[ale] SNMP oid for file descriptors

[Todor Fassl]

Ah, now I am starting to get it.

It occurs to me that this is a good approach in general for solving all 
kinds of system monitoring problems. Like I once worked for a web 
hosting service. We stored info about each account in a file within the 
account. But how to get to that info remotely? We considered picking a 
port number, inventing our own protocol, and writing a TCP/IP server. 
Should have just added it to snmp and used snmp's own security protocols 
to protect it. Before that I worked for a company that wrote drivers for 
medical scanners. We *did* pick a port number and invent our own 
protocol to get status info from the scanner.

The beauty of the thing, besides not re-inventing the wheel, is that 
standard tools like nagios could be used to monitor the data.

I'll have to do some research.



On 08/07/2018 10:55 AM, Alex Carver via Ale wrote:
> You create your own OID table entry.  Use the extend or pass-through
> capability of snmpd and a shell script to generate an SNMP table or tree
> output and then obtain it starting with the base tree
> 
> NET-SNMP-EXTEND-MIB::nsExtensions (.1.3.6.1.4.1.8072.1.3)
> 
> 
> 
> On 2018-08-07 07:00, Todor Fassl via Ale wrote:
>> Well, I am not too worried about being able to calculate it. What I
>> cannot figure out is how to get to the numbers remotely.
>>
>>
>> On 08/06/2018 01:21 PM, Jerald Sheets wrote:
>>> Why not pull the number of file handles you have: "sysctl fs.file-nr"
>>> and compare it to current open file handles “lost |wc -l” and do a
>>> multi-graph for the metrics.  Then, also subtract the two and alert
>>> when you get below whatever threshold you want?
>>>
>>> I think you should be able to knock that out in BASH or Perl.
>>>
>>> —j
>>>
>>>
>>>
>>>> On Aug 6, 2018, at 1:49 PM, Todor Fassl via Ale <ale at ale.org> wrote:
>>>>
>>>> Ultimately, what I want to do is to configure nagios to alert me when
>>>> a server is getting low on file handles. There are a couple of
>>>> scripts on the nagios web site but they look kind of hokey.
>>>>
>>>> I think all I should have to do is cut/pasete the right SNMP object
>>>> identifier into the nagios snmp plugin. But how to find that oid?
>>>>
>>>>
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>>
> 
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-- 
Todd