Hack The Sec-Leading Resource Of Linux Tutorial: Nagios

How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

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Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 
Icinga is an open source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009. 
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtbWp0y0o_B3MQiZ4bjwJQ4f43t1N5Cu4j8oHUv4wcD_bkuIBuA-wAMchSWbUMTNe1SgmJUhspgJq0dsb2kp8QLI4CnMkGSp9dFA6V4R4yYEg7gWQd3NeqgPOiQ_25aaQsXopeXhALg_wf/s1600/icinga_logo.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtbWp0y0o_B3MQiZ4bjwJQ4f43t1N5Cu4j8oHUv4wcD_bkuIBuA-wAMchSWbUMTNe1SgmJUhspgJq0dsb2kp8QLI4CnMkGSp9dFA6V4R4yYEg7gWQd3NeqgPOiQ_25aaQsXopeXhALg_wf/s1600/icinga_logo.png" /></a></div>
 
Icinga is attempting to get past perceived short-comings in Nagios' development process, as well as adding new features such as a modern Web 2.0 style user interface, additional database connectors (for MySQL, Oracle, and PostgreSQL), and a REST API that lets administrators integrate numerous extensions without complicated modification of the Icinga core. 
Before we go ahead, lets install the required packages for Icinga. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># yum -y install wget httpd mod_ssl gd gd-devel mariadb-server php-mysql php-xmlrpc gcc mariadb libdbi libdbi-devel libdbi-drivers libdbi-dbd-mysql</pre>
Disable SELinux. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config</pre>
Reboot once done. 
 
Create icinga user and icinga-cmd group (allowing the external commands to be executed through the web interface) , add  icinga and apache user to the part of icinga-cmd group. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># useradd icinga
# groupadd icinga-cmd
# usermod -a -G icinga-cmd icinga
# usermod -a -G icinga-cmd apache</pre>
Download latest Icinga source tarball. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp/
# wget http://downloads.sourceforge.net/project/icinga/icinga/1.10.1/icinga-1.10.1.tar.gz
# tar -zxvf /tmp/icinga-1.10.1.tar.gz
# cd /tmp/icinga-1.10.1</pre>
Compile and Install Icinga: 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --with-command-group=icinga-cmd --enable-idoutils
# make all
# make install
# make install-init
# make install-config
# make install-commandmode
# make install-webconf
# make install-idoutils</pre>
Configure Icinga: 
 
Sample configuration files have now been installed in the /usr/local/icinga/etc/ directory. These sample files should work fine for getting started with Icinga. You’ll need to make just one change before you proceed. Edit the /usr/local/icinga/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. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /usr/local/icinga/etc/objects/contacts.cfg</pre>
Change the Email address field to receive the notification. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@localhost</pre>
to 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@hackthesec.co.in</pre>
Move sample idoutils configuration files to Icinga base directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /usr/local/icinga/etc/
# mv idomod.cfg-sample idomod.cfg
# mv ido2db.cfg-sample ido2db.cfg
# cd modules/
# mv idoutils.cfg-sample idoutils.cfg</pre>
Create database for idoutils: 
 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># systemctl start mariadb.service
# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE icinga;
MariaDB [(none)]> GRANT USAGE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0;
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> quit</pre>
Import Database. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># mysql -u root -p icinga < /tmp/icinga 1.10.1/module/idoutils/db/mysql/mysql.sql</pre>
Configure Web Interface: 
 
Create a icingaadmin account for logging into the Icinga web interface. Remember the password that you assign to this user – you’ll need it later. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># htpasswd -c /usr/local/icinga/etc/htpasswd.users icingaadmin</pre>
Restart Apache to make the new settings take effect. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">systemctl restart httpd.service</pre>
Download and Install Nagios Plugins: 
 
Download Nagios Plugins to /tmp directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar -zxvf /tmp/nagios-plugins-2.0.3.tar.gz
# cd /tmp/nagios-plugins-2.0.3/</pre>
Compile and install the plugins. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --prefix=/usr/local/icinga --with-cgiurl=/icinga/cgi-bin --with-nagios-user=icinga --with-nagios-group=icinga
# make
# make install</pre>
Starting Icinga: 
 
Verify the sample Icinga configuration files. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /usr/local/icinga/bin/icinga -v /usr/local/icinga/etc/icinga.cfg</pre>
If there are no errors, start Nagios and Idoutils. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /etc/init.d/icinga start
# /etc/init.d/ido2db start</pre>
Start Icinga and Idoutils on system startup. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># chkconfig ido2db on
# chkconfig icinga on
# systemctl enable httpd.service
# systemctl enable mariadb.service</pre>
Access Web Interface: 
 
Now access Icinga web interface using the following URL. You'll be prompted for the username (icingaadmin) and password you specified earlier. 
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0PhYekAkOCAtvydkM0jNq7qOMIsvmjx1BVH4fv3VrMj0xK6rFZdrRYxsruVzHDPwBkLcMhEfT31yBN69Tgc7PF5RneGSkbmtrKT50LUfahzo-_gxItZknEjr3zf_2fZwnTLeNGKe-fwNA/s1600/CentOS-7-Icinga-localhost-Service-details_hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0PhYekAkOCAtvydkM0jNq7qOMIsvmjx1BVH4fv3VrMj0xK6rFZdrRYxsruVzHDPwBkLcMhEfT31yBN69Tgc7PF5RneGSkbmtrKT50LUfahzo-_gxItZknEjr3zf_2fZwnTLeNGKe-fwNA/s1600/CentOS-7-Icinga-localhost-Service-details_hackthesec.co.in.jpg" /></a></div>
 
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a> 
 
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How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 Icinga is an open source computer system and network monitoring application. It was orig...

How to install Nagios 4.1.1 On RHEL/CentOS 6.x/5.x and Fedora 19/18/17

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Installing Nagios 4.1.1 and Nagios Plugin 1.5<div>
<div>
Nagios a free and open computer-software application, monitors systems, networks and infrastructure. Nagios offers monitoring and alerting services for servers, switches, applications and services. It alerts users when things go wrong and alerts them a second time when the problem has been resolved.</div>
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 </div>
<div>
Nagios was originally designed to run under Linux, but it also runs well on other Unix variants. It is free software licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. 
<div style="text-align: justify;">
                          <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivthFS0dDQzLIMVYd6MNYZwXaftIcoDwYN3bc_QczbT3tAZ-zZl7kKTud-nNDEdLMHK366m-jfAcf-M5hfoK-RL_lEsfWaFXCLCnZIElBD8-Czso-mrj92OS5LhnQcRBOjSBUsBZsKIK5p/s1600/nagios-core-www.hackthesec.co.in.gif" imageanchor="1" style="background-color: white; font-family: 'roboto condensed', arial, sans-serif; font-size: 18px; line-height: 28.8px; margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivthFS0dDQzLIMVYd6MNYZwXaftIcoDwYN3bc_QczbT3tAZ-zZl7kKTud-nNDEdLMHK366m-jfAcf-M5hfoK-RL_lEsfWaFXCLCnZIElBD8-Czso-mrj92OS5LhnQcRBOjSBUsBZsKIK5p/s1600/nagios-core-www.hackthesec.co.in.gif" /></a></div>
<div style="font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
With Nagios you can:</div>
<div style="text-align: justify;">
</div>
<div style="font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">
<ul style="font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<li>Monitor your entire IT infrastructure</li>
<li>Spot problems before they occur</li>
<li>Know immediately when problems arise</li>
<li>Share availability data with stakeholders</li>
<li>Detect security breaches</li>
<li>Plan and budget for IT upgrades</li>
<li>Reduce downtime and business losses</li>
</ul>
<div>
<div style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;">
Step 1: Install Required Dependencies</div>
<div>
<div style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;">
Install Apache, PHP and some libraries like gcc, glibc, glibc-common and GD libraries and its development libraries before installing Nagios 4.1.1 with source. From Yum Library.</div>
<div style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;">
</div>
<pre style="background-attachment: scroll; background-color: #3c3c3c; background-image: none; background-position: 0px 0px; background-repeat: repeat; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); font-weight: bold; line-height: normal; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">yum install -y httpd php gcc glibc glibc-common gd gd-devel make net-snmp</pre>
<div style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;">
Step 2: Create Nagios User and Group</div>
<div style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;">
Create a new nagios user and nagcmd group account and set a password.</div>
<pre style="background-attachment: scroll; background-color: #3c3c3c; background-image: none; background-position: 0px 0px; background-repeat: repeat; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); font-weight: bold; line-height: normal; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# useradd nagios
[root@hackthesec ]# groupadd nagcmd</pre>
Next, add both the nagios user and the apache user to the nagcmd group. 
 
<pre style="background-attachment: scroll; background-color: #3c3c3c; background-image: none; background-position: 0px 0px; background-repeat: repeat; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); font-weight: bold; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# usermod -G nagcmd nagios
[root@hackthesec ]# usermod -G nagcmd apache</pre>
Step 3: Download Nagios Core 4.1.1 and Nagios Plugin 1.5 
Create a directory for your Nagios installation and all its future downloads. 
 
<pre style="background-attachment: scroll; background-color: #3c3c3c; background-image: none; background-position: 0px 0px; background-repeat: repeat; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); font-weight: bold; margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# mkdir /root/nagios
[root@hackthesec ]# cd /root/nagios</pre>
Now download latest Nagios Core 4.1.1 and Nagios plugins 1.5 packages with wget command. 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios~]# wget http://nchc.dl.sourceforge.net/project/nagios/nagios-4.x/nagios-4.1.1/nagios-4.1.1.tar.gz

[root@hackthesec nagios~]# wget https://www.nagios-plugins.org/download/nagios-plugins-1.5.tar.gz</pre>
Step 4: Extract Nagios Core and its Plugins 
We need to extract downloaded package with <a href="http://www.hackthesec.co.in/2016/02/unpacking-or-uncompressing-gz-files.html">tar command</a> as follows. 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios~]# tar –xvf nagios-4.1.1.tar.gz
[root@hackthesec nagios~]# tar –xvf nagios-plugins-1.5.tar.gz </pre>
<div>
When you extract these tarballs with tar command, two new folders will appear in that directory.</div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios ~]# ll
total 3712
drwxrwxr-x 18 root root 4099 Feb 24 03:28 nagios-4.1.1
-rw-r--r-- 1 root root 1695390 Feb 24 03:32 nagios-4.1.1.tar.gz
drwxr-xr-x 15 200 300 4099 Feb 24 03:40 nagios-plugins-1.5
-rw-r--r-- 1 root root 2428259 Feb 24 03:42 nagios-plugins-1.5.tar.gz </pre>
<div>
Configure Nagios Core </div>
We will configure Nagios Core and to do so we need to go to Nagios directory and run configure file and sample output. Please see below. 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios~]# cd nagios-4.1.1
[root@hackthesec nagios-4.1.1]# ./configure --with-command-group=nagcmd</pre>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">Nagios executable: nagios
 Nagios user/group: nagios,nagios
 Command user/group: nagios,nagcmd
 Event Broker: yes
 Install ${prefix}: /usr/local/nagios
 Install ${includedir}: /usr/local/nagios/include/nagios
 Lock file: ${prefix}/var/nagios.lock
 Check result directory: ${prefix}/var/spool/checkresults
 Init directory: /etc/rc.d/init.d
 Apache conf.d directory: /etc/httpd/conf.d
 Mail program: /bin/mail
 Host OS: linux-gnu

Web Interface Options:
 ------------------------
                 HTML URL:  http://localhost/nagios/
                  CGI URL:  http://localhost/nagios/cgi-bin/
 Traceroute (used by WAP):  /bin/traceroute

Review the options above for accuracy. If they look okay,
type 'make all' to compile the main program and CGIs.</pre>
We need to Compile and install all the binaries with make command and make install command will install all the needed libraries in your machine and sample output bellow 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1 ]# make all
[root@hackthesec nagios-4.1.1 ]# make install
</pre>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">*** Main program, CGIs and HTML files installed ***

You can continue with installing Nagios as follows (type 'make'
without any arguments for a list of all possible options):

make install-init
     - This installs the init script in /etc/rc.d/init.d

make install-commandmode
     - This installs and configures permissions on the
       directory for holding the external command file

make install-config
 - This installs sample config files in /usr/local/nagios/etc</pre>
<div>
Following command will install the init scripts for Nagios.</div>
<div>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1 ]# make install-init
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To make nagios work from command line we need to install command-mode.</div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1 ]# make install-commandmode
</pre>
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Next, install sample nagios files, please run following command. and sample output bellow..</div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1 ]# make install-config</pre>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc/objects
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/nagios.cfg /usr/local/nagios/etc/nagios.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/cgi.cfg /usr/local/nagios/etc/cgi.cfg
/usr/bin/install -c -b -m 660 -o nagios -g nagios sample-config/resource.cfg /usr/local/nagios/etc/resource.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/templates.cfg /usr/local/nagios/etc/objects/templates.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/commands.cfg /usr/local/nagios/etc/objects/commands.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/contacts.cfg /usr/local/nagios/etc/objects/contacts.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/timeperiods.cfg /usr/local/nagios/etc/objects/timeperiods.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/localhost.cfg /usr/local/nagios/etc/objects/localhost.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/windows.cfg /usr/local/nagios/etc/objects/windows.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/printer.cfg /usr/local/nagios/etc/objects/printer.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/switch.cfg /usr/local/nagios/etc/objects/switch.cfg

*** Config files installed ***

Remember, these are *SAMPLE* config files. You'll need to read
the documentation for more information on how to actually define
services, hosts, etc. to fit your particular needs.</pre>
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<div>
<div>
Step 5: Customizing Nagios Configuration</div>
</div>
Open the "contacts.cfg" file with your editor and set the email addressassociated with the nagiosadmin contact definition to receiving email alerts.Sample Output Bellow... 
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"># vi /usr/local/nagios/etc/objects/contacts.cfg</pre>
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<div style="font-family: 'Times New Roman'; line-height: normal;">
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">###############################################################################
###############################################################################
#
# CONTACTS
#
###############################################################################
###############################################################################

# Just one contact defined by default - the Nagios admin (that's you)
# This contact definition inherits a lot of default values from the 'generic-contact'
# template which is defined elsewhere.

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 hackthesec@hackthesec.co.in ; *** CHANGE THIS TO YOUR EMAIL ADDRESS **** }</pre>
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<div>
Step 6: Install and Configure Web Interface for Nagios</div>
<div>
We will configure Web Interface For Nagios with following command. The below command will Configure Web interface for Nagios and a web admin user will be created “nagiosadmin”.</div>
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1 ]# make install-webconf</pre>
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We will be creating a password for “nagiosadmin”. After executing this command, please provide a password twice and keep it remember because this password will be used when you login in the Nagios Web interface. 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios-4.1.1]# htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin</pre>
Restart Apache to make the new settings take effect. 
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# service httpd start (On RedHat / CentOS)
[root@hackthesec ]# systemctl start httpd.service (On Fedora)</pre>
Step 7: Compile and Install Nagios Plugin 
We have downloaded nagios plugins in /root/nagios, Go there and configure and install it. 
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios]# cd /root/nagios
[root@hackthesec nagios]# cd nagios-plugins-1.5
[root@hackthesec nagios]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
[root@hackthesec nagios]# make
[root@hackthesec nagios]# make install</pre>
Step 8: Verify Nagios Configuration Files 
Now we are all done with Nagios configuration and its time to verify it and to do so please insert following command.  
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<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec nagios]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg</pre>
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">/usr/bin/install -c -m 644 sample-config/httpd.conf /etc/httpd/conf.d/nagios.conf

*** Nagios/Apache conf file installed ***

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
...
...
Total Warnings: 0
Total Errors: 0</pre>
Step 9: Add Nagios Services to System Startup 
We need to add nagios and httpd with chkconfig command. 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# chkconfig --add nagios
[root@hackthesec ]# chkconfig --level 35 nagios on
[root@hackthesec ]# chkconfig --add httpd
[root@hackthesec ]# chkconfig --level 35 httpd on</pre>
Restart Nagios to make the new settings take effect. 
 
<pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;">[root@hackthesec ]# service nagios start (On RedHat / CentOS)
[root@hackthesec ]# systemctl start nagios.service (On Fedora)</pre>
Step 10: Login to the Nagios Web Interface 
Your nagios is ready to work, please open it in your browser with “http://Your-server-IP-address/nagios” or “http://FQDN/nagios” and Provide the username “nagiosadmin” and password. 
 
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