Thursday, 14 June 2012

Install Nagios on CentOS/Fedora

* Nagios and the plugins will be installed underneath /usr/local/nagios
* Nagios will be configured to monitor a few aspects of your local system (CPU load, disk usage, etc.)
* The Nagios web interface will be accessible at http://localhost/nagios/

Prerequisites

Make sure that the following packages are installed

    * Apache
    * PHP
    * GCC compiler
    * GD development libraries

yum install httpd php

yum install gcc glibc glibc-common

yum install gd gd-devel

Create a new nagios user account and give it a password

/usr/sbin/useradd -m nagios

passwd nagios

Create a new nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.

/usr/sbin/groupadd nagcmd

/usr/sbin/usermod -a -G nagcmd nagios

/usr/sbin/usermod -a -G nagcmd apache

Download Nagios and the Plugins

http://www.nagios.org/download/

Compile and Install Nagios

Extract the Nagios source code tarball.
tar xzf nagios-3.2.3.tar.gz

cd nagios-3.2.3

Run the Nagios configure script, passing the name of the group created earlier
./configure --with-command-group=nagcmd

Compile the Nagios source code.

make all

Install binaries, init script, sample config files and set permissions on the external command directory.

make install

make install-init

make install-config

make install-commandmode

Customize Configuration

vi /usr/local/nagios/etc/objects/contacts.cfg

Configure the Web Interface

Install the Nagios web config file in the Apache conf.d directory.

make install-webconf


Create a nagiosadmin account for logging into the Nagios web interface. Remember the password you assign to this account – you’ll need it later.

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


Restart Apache to make the new settings take effect.

service httpd restart

Compile and Install the Nagios Plugins

Extract the Nagios plugins source code tarball.

cd ~/downloads

tar xzf nagios-plugins-1.X.tar.gz

cd nagios-plugins-1.X.

Compile and install the plugins.

./configure --with-nagios-user=nagios --with-nagios-group=nagios

make

make install

Start Nagios

Add Nagios to the list of system services and have it automatically start when the system boots.

chkconfig --add nagios

chkconfig nagios on

Verify the sample Nagios configuration files.

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

If there are no errors, start Nagios.

service nagios start

Modify SELinux Settings

See if SELinux is in Enforcing mode.

getenforce

Put SELinux into Permissive mode.

setenforce 0

To make this change permanent, you’ll have to modify the settings in /etc/selinux/config and reboot.

Login to the Web Interface

Access the Nagios web interface at the URL below, prompted for the username (nagiosadmin) and password you specified earlier.

http://localhost/nagios/







Reference:- http://cuongk6t.wordpress.com/2011/06/07/how-to-install-nagios-on-centos-6-or-fedora/



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