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