Multitech MultiModem iSMS SF100-G Manual de usuario descargar pdf

2 | march 2010 www.linuxjournal.com

’m a big fan of the Nagios network monitoring system

and rely on it to tell me if something goes wrong with the

systems for which I am responsible. I have made a large

investment in time configuring Nagios to monitor exactly

what I am interested in, and this effort would be wasted

if Nagios detected a problem, but failed to communicate

that problem to me. To make Nagios more robust, I wanted

to make sure that its alerting mechanism did not depend on

connections to the Internet—this would include the physical

connection itself and internal and external services, such as

e-mail, routing and DNS.

I have relied on e-mail-based systems in the past to deliver

alerts; however, my dilemma was that if I was not getting

e-mail, I did not know if this meant everything was okay or

if there was some problem preventing me from getting the

e-mail alerts, such as a down Internet connection or another

kind of e-mail failure. I found that I became uneasy after long

periods of silence and felt compelled to “poll” the system to

make sure everything was okay.

On the other hand, I felt that if my alerting system was

robust and I could trust it, my thinking would become “no

news is good news”, and the absence of alerts would mean

everything was fine.

I’ve found that the Short Message Service (SMS) text service

available on GSM cellular networks meets my requirements for

a trusted alerting server. It is generally available and is unlikely

to go down. A major disaster certainly could take down or

overwhelm the cellular service, but I figure I would be aware

of such an event and probably would have bigger and more

pressing concerns than network management at that point.

There are several different ways to implement a Nagios-to-

SMS service, and I certainly have not explored them all. This

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Using an

SMS Server

to Provide

a Robust

Alerting Service

for Nagios

ERIC PEARCE

How to implement a Nagios-to-SMS service.

1 2 3 4 5

Indice de contenidos

Pagina 1 - ERIC PEARCE

2 | march 2010 www.linuxjournal.comI’m a big fan of the Nagios network monitoring systemand rely on it to tell me if something goes wrong with thesyst

Pagina 2 - Ordering SMS Service

article describes the system I am using, which is the MultiTechSystems MultiModem iSMS Intelligent SMS server (Figure 1) in combination with a public

Pagina 3 - Script Installation

Physical Location of iSMSI wanted the iSMS and the Nagios server to be able to sendmessages for as long as possible if there were a problem withnetwor

Pagina 4

“ACK” text prepended. I found the best way to do this onboth older text-based and newer graphical mobile phones wasto “forward” the entire message rec

Pagina 5 - The iSMS can send helpful

ApacheI initially had multiple overlapping “Directory” statementsin the Nagios section of the Apache configuration file. The net effect was a “Permiss

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