Free RAM

 

Nagios

 

How to configure NAGIOS Monitoring server on Ubuntu

September 3, 2010 by: Qasim Ali

Please run these commands on your server
apt-get update
apt-get upgrade

Now installing NAGIOS

apt-get install nagios3

When asked the Postfix configuration then press ENTER and select the Internet Site and press OK.

System mail name: Type your Domain Name and press OK

Type: Nagios Administration password

Default username is “nagiosadmin” if you like changed the admin username so follow me:

vi /etc/nagios3/cgi.cfg
:% s/nagiosadmin/yourselectedname/g

And affected are 7 lines

cd /etc/nagios3/

Run this command for create password
sudo htpasswd -m htpasswd.users yourusername

Now restart the NAGIOS
/etc/init.d/nagios3 restart

Now open your web-browser and enter the following address
http://domain-name or server-ip/nagios3

Add contact email address on this setup for receiving any warring email, so follow me
This file here is the contact details his already setup only changed the Email address, removed the root@localhost and type your email address.
cd /etc/nagios3/conf.d
sudo vim contacts_nagios2.cfg

Now, you are monitoring Windows machines, Linux/Unix machines, Network Devices and etc…

Open the following file…

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

Add your machine information for example

define host{
use                        generic-host            ; Name of host template to use
host_name        your-host-name
alias                     your-host-name
address              your-host-IP
}

Add services you want to monitor like Current Load, Current Users, Disk Space, PING, Web Service, SSH, Total Processes and etc…

Add these lines bottom of following file…

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

# Define a service to check the disk space of the root partition
# on the local machine.  Warning if < 20% free, critical if
# < 10% free space on partition.

define service{
use                                      generic-service         ; Name of service template to use
host_name                       your-host-name
service_description    Disk Space
check_command          check_all_disks!20%!10%
}

# Define a service to check the number of currently logged in
# users on the local machine.  Warning if > 20 users, critical
# if > 50 users.

define service{
use                                              generic-service         ; Name of service template to use
host_name                              your-host-name
service_description             Current Users
check_command                   check_users!20!50
}

# Define a service to check the number of currently running procs
# on the local machine.  Warning if > 250 processes, critical if
# > 400 processes.

define service{
use                                       generic-service         ; Name of service template to use
host_name                       your-host-name
service_description     Total Processes
check_command            check_procs!250!400
}

# Define a service to check the load on the local machine.

define service{
use                                      generic-service         ; Name of service template to use
host_name                       your-host-name
service_description     Current Load
check_command           check_load!5.0!4.0!3.0!10.0!6.0!4.0
}

# check that ping-only hosts are up

define service {
host_name                        your-host-name
service_description      PING
check_command            check_ping!100.0,20%!500.0,60%
use                                         generic-service
notification_interval           0 ; set > 0 if you want to be renotified
}

# check that web services are running

define service {
host_name                              your-host-name
service_description            HTTP
check_command                  check_http
use                                              generic-service
notification_interval           0 ; set > 0 if you want to be renotified
}

# check that ssh services are running

define service {
host_name                               your-host-name
service_description             SSH
check_command                   check_ssh
use                                                generic-service
notification_interval           0 ; set > 0 if you want to be renotified
}

Now open your web-browser and enter the following address
http://domain-name or server-ip/nagios3

please let us know in case of any problem…

 

From http://www.linuxgurru.com/2010/09/how-to-configure-nagios-monitoring-server-on-ubuntu/