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Install Nagios 4.3.4 on Ubutu 14.04

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Nagios is the most widely used open source monitoring tools which help us to monitor the services and application that run’s on Windows, Linux, Routers and other network devices. With the help of Nagios, you can monitor basic services and attributes.

We can access the Nagios using web interface coming with the bundle, but configuration needs to be done on the file level.

Services List

This Tutorial describes how you can monitor “private” services and attributes of Linux/UNIX servers, such as:

Attributes

  • CPU load
  • Memory usage
  • Disk usage
  • Logged in users
  • Running processes
  • etc.

Private Services

  • HTTP
  • FTP
  • SSH
  • SMTP
  • etc

Install Nagios 4.3.4 on Ubuntu 16.04

Switch to the root user.

sudo su -

Install the dependencies for Nagios 4.

apt-get update
apt-get install build-essential apache2 php5 openssl perl make php5-gd libgd2-xpm-dev libapache2-mod-php5 libperl-dev libssl-dev daemon wget apache2-utils unzip

Create nagios user and nagcmd group (allowing the external commands to be executed through the web interface), add the nagios and apache user to the part of the nagcmd group.

useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd www-data

Download latest Nagios Core.

cd /tmp/
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.4.tar.gz
tar -zxvf nagios-4.3.4.tar.gz
cd /tmp/nagios-4.3.4/

Compile and Install Nagios.

./configure --with-nagios-group=nagios --with-command-group=nagcmd --with-httpd_conf=/etc/apache2/sites-enabled/
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

Configure Nagios

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

Change the Email address field to receive the notification.

define contact{
        contact_name                    nagiosadmin             ; Short name of user
        use                             generic-contact         ; Inherit default values from generic-contact template (defined above)
        alias                           Nagios Admin            ; Full name of user

        email                           admin@itzgeek.local        ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
        }

Configure Web Interface:

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

Run the following command.

a2enmod cgi

Restart Apache to make the new settings take effect.

/etc/init.d/apache2 restart

Download and Install Nagios Plugins

Download Nagios Plugins to /tmp directory.

cd /tmp
wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar -zxvf /tmp/nagios-plugins-2.2.1.tar.gz
cd /tmp/nagios-plugins-2.2.1/

Compile and install the plugins.

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

Starting Nagios

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.

/etc/init.d/nagios start

Access Nagios Web Interface

Now access the Nagios web interface using the following URL. You’ll be prompted for the username (nagiosadmin) and password you specified earlier.

http://ip-address/nagios/
Install Nagios 4.3.4 on Ubutu 14.04 - Service Status
Install Nagios 4.3.4 on Ubutu 14.04 – Service Status

That’s All. Hope this helped you, please post your valuable comments below.

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Install Nagios 4.3.4 on Ubutu 14.04

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