Nagios : Install2016/01/17

	Install Nagios which is an enterprise open source monitoring system.
[1]	Install and start Apache httpd, refer to here.
[2]	Install PHP, refer to here.
[3]	Install Nagios. Also Install basic plugins to monitor nagios server itself.

root@dlp:~#

apt-get -y install nagios3 nagios-plugins-basic

[4]	Configure Nagios.

root@dlp:~#

vi /etc/nagios3/nagios.cfg

# line 145: change

check_external_commands=

root@dlp:~#

vi /etc/nagios3/apache2.conf

# line 37: change access permission

Allow From

localhost 10.0.0.0/24

# change admin password

root@dlp:~#

htpasswd /etc/nagios3/htpasswd.users nagiosadmin

New password:

# set password

Re-type new password:
Updating password for user nagiosadmin

root@dlp:~#

/etc/init.d/nagios3 restart

* Restarting nagios3 monitoring daemon nagios3
...done.
root@dlp:~#

/etc/init.d/apache2 restart

* Restarting web server apache2
...done.

[5]	Access to the "http://(Nagios server's hostname or IP address)/nagios3/" from a client which is in the network allowed by Nagios server and authenticate with the Nagios admin user "nagiosadmin" to login.

[6]	After successing authentication, the Nagios admin site is displayed.

[7]	It's possible to view system status to click "Tactical Overview" and so on.

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