Nagios Doc

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                                             NAGIOS DOC

 I have using RHEL and CentOS 6.4 64 Bit Machines
 
Step 1: Install Required Packages and Dependencies

We assume that you have fresh installed CentOS, Red hat or Fedora systems, So our first requirement is to
install Apache and PHP first. Use the following commands to complete it. You can find detailed LAMP setup instruction here.

Install Packages:
# yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp xinetd openssl* -y

Start Services:
# service httpd start

Step 2: Setup User Accounts

Now create a new nagios user account and setup a password to this account

# useradd nagios
# passwd nagios

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=nagios
# 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


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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: Access Nagios 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]

http://127.0.0.1/nagios/

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INSTALL NRPE

# wget http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz

Extract the NRPE source code tarball.

# tar xzf nrpe-2.15.tar.gz


# cd nrpe-2.15

Compile the NRPE addon.

# ./configure

# make all

Install the NRPE plugin (for testing), daemon, and sample daemon config file.

# make install-plugin

# make install-daemon

# make install-daemon-config

Install the NRPE daemon as a service under xinetd.

# make install-xinetd

Edit the /etc/xinetd.d/nrpe file and add the IP address of the monitoring server to the only_from directive.

” only_from = 127.0.0.1 <nagios_ip_address> “

Add the following entry for the NRPE daemon to the /etc/services file.

” nrpe            5666/tcp                  # NRPE “

Restart the xinetd service.

# service xinetd restart

Its time to see if things are working properly…

Make sure the nrpe daemon is running under xinetd.

# netstat -at | grep nrpe

The output out this command should show something like this:

” tcp 0 0 *:nrpe *:* LISTEN “

Next, check to make sure the NRPE daemon is functioning properly. To do this, run the check_nrpe plugin thatwas installed for testing purposes.

# /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1

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