srijafavouriteblog: configuration steps on nagios monitoring server

configuration steps on nagios monitoring server

1. Verify check_nt command and windows-server template

Verify that the check_nt is enabled under /usr/local/nagios/etc/objects/commands.cfg

# 'check_nt' command definition

define command{

command_name    check_nt

command_line    $USER1$/check_nt -H $HOSTADDRESS$ -p 12489 -v $ARG1$ $ARG2$

Verify that the windows-server template is enabled under /usr/local/nagios/etc/objects/templates.cfg

# Windows host definition template - This is NOT a real host, just a template!

define host{

name                    windows-server  ; The name of this host template

use                     generic-host    ; Inherit default values from the generic-host template

check_period            24x7            ; By default, Windows servers are monitored round the clock

check_interval          5               ; Actively check the server every 5 minutes

retry_interval          1               ; Schedule host check retries at 1 minute intervals

max_check_attempts      10              ; Check each server 10 times (max)

check_command           check-host-alive        ; Default command to check if servers are "alive"

notification_period     24x7            ; Send notification out at any time - day or night

notification_interval   30              ; Resend notifications every 30 minutes

notification_options    d,r             ; Only send notifications for specific host states

contact_groups          admins          ; Notifications get sent to the admins by default

hostgroups              windows-servers ; Host groups that Windows servers should be a member of

register                0               ; DONT REGISTER THIS - ITS JUST A TEMPLATE

2. Uncomment windows.cfg in /usr/local/nagios/etc/nagios.cfg

# Definitions for monitoring a Windows machine

cfg_file=/usr/local/nagios/etc/objects/windows.cfg

3. Modify /usr/local/nagios/etc/objects/windows.cfg

By default a sample host definition for a windows server is given under windows.cfg, modify this to reflect the appropriate windows server that needs to be monitored through nagios.

# Define a host for the Windows machine we'll be monitoring

# Change the host_name, alias, and address to fit your situation

define host{

use             windows-server              ; Inherit default values from a template

host_name   remote-windows-host      ; The name we're giving to this host

alias            Remote Windows Host     ; A longer name associated with the host

address       192.168.1.4                   ; IP address of the remote windows host

4. Define windows services that should be monitored.

Following are the default windows services that are already enabled in the sample windows.cfg. Make sure to update the host_name on these services to reflect the host_name defined in the above step.

define service{

use                     generic-service

host_name               remote-windows-host

service_description     NSClient++ Version

check_command           check_nt!CLIENTVERSION

define service{

use                     generic-service

host_name               remote-windows-host

service_description     Uptime

check_command           check_nt!UPTIME

define service{

use                     generic-service

host_name               remote-windows-host

service_description     CPU Load

check_command           check_nt!CPULOAD!-l 5,80,90

define service{

use                     generic-service

host_name               remote-windows-host

service_description     Memory Usage

check_command           check_nt!MEMUSE!-w 80 -c 90

define service{

use                     generic-service

host_name               remote-windows-host

service_description     C:\ Drive Space

check_command           check_nt!USEDDISKSPACE!-l c -w 80 -c 90

define service{

use                     generic-service

host_name               remote-windows-host

service_description     W3SVC

check_command           check_nt!SERVICESTATE!-d SHOWALL -l W3SVC

define service{

use                     generic-service

host_name               remote-windows-host

service_description     Explorer

check_command           check_nt!PROCSTATE!-d SHOWALL -l Explorer.exe

5. Enable Password Protection

If you specified a password in the NSC.ini file of the NSClient++ configuration file on the Windows machine, you’ll need to modify the check_nt command definition to include the password. Modify the /usr/local/nagios/etc/commands.cfg file and add password as shown below.

define command{

command_name   check_nt

command_line   $USER1$/check_nt -H $HOSTADDRESS$ -p 12489 -s My2Secure$Password -v $ARG1$ $ARG2$

6. Verify Configuration and Restart Nagios.

Verify the nagios configuration files as shown below.

[nagios-server]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Total Warnings: 0

Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

Restart nagios as shown below.

[nagios-server]# /etc/rc.d/init.d/nagios stop

Stopping nagios: .done.

[nagios-server]# /etc/rc.d/init.d/nagios start

Starting nagios: done.

Verify the status of the various services running on the remote windows host from the Nagios web UI (http://nagios-server/nagios) as shown below.

Computer Performance Monitoring

This is my concise reference on analyzing and tuning Microsoft Windows and Unix/Linux machines using counters and other tools for performance profiling