Nagios : Install2015/02/23

	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.

# install from EPEL

[root@dlp ~]#

yum --enablerepo=epel -y install nagios nagios-plugins-{ping,disk,users,procs,load,swap,ssh,http}

[4]	Configure Nagios.

[root@dlp ~]#

vi /etc/httpd/conf.d/nagios.conf

# line 15-19, change settings to set access permissionlike follows ( set for line 32-36, too )

Order allow,deny

Allow from all
Order deny,allow
Deny from all
Allow from 127.0.0.1

10.0.0.0/24

# add nagios admin user

[root@dlp ~]#

htpasswd /etc/nagios/passwd nagiosadmin

New password:

# set any password

Re-type new password:
Adding password for user nagiosadmin

[root@dlp ~]#

/etc/rc.d/init.d/nagios start

Starting nagios: done.
[root@dlp ~]#

/etc/rc.d/init.d/httpd restart

Stopping httpd:

[ OK ]

Starting httpd:

[ OK ]

[root@dlp ~]#

chkconfig nagios on

[5]	Access to the "http://(Nagios server's hostname or IP address)/nagios/" 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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