Nagios is a feature rich application and some of them are as below:
1. Monitoring of Network Services (like http, ftp, smtp, dns, ping, etc)
2. Monitoring of Host Resources (like CPU, RAM, HDD, etc.)
3. Monitoring of Environmental Factors
4. Users can design their own service checks
5. Sending e-notifications during faults or outage
6. Log rotation
7. Support for redundant monitoring hosts implementation
8. Access Web Interface
Installation on CentOS5
1. download the nagios by weget command
2.install the rpm by #rpm -ivh
or
yum would be your best friend in RedHat based distributions
login by root user and give the below command and wait for the magic :)
#yum install nagios nagios-plugins nagios-plugins-nrpe nagios-devel
Once done successfully you will find "nagios.conf" file in "conf.d" directory of apache.
create a user for nagios administration, you may not want to root user for administration. say the userName is nagiosadmin
pass the below command at root prompt:
#htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin
Now
Edit the below file:
"/etc/nagios/cgi.cfg" >> you can use vi or emacs or nano editor
make the below changes to this file
use_authentication=1
authorized_for_system_information=nagiosadmin
authorized_for_configuration_information=nagiosadmin
authorized_for_system_commands=nagiosadmin
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin
Now
You may want to take backup of of the "localhost.cfg" in "/etc/nagios" to "localhost.cfg.backupOriginal"
#cd /etc/nagios
#mv localhost.cfg localhost.cfg.backupOriginal
Now
Edit "nagios.cfg" by your choice of editor.
localhost.cfg.org
cfg_file=/etc/nagios/contactgroups.cfg
cfg_file=/etc/nagios/contacts.cfg
cfg_file=/etc/nagios/hostgroups.cfg
cfg_file=/etc/nagios/hosts.cfg
cfg_file=/etc/nagios/services.cfg
cfg_file=/etc/nagios/timeperiods.cfg
check_external_commands=1
command_check_interval=-1
Now
Create the config files as below:
#touch contactgroups.cfg contacts.cfg hostgroups.cfg hosts.cfg services.cfg timeperiods.cfg
#chown nagios.nagios contactgroups.cfg contacts.cfg hostgroups.cfg hosts.cfg services.cfg timeperiods.cfg
Now, you are free to customize these files as per your business requirement.
say for file:- /etc/nagios/timeperiods.cfg
________________________________________________________________
# '24x7' timeperiod definition
define timeperiod{
timeperiod_name 24x7
alias 24 Hours A Day, 7 Days A Week
sunday 00:00-24:00
monday 00:00-24:00
tuesday 00:00-24:00
wednesday 00:00-24:00
thursday 00:00-24:00
friday 00:00-24:00
saturday 00:00-24:00
}
# 'workhours' timeperiod definition
define timeperiod{
timeperiod_name workhours
alias "Normal" Working Hours
monday 08:00-17:00
tuesday 08:00-17:00
wednesday 08:00-17:00
thursday 08:00-17:00
friday 08:00-17:00
}
# 'nonworkhours' timeperiod definition
define timeperiod{
timeperiod_name after office hours
alias Non-Work Hours
sunday 00:00-24:00
monday 00:00-09:00,17:00-24:00
tuesday 00:00-09:00,17:00-24:00
wednesday 00:00-09:00,17:00-24:00
thursday 00:00-09:00,17:00-24:00
friday 00:00-09:00,17:00-24:00
saturday 00:00-24:00
}
# 'none' timeperiod definition
define timeperiod{
timeperiod_name none
alias None
}
_________________________________________________________
For File /etc/nagios/contacts.cfg
define contact{
contact_name MonitorAdmin
alias MonitorAdmin
service_notification_period 24x7
host_notification_period 24x7
service_notification_options c,r
host_notification_options d,r
service_notification_commands notify-by-email
host_notification_commands host-notify-by-email
email networkAlerts@YourComanyName.com
}
define contact{
contact_name NK
alias NK
service_notification_period workhours
host_notification_period workhours
service_notification_options c,r
host_notification_options d,r
service_notification_commands notify-by-email
host_notification_commands host-notify-by-email
email networkAlerts@YourCompanyName.com
}
__________________________________________________________________________
For File Name : /etc/nagios/contactgroups.cfg
define contactgroup{
contactgroup_name Monitor
alias Monitor
members MonitorAdmin,NK
}
__________________________________________________________________
Now
If you want to configure the hosts and hostgroups (optional) to be monitored in "/etc/nagios/hosts.cgi" and "/etc/nagios/hostgroups.cgi".
File:/etc/nagios/hosts.cfg
# Generic host definitions
define host{
name generic-host ; Generic template name
notifications_enabled 1 ; Host notifications are enabled
event_handler_enabled 1 ; Host event handler is enabled
flap_detection_enabled 1 ; Flap detection is enabled
process_perf_data 1 ; Process performance data
retain_status_information 1 ; Retain status information
retain_nonstatus_information 1 ; Retain non-status information
register 0 ; DONT REGISTER THIS DEFINITION
}
define host{
name Template1
use generic-host
check_command check-host-alive
max_check_attempts 5
notification_interval 5
notification_period 24x7
notification_options d,u,r
register 0
}
##### Begin Real Hosts #####
define host{
use Template1
host_name mail.yourComanyName.com
alias mail.yourCompanyName.com
address a.b.c.d
contact_groups Monitor
# notification_options d,r #overrides the basic-host option
}
_______________________________________________________________________
Now
File:/etc/nagios/hostgroups.cfg
define hostgroup{
hostgroup_name YourCompanyServers
alias YourCompanyServers
members mail.yourCompanyName.com
}
________________________________________________________________________
Its turn to configure the services now.
Per-defined services are in "/etc/nagios/commands.cfg"
Custom services are in "/etc/nagios/services.cfg"
File:/etc/nagios/services.cfg
define service{
name generic-service ; Generic service name
active_checks_enabled 1 ; Active service checks are enabled
passive_checks_enabled 1 ; Passive service checks are enabled/accepted
parallelize_check 1 ; Active service checks should be parallelized
obsess_over_service 1 ; We should obsess over this service
check_freshness 0 ; Default is to NOT check service 'freshness'
notifications_enabled 1 ; Service notifications are enabled
event_handler_enabled 1 ; Service event handler is enabled
flap_detection_enabled 1 ; Flap detection is enabled
process_perf_data 1 ; Process performance data
retain_status_information 1 ; Retain status information
retain_nonstatus_information 1 ; Retain non-status information
register 0 ; DONT REGISTER THIS DEFINITION
}
# Generic for all services
define service{
use generic-service
name basic-service
is_volatile 0
check_period 24x7
max_check_attempts 5
normal_check_interval 1
retry_check_interval 3
notification_interval 0
notification_period none
register 0
}
define service{
use basic-service
name ping-service
notification_options n
check_command check_ping!1000.0,20%!2000.0,60%
register 0
}
define service{
use basic-service
name www-service
notification_options n
check_command check_http
register 0
}
define service{
use basic-service
name mail-service
notification_options n
check_command check_smtp
register 0
}
define service{
use ping-service
service_description PING
contact_groups Monitor
hostgroup_name yourCompanyServers
# host_name yourHostClient
}
define service{
use mail-service
service_description MAIL
contact_groups Monitor
hostgroup_name yourCompanyServers
# host_name yourHostClient
}
define service{
use www-service
service_description WWW
contact_groups Monitor
hostgroup_name yourCompanyServers
# host_name yourHostClient
}
___________________________________________________________________________
Now
We have used check_ping, check_http and check_smtp commands to monitor servers under yourComanyServers group.
Groups are helpful if you may want to monitor multiple servers.
In this configuration example, we could have used host_name parameter and there should have been no need to configure hostgroups.
Okie, Now everything is setup and you can make a final testing by using below command to get similar output.
cross your fingers :)
#nagios -v nagios.cfg
Nagios 2.10
Copyright (c) 1999-2007 Ethan Galstad (http://www.nagios.org)
Last Modified: 10-21-2007
License: GPL
Reading configuration data...
Running pre-flight check on configuration data...
If you see any error check and fix them.....
Now the last step
Run the service
#/etc/init.d/nagios start
Want to see the output in web browser
http://NAGIOS_SERVER_IP/nagios
huh....Enjoy the Flight......
Need more info visit For more information: http://nagios.sourceforge.net/docs/2_0/toc.html
Nice Post
ReplyDelete