CentOS 7, Linux, Nagios

Install Nagios 4.0.4 on Centos 7

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For RHEL/CentOS users:

#yum install -y wget httpd php gcc glibc glibc-common gd gd-devel make net-snmp
#yum install   httpd php  gd gd-devel gcc glibc glibc-common openssl perl perl-devel makesasa

Download Nagios Core and Nagios Plugins Tarballs
For all systems, run the following commands in your terminal:

cd /tmp
#wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.4.tar.gz
#wget http://nagios-plugins.org/download/nagios-plugins-2.0.tar.gz

This will download Nagios Core, and it’s required plugins.
Adding the Nagios User and Group
Next add the appropriate user and group for the Nagios process to run:

#useradd nagios
#groupadd nagcmd
#usermod -a -G nagcmd nagios

Nagios Core Installatiom

#tar zxvf nagios-4.0.4.tar.gz
#tar zxvf nagios-plugins-2.0.tar.gz

Change to the new Nagios directory and install the packages:

#cd nagios-4.0.4
#./configure --with-command-group=nagcmd
#make all
#make install
#make install-init
#make install-config
#make install-commandmode
#make install-webconf
#cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
#chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
#/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
#/etc/init.d/nagios start

For RHEL/CentOS users:

#/etc/init.d/httpd start
#systemctl start httpd

Create a Default User for Web Access.
Add a default user for Web Interface Access:

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

Nagios Plugin Installation

#cd /tmp/nagios-plugins-2.0
#./configure --with-nagios-user=nagios --with-nagios-group=nagios
#make
#make install

Nagios Service Setup
The following commands will register the Nagios daemon to be run upon system startup.

chkconfig --add nagios
chkconfig --level 35 nagios on
chkconfig --add httpd
chkconfig --level 35 httpd on

Nagios Web Interface
After correctly following the procedures you should now
be able to access your Nagios Core installation from a
web browser.
Simply use the following:
http://<your.nagios.server.ip>/nagios
And log in with the credentials you chose when adding
the nagiosadmin user to the htpasswd.users file.
Finishing

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