[icinga-users] icinga-users Digest, Vol 37, Issue 9

Antony Stone Antony.Stone at icinga.open.source.it
Fri Jan 13 17:25:21 CET 2017

On Friday 13 January 2017 at 15:26:46, Vikas Tiwari wrote:

> Hi Antony,
> Thank you for taking time to reply.
> We are monitoring IOT devices. These devices are in remote locations and
> behind one-way NAT. We do not have the luxury of unlimited network and
> network at times can go bad.

You call them "IoT devices" - how much are they doing, and how complex is the 
monitoring you need to perform on them?

I assume you're not getting a whole set of data such as disk usage, number of 
processes, memory usage, network bandwidth... which would be common with full 
network client/server type devices.

So, what are you trying to measure about these things?

> > Why passive?
> Because I want the replay logs. Many times the connection b/w master and
> client breaks and in such scenarios we want the client to keep running the
> checks and send the check output when the connection re-establishes.

Okay, that sounds reasonable.

> > What bandwidth do you have available per client connection?
> I do not want 1 MB per hour. This will cost us 720 MB just for monitoring
> the IOT device. I want the data to be as much less as possible.
> Please note that i have already optimised all the checks to output as
> much data as possible.

Er, if you really mean what you just said, that could be your problem?

Surely to reduce bandwidth you want to minimise the data output from the 

How many checks are you performing on each device?

> > That equals around 256 bits per second (if KB means kilobits) or 2kbits
> > per second (if KB means kilobytes).
> That is Kilobytes.

So, 2kbits / second per device is excessive... hm, that's quite a tough 

> for an IOT device, is it the right tool ?

Difficult to say - what do *you* mean by "IoT", and what are you trying to 
measure about these things?


I lay awake all night wondering where the sun went, and then it dawned on me.

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