How to Configure Nagios monitoring server
Nagios is the most popular, open source, powerful monitoring system. It enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. With Nagios, you can monitor your remote hosts and their services remotely on a single window. It shows warnings and indicates if something goes wrong in your servers which eventually helps us to detect some problems before they occur. It helps us to reduce downtime and business losses. Nagios has capability of monitoring application, services, entire IT infrastructure.
Step 1: Prerequisites
Firstly install all the required libraries that are dependent on nagios installation:
# yum install -y httpd php gcc glibc glibc-common gd gd-devel make net-snmp
# service httpd start
Step 2: Create User Accounts & group
Now create a new nagios user account and setup a password to this account
# useradd nagios # passwd nagios
Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.
# groupadd nagcmd # usermod -a -G nagcmd nagios # usermod -a -G nagcmd apache
Step 3: Install Nagios Core Service
After installing required dependencies and adding user accounts. Lets start with Nagios core installation. Download latest nagios core service from official site.
# cd /opt/ # wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz # tar xzf nagios-4.0.8.tar.gz # cd nagios-4.0.8 # ./configure --with-command-group=nagcmd # make all # make install # make install-init # make install-config # make install-commandmode
Now use below command to setup apache configuration for Nagios installation.
# make install-webconf
Step 4: Configure Apache Authentication
We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.
# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Now restart Apache service to make the new settings take effect.
# service httpd restart
Step 5: Install Nagios Plugins
After installing and configuring Nagios core service, Download latest nagios-plugins source and install using following commands.
# cd /opt # wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz # tar xzf nagios-plugins-2.0.3.tar.gz # cd nagios-plugins-2.0.3
Now compile and install nagios plugins
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios # make # make install
Step 6: Verify and Start Nagios
Use the following commands to verify nagios install and start nagios core service.
# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg # service nagios start
Also configure nagios service to start on system start
# chkconfig --add nagios # chkconfig nagios on
Step 7: Install Centreon
Use the following commands to install Centreon.
# cd /usr/local/src # wget http://download.centreon.com/centreon/centreon-2.3.8.tar.gz # tar -zxf centreon-2.3.8.tar.gz # cd centreon-2.3.8 # ./install.sh -i
Step 8: Test in Web Browser
Nagios creates its own apache configuration file /etc/httpd/conf.d/nagios.conf. There are no need to make any changes to it. Simply open below url in browser.
[change domain name with your domain or ip]