Ubuntu 16.04
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Nagios : Install
Install Nagios which is an enterprise open source monitoring system.
[3] Install Nagios.
Also Install basic plugins to monitor nagios server itself.
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.
vi /etc/nagios3/nagios.cfg
# line 145: change

vi /etc/nagios3/apache2.conf
# line 40: change access permission

Allow From All
Allow From localhost
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

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

chmod 750 /var/lib/nagios3/rw

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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