NAGIOS is a system and network monitoring application that watches host and services that
we specify as well as alerting when finds any error.
NAGIOS is implemented by using SNMP protocol, so which ever devices support SNMP we can
monitor that device using NAGIOS.
NAGIOS can do following things
1.Monitor wide range of hosts like Servers,Switches,Routers etc.
2.Monitor network services (Like : SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH.)
3.Monitor Host resources (Processor load, Running processes, Disk usage, System logs, etc)
4.Monitor Host environments(Temperature, Alarms etc).
Can alert you through e-mail, SMS, Pager etc.
NAGIOS can not do Monitoring of Bandwidth utilization in network.
This guide is intended to provide you with simple instructions on how to install Nagios from source (code) on
Fedora and have it monitoring your local machine inside of 20 minutes. No advanced installation options
are discussed here – just the basics that will work for 95% of users who want to get started.
During portions of the installation you’ll need to have root access to your machine.
Make sure you’ve installed the following packages on your Fedora installation before continuing.
  • Apache
  • PHP
  • GCC compiler
  • GD development libraries
You can use yum to install these packages by running the following commands (as root):
yum install httpd php 

yum install gcc glibc glibc-common

yum install gd gd-devel

1) Create Account Information
Become the root user.
su -l
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

2) Download Nagios and the Plugins

Create a directory for storing the downloads.

mkdir ~/downloads

cd ~/downloads

Download the source code tarballs of both Nagios and the Nagios plugins (visit http://www.nagios.org/download/
for links to the latest versions). These directions were tested with Nagios 3.1.1 and Nagios Plugins 1.4.11.
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.3.tar.gz
wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.11.tar.gz
3) Compile and Install Nagios
Extract the Nagios source code tarball.
cd ~/downloads
tar xzf nagios-3.2.3.tar.gz
cd nagios-3.2.3

Run the Nagios configure script, passing the name of the group you created earlier like so:
./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
Don’t start Nagios yet – there’s still more that needs to be done…
4) Customize Configuration
Sample configuration files have now been installed in the /usr/local/nagios/etc directory. These sample files should work fine for getting started with Nagios. You’ll need to make just one change before you proceed…
Edit the /usr/local/nagios/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you’d like to use for receiving alerts.
vi /usr/local/nagios/etc/objects/contacts.cfg
5) 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

Note: Consider implementing the ehanced CGI security measures described here to ensure that your web authentication credentials are not compromised.

6) Compile and Install the Nagios Plugins

Extract the Nagios plugins source code tarball.
cd ~/downloads

tar xzf nagios-plugins-1.4.11.tar.gz

cd nagios-plugins-1.4.11

Compile and install the plugins.

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


make install

7) 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

8) Modify SELinux Settings

Fedora ships with SELinux (Security Enhanced Linux) installed and in Enforcing mode by default. This can result in “Internal Server Error” messages when you attempt to access the Nagios CGIs.

See if SELinux is in Enforcing mode.


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.

Instead of disabling SELinux or setting it to permissive mode, you can use the following command to run the CGIs under SELinux enforcing/targeted mode:

chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/

chcon -R -t httpd_sys_content_t /usr/local/nagios/share/

9) Login to the Web Interface

You should now be able to access the Nagios web interface at the URL below. You’ll be prompted for the username (nagiosadmin) and password you specified earlier.


Click on the “Service Detail” navbar link to see details of what’s being monitored on your local machine. It will take a few minutes for Nagios to check all the services associated with your machine, as the checks are spread out over time.


8 Responses to “N.A.G.I.O.S”

  1. Navin July 1, 2010 at 1:28 pm #

    Hi Thanks for the information you have shared some really good information, Can you help in adding of devices to the monitoring.

  2. pimpmyhost August 13, 2010 at 1:51 pm #

    Do you have any PHP script to add websites to Nagios for monitoring?


  3. Amit Honrao January 5, 2011 at 9:52 pm #

    Hi Vishal really nice information….. you are really guru keep it up 🙂

  4. shaps April 11, 2011 at 1:39 pm #

    i followed this tuorials and it worked fine for me
    thank you very much i appreciate a lot

    • lalit February 19, 2013 at 10:55 am #

      hi its gud but i didnt implement yet,hope i will do 100% error free.
      thanks and its really helpful

  5. hemanth August 23, 2013 at 12:40 pm #

    guruji can u help me ” what is veritas software and it’s purpose “please explain in detailed manner.

    • hemanth August 24, 2013 at 8:12 am #

      guruji i am not able to execute below command:
      #make install-webconf
      i am getting some error while executing this command:
      “make: *** No rule to make target `install-webconf’. Stop.”
      please help me and get me out this problem.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: