CentosLinuxMonitoring

Installing Nagios-3.4 in CentOS 6.3

Nagios is an opensource software used for network and infrastructure monitoring. Nagios will monitor servers, switches, applications and services. It alerts the System Administrator when something went wrong and also alerts back when the issues has been rectified.

View also: How to Enable EPEL Repository for RHEL/CentOS 6/5

yum install nagios nagios-devel nagios-plugins* gd gd-devel httpd php gcc glibc glibc-common

Bydefualt on doing yum install nagios, in cgi.cfg file, authorized user name nagiosadmin is mentioned and for htpasswd file /etc/nagios/passwd file is used.So for easy steps I am using the same name.

# htpasswd -c /etc/nagios/passwd nagiosadmin

Check the below given values in /etc/nagios/cgi.cfg

nano /etc/nagios/cgi.cfg
# AUTHENTICATION USAGE
use_authentication=1
# SYSTEM/PROCESS INFORMATION ACCESS
authorized_for_system_information=nagiosadmin
# CONFIGURATION INFORMATION ACCESS
authorized_for_configuration_information=nagiosadmin
# SYSTEM/PROCESS COMMAND ACCESS
authorized_for_system_commands=nagiosadmin
# GLOBAL HOST/SERVICE VIEW ACCESS
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
# GLOBAL HOST/SERVICE COMMAND ACCESS
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin

For provoding the access to nagiosadmin user in http, /etc/httpd/conf.d/nagios.conf file exist. Below is the nagios.conf configuration for nagios server.

cat /etc/http/conf.d/nagios.conf
# SAMPLE CONFIG SNIPPETS FOR APACHE WEB SERVER
# Last Modified: 11-26-2005
#
# This file contains examples of entries that need
# to be incorporated into your Apache web server
# configuration file. Customize the paths, etc. as
# needed to fit your system.

ScriptAlias /nagios/cgi-bin/ “/usr/lib/nagios/cgi-bin/”

# SSLRequireSSL
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
# Order deny,allow
# Deny from all
# Allow from 127.0.0.1
AuthName “Nagios Access”
AuthType Basic
AuthUserFile /etc/nagios/passwd
Require valid-user

Alias /nagios “/usr/share/nagios/html”

# SSLRequireSSL
Options None
AllowOverride None
Order allow,deny
Allow from all
# Order deny,allow
# Deny from all
Allow from 127.0.0.1
AuthName “Nagios Access”
AuthType Basic
AuthUserFile /etc/nagios/passwd
Require valid-user

Start the httpd and nagios /etc/init.d/httpd start /etc/init.d/nagios start [warn]Note: SELINUX and IPTABLE are disabled.[/warn] Access the nagios server by http://nagios_server_ip-address/nagios Give the username = nagiosadmin and password which you have given to nagiosadmin user.

Screenshot from 2013-04-13 23:02:47

Screenshot from 2013-04-13 23:05:41

View also: Adding clients to Nagios server

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