Nagios : Install2016/06/08

	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

# set admin password for Nagios Web admin console
 +------------------------+ Configuring nagios3-cgi +------------------------+
 | Please provide the password to be created with the "nagiosadmin" user.    |
 |                                                                           |
 | This is the username and password you will use to log in to your nagios   |
 | installation after configuration is complete.  If you do not provide a    |
 | password, you will have to configure access to nagios yourself.           |
 |                                                                           |
 | Nagios web administration password:                                       |
 |                                                                           |
 | ********_________________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+

[4]	Configure Nagios.

root@dlp:~#

vi /etc/nagios3/nagios.cfg

# line 145: change

check_external_commands=

root@dlp:~#

vi /etc/nagios3/apache2.conf

# line 40: change access permission

Allow From All

Allow From localhost 10.0.0.0/24

root@dlp:~#

vi /etc/init.d/nagios3

# line 150: change like follows

if check_config; then
    start_daemon -n $NICENESS -p $THEPIDFILE $DAEMON -d $NAGIOSCFG
    chmod o+rw /var/lib/nagios3/rw/nagios.cmd

root@dlp:~#

vi /etc/nagios3/conf.d/localhost_nagios2.cfg

# line 22: comment out and add

# all partitions are monitored by default but it's unnecessary all,

# so change to specific pertition to monitor (the example below specify root partition)

check_command check_all_disks!20%!10%

check_command check_disk!20%!10%!/

root@dlp:~#

chgrp -R www-data /var/lib/nagios3

root@dlp:~#

chmod 750 /var/lib/nagios3/rw

root@dlp:~#

systemctl restart nagios3 apache2

[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. (password is just the one you set during Nagios installation)

[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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