Re: minor note on APC devices with SNMP

On 08/12/06, Dan Mahoney, System Admin <[email protected]> wrote:
> > You could look at the exit code from snmpset.
> > If the remote agent indicates failure, it returns 2.
> >
> > But this wouldn't distinguish between different reasons
> > *why* the request failed.  For that, you'd need to catch
> > the textual error message, and match against that.
>
> Which I didn't get much of here, the error is very "general",

But that's potentially informative in itself.
This isn't the sort of error that would tend to result
from "normal" failures.  So you could reasonably
assume that a 'genError' implies someone is logged in.

Check for that particular text in the error message,
and use that to trigger your delay-and-retry approach.


> Sadly, since the box disables snmp when you log in, I can't even pre-check
> via SNMP to tell if someone IS logged in.

What happens if you try to query the box with someone logged in?
You you get an error back, or simply a timeout?

In either case, you could use that as a pre-check.
Try a trivial SNMP get request, and wait until that
succeeds before sending the SET request.

Dave

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