Tripp Lite 0 Idades Manual

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Chapter 10: Nagios Integration
10.2 Central management and setting up SDT for Nagios 
The Nagios solution has three parts: the Central Nagios server, Distributed Console Servers and the SDT for Nagios software.
 
Central Nagios server
• A vanilla Nagios 2.x or 3.x installation (typically on a Linux server)\
• Generally running on a blade, PC, virtual machine, etc. at a central loc\
ation
• Runs a web server that displays the Nagios GUI
• Imports configuration from distributed Console Servers...

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10.2.2 Set up distributed Console Servers 
This section provides a brief walk-through on configuring a single Con\
sole Server to monitor the status of one attached network 
host (a Windows IIS server running HTTP and HTTPS services) and one serially attached device (the console port of a \
network 
router), and to send alerts back to the Nagios server when an administr\
ator connects to the router or IIS server. 
While this walk-through provides an example, details of...

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• Scroll down to Nagios Settings and check Enable Nagios
• Click New Check and select Check Ping. Click check-host-alive 
• Click New Check and select Check Permitted TCP. Select Port 3389
• Click New Check and select Check TCP. Select Port 80
• Click New Check and select Check TCP. Select Port 443
• Click Apply
Similarly, configure the serial port to the router to be monitored by Nagios:
• Select Serial Port from the Serial & Network menu
• Locate the serial port that...

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10.3 Configuring Nagios distributed monitoring
To activate the Console Server’s Nagios distributed monitoring:
• Nagios integration must be enabled and a path established to the central\
/upstream Nagios server
• If the Console Server is to periodically report on Nagios-monitored serv\
ices, then the NSCA client embedded in the 
Console Server must be configured: the NSCA program enables scheduled \
check-ins with the remote Nagios server and is 
used to send passive...

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10.3.2  Enable NRPE monitoring 
 
Enabling NRPE allows you to execute plug-ins (such as check_tcp and check_ping) on the remote Console Server to monitor 
serial or network attached remote servers. This will offload CPU load \
from the upstream Nagios monitoring machine which is 
especially valuable if you are monitoring hundreds or thousands of hosts\
. To enable NRPE:
• Select System: Nagios and check NRPE Enabled
• Enter the details for the user connection to the...

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10.3.3  Enable NSCA monitoring 
NSCA is the mechanism that allows you to send passive check results from\
 the remote Console Server to the Nagios daemon 
running on the monitoring server. To enable NSCA:
• Select System: Nagios and check NSCA Enabled
• Select the Encryption to be used from the drop-down menu, then enter a Secret password and specify a check Interval
• Refer the sample Nagios configuration section below for some examples \
of configuring specific NSCA...

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10.3.4 Configure selected Serial Ports for Nagios monitoring
The individual Serial Ports connected to the Console Server to be monitored must be configure\
d for Nagios checks. Refer to 
Chapter 4.4: Network Host Configuration for details on enabling Nagios monitoring for Hosts that are network co\
nnected to the 
Console Server. To enable Nagios to monitor a device connected to the Console Server seri\
al port:
• Select Serial & Network: Serial Port and click Edit on...

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• The Nagios Check nominated as the check-host-alive check is used to determine whether the network host itself is up 
or down
• Typically this will be Check Ping – although in some cases the host will be configured not to respon\
d to pings
• If no check-host-alive check is selected, the host will always be assumed to be up
• You may deselect check-host-alive by clicking Clear check-host-alive
• If required, customize the selected Nagios Checks to use custom arguments...

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10.4 Advanced Distributed Monitoring Configuration
10.4.1  Sample Nagios configuration 
An example configuration for Nagios is listed below. It shows how to set up a remote Console Server to monitor a single hos\
t, 
with both network and serial connections. Each check has two configura\
tions, one for NRPE and one for NSCA. In practice, 
these would be combined into a single check which uses NSCA as a primary\
 method and falling back to NRPE if a check were 
late. For...

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define service {
 service_description serial-signals-server
 host_name  server
 use   generic-service
 check_command  check_serial_status
 active_checks_enabled 0
 passive_checks_enabled 1
 }
define servicedependency{
 name    tripplite_nrpe_daemon_dep
 host_name   tripplite
 dependent_host_name  server
 dependent_service_description  Serial Status
 service_description  NRPE Daemon
 execution_failure_criteria w,u,c
 }
; Port Log
define command{
 command_name...