Showing posts with label Nagios. Show all posts
Showing posts with label Nagios. Show all posts

Saturday, August 23, 2014

Monitoring Windows Host Status from Nagios server

To monitor the windows machine from the nagios server we need first install the NSclient++ on windows machine host.

To download the NSclient++ in your windows machine use the below link

Link : http://nsclient.org/nscp/downloads

After downloading finished try to install the package in windows host




















We need change the configuration in NSclient++

Edit following file

C:\Program Files\NSClient++\NSC.ini


Enable following service which need to monitor

;  You will need to enable some of these for NSClient++ to work.
; ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
; *                                                               *
; * N O T I C E ! ! ! - Y O U   H A V E   T O   E D I T   T H I S *
; *                                                               *
; ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
FileLogger.dll
CheckSystem.dll
CheckDisk.dll
NSClientListener.dll
NRPEListener.dll
SysTray.dll
CheckEventLog.dll
;CheckHelpers.dll
;CheckWMI.dll
;
; RemoteConfiguration IS AN EXTREM EARLY IDEA SO DONT USE FOR PRODUCTION ENVIROMNEMTS!
;RemoteConfiguration.dll
; NSCA Agent is a new beta module use with care!
;NSCAAgent.dll
; LUA script module used to write your own "check deamon" (sort of) early beta.
;LUAScript.dll
; Script to check external scripts and/or internal aliases, early beta.
;CheckExternalScripts.dll
; Check other hosts through NRPE extreme beta and probably a bit dangerous! :)
;NRPEClient.dll

Enter the Nagios server IP address in allow host line and enable it.

[NSClient]
;# ALLOWED HOST ADDRESSES
;  This is a comma-delimited list of IP address of hosts that are allowed to talk to

NSClient deamon.
;  If you leave this blank the global version will be used instead.
allowed_hosts= 192.168.1.202
;

Enable port for NSclient++ in windows machine.

;# NSCLIENT PORT NUMBER
;  This is the port the NSClientListener.dll will listen to.
port=12489
;

After changing configuration, start the NSclient service.

path : start --> administrative tools ---> services ---> NSclientpp(nagios)


If your firewall in enable in windows machine then add the nsclient port 12489 in firewall which allow you to access the nagios server.


Switch back to Nagios  Server

Add the check_nt command in the commands.cfg configuration file.

[root@linuxstorages~ ]# vi /etc/nagios/objects/commands.cfg

Add in last line of file

# 'check_nt' command definition
define command{
        command_name    check_nt
        command_line    $USER1$/check_nt -H $HOSTADDRESS$ -p 12489 -v $ARG1$ $ARG2$
        }
:wq (save)


Edit the nagios configuration file nagios.cfg to enable the window configuration.

[root@linuxstorages~ ]# vi /etc/nagios/nagios.cfg

Line no 39 enable windows.cfg file

# Definitions for monitoring a Windows machine
cfg_file=/etc/nagios/objects/windows.cfg

:wq (save)

Add the window remote host configuration in windows.cfg file and you can add multiple windows host machine in this file, no need create separate file for each windows host machine.

[root@linuxstorages~ ]#vi /etc/nagios/objects/windows.cfg


define host{
        use             windows-server  ; Inherit default values from a template
        host_name       winserver-2     ; The name we're giving to this host
        alias           My Windows Server       ; A longer name associated with the host
        address         192.168.1.200     ; IP address of the hos

        }

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     NSClient++ Version
        check_command           check_nt!CLIENTVERSION
        }

# Create a service for monitoring the uptime of the server
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     Uptime
        check_command           check_nt!UPTIME
        }

# Create a service for monitoring CPU load
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     CPU Load
        check_command           check_nt!CPULOAD!-l 5,80,90
        }

# Create a service for monitoring memory usage
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     Memory Usage
        check_command           check_nt!MEMUSE!-w 80 -c 90
        }

# Create a service for monitoring C:\ disk usage
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     C:\ Drive Space
        check_command           check_nt!USEDDISKSPACE!-l c -w 80 -c 90
        }

# Create a service for monitoring the W3SVC service
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     W3SVC
        check_command           check_nt!SERVICESTATE!-d SHOWALL -l W3SVC
        }

# Create a service for monitoring the Explorer.exe process
# Change the host_name to match the name of the host you defined above

define service{
        use                     generic-service
        host_name               winserver-2
        service_description     Explorer
        check_command           check_nt!PROCSTATE!-d SHOWALL -l Explorer.exe
        }


After adding the windows host information restart the Nagios server.

[root@linuxstorages~ ]# /etc/init.d/nagios restart
Running configuration check...done.
Stopping nagios: done.
Starting nagios: done.

Check the Window host machine status in admin URL








Thursday, August 21, 2014

How to Setup Nagios & NREP in RHEL/CentOS - 6 Steps

Nagios is a powerful Open Source Monitoring tool that provides you with instant awareness of your organization's mission-critical IT infrastructure. Nagios allows you to detect and repair problems and mitigate future issues before they affect end-users and customers.

 We can monitor remote host and their services (HTTP, MYSQL, Disk Space etc) remotely. Its show’s warnings and alerts if something went wrong in remote servers, which will help us to detect the problem in server and find a solution for the issue which helps us to reduce the downtime of server.



Nagios will be installed in a server where we will monitor all our client machines and in client side we will install Nagios NRPE (Nagios Remote Plugin Executor) which will communicate with the Nagios server and send client machine status.

Step 1: Install Required Packages and Dependencies in Nagios Server

We need to install Apache, Php and supporting libraries file such as gcc, glibc, glibc-common, and GD libraries.


[root@linuxstorages ~]#yum install gd gd-devel gcc glibc glibc-common -y

To install nagios through yum we need to add EPEL repository in yum.

[root@linuxstorages ~]# wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

[root@linuxstorages ~]#rpm -ivh epel-release-6-8.noarch.rpm

Now install nagios via yum 

[root@linuxstorages ~]#yum install nagios* -y

Step 2 : Configure Nagios Server

Add the admin mail address in the nagios contact file to receive alerts from nagios server.

[root@linuxstorages ~] vi /etc/nagios/objects/contacts.cfg
#
# CONTACTS
#
###############################################################################
###############################################################################
# Just one contact defined by default - the Nagios admin (that's you)
# This contact definition inherits a lot of default values from the 'generic-contact'
# template which is defined elsewhere.

#define contact{
#        contact_name                    nagiosadmin             ; Short name of user
#        use                                    generic-contact         ; Inherit default values #from generic-contact template (defined above)
#        alias                                  Nagios Admin            ; Full name of user
#        email                                 nagios@localhost        ; <<***** CHANGE THIS TO #YOUR EMAIL ADDRESS ******
#        }
define contact{
        contact_name                    pravin_contact             ; Short name of user
        use                                    generic-contact         ; Inherit default values from generic-contact template (defined above)
        alias                                  Nagios Admin            ; Full name of user
        email                                 pravin@linuxstorages.com   ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
        }
:wq(save file)

To allow Nagios server admin link from particular ip address (192.168.1.54).


  [root@linuxstorages ~]# vi /etc/httpd/conf.d/nagios.conf

## Comment Lines 15 & 16 ##

#   Order allow,deny

#   Allow from all

 ## Uncomment and Change lines 17,18 & 19 as shown below ##

Order deny,allow

Deny from all

Allow from 127.0.0.1 192.168.1.54

:wq (save)

Now we can access Nagios admin link only from localhost and 192.168.1.54. 

Step 3 : Create User and password for Nagios Admin.


  [root@linuxstorages ~]#  htpasswd /etc/nagios/passwd nagiosadmin

New password:

Re-type new password:

Updating password for user nagiosadmin

Step 4 : Start Apache and Nagios service and make chkconfig(Service Start automatically on every boot). 

  [root@linuxstorages ~]# /etc/init.d/nagios start
 Starting nagios: done.

  [root@linuxstorages ~]#/etc/init.d/httpd start

 Starting httpd:                                            [  OK  ]

   [root@linuxstorages ~]#chkconfig nagios on
        

  [root@linuxstorages ~]#chkconfig httpd on 

Now access the Nagios admin link and enter user & password which created before.

Link : http://localhost/nagios 




Step 5 : Installing NRPE on Nagios Remote Host server’s 

NRPE  Nagios Remote Plugin Executor which allows you to remotely execute Nagios plugins on other Linux/Unix machines. This allows you to monitor remote machine metrics (disk usage, CPU load, etc.). NRPE can also communicate with some of the Windows agent addons, so you can execute scripts and check metrics on remote Windows machines as well.

[root@linuxstorages ~]# yum install nagios-plugins-all nrpe openssl

Configure nrpe configuration in remote host by adding Nagios server ipaddress.

 
[root@linuxstorages ~]# vi /etc/nagios/nrpe.cfg

[...]

## Line 81 - Add the Nagios server IP  and check_nrpe commands ##

allowed_hosts=127.0.0.1,192.168.1.54

##Line 210 ##

command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10

command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20

command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1

command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z

command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200

command[check_swap]=/usr/lib64/nagios/plugins/check_swap -w 20 -c 10

[...]

:wq (save)


Restart the nrpe service in remote host.

[root@linuxstorages ~]# service nrpe restart

[root@linuxstorages ~]# chkconfig nrpe on

Step 6 : Now switch back to Nagios server and edit below configuration file.


By default NRPE command wont be available in commands.cfg, to execute the in check_nrpe command in configuration file we need to add it in commands.cfg

[root@linuxstorages ~]# vi /etc/nagios/objects/commands.cfg

# add at the bottom

define command{

command_name   check_nrpe

command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$

}

:wq (save)


Now Change configuration in nagios.cfg

    [root@linuxstorages ~]# vi /etc/nagios/nagios.cfg

    and uncomment the following lines.

    ## Line 52 - Uncomment ##

    cfg_dir=/etc/nagios/servers

    :wq (save)


Create a directory called “servers” under “/etc/nagios/”.

[root@linuxstorages ~]# mkdir –p /etc/nagios/servers

Now create a configuration files for remote host server's in /etc/nagios/servers path.

[root@linuxstorages ~]#cd /etc/nagios/servers

    [root@linuxstorages ~]#vi client-server-1.cfg

     Check nrpe configuration file in remote client machine so that we can use same command

     in this file too.

               define host {
          
            use                                 linux-server
          
            host_name                        client-server1
          
            alias                            client-server1
          
            address                         192.168.1.101
    
     max_check_attempts              5
    
     check_period                    24x7
    
     notification_interval           30
    
     notification_period             24x7
    
     }
    

        define service {

                use                                   generic-service

                host_name                        client-server1

                service_description              PING

                check_command               check_ping!100.0,20%!500.0,60%

                }

        define service {

                use                                   generic-service

                host_name                        client-server1

                service_description             SSH

                check_command               check_ssh

                notifications_enabled            0

                }

        define service {

                use                                  generic-service

                host_name                        client-server1

                service_description           CPU Load

                check_command              check_nrpe!check_load

                }

        define service {

                use                                  generic-service

                host_name                        client-server1

                service_description          Login Users

                check_command               check_nrpe!check_users

                }

        define service {

                use                                  generic-service

                host_name                      client-server1

                service_description          Disk Usage

                check_command              check_nrpe!check_hda1

                }

        define service {

                use                                  generic-service

                host_name                       client-server1

                service_description           Total Process

                check_command              check_nrpe!check_total_procs

                }

        define service {

                use                                  generic-service

                host_name                        client-server1

                service_description           Swap Usage

                check_command             check_nrpe!check_swap

                }


same configuration should to be done for all remote host client machines.

Restart the Nagios server, after all configuration's done in both client and server side.

[root@linuxstorages ~]#/etc/init.d/nagios restart

Running configuration check...done.
Stopping nagios: done.
Starting nagios: done.

Now access the Nagios Monitoring Tool in Web Interface by using Nagios admin link and make sure services for remote host.


Nagios Host View



Nagios Service View

 

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