Re: [Devmon] possible bug in multinode

[Buchan M. <bg...@gm...>]

> OK, this one has taken me a bit to track down. I updated my xymon config
> and devmon died.
>

Did the normally polling process die? Do you have any relevant log
messages? Or did it exhibit the same behaviour as below?


>
> Below is the devmon/xymon info from the xymon hosts file:
>
> DEVMON:model(cisco;2960),except(all;ifName;ao:Gi1/0/[1-
> 4]|Gi1/0/[7,8,9,10,11]|Gi1/0/[23,24,25,26,27,28,29,30,31,32,
> 33,34]|Gi1/0/[45,46,47,48])
>

You can't use commas inside the regex, as it makes it difficult to parse
the different types of options (which are separated by commas).

You probably want something like this:

DEVMON:model(cisco;2960),except(all;ifName;ao:Gi1/0/[1-4]|Gi1/0/([7-9]|10|11|2[3-9]|3[0-4]|4[5-8]))

This kind of problem is that my colleagues have had as well, and maybe at
some point it needs to be easier to configure devmon. But that would
probably require a database of some kind (where at present using a database
is optional), and the Xymon community seems to be averse to requiring a
database.


>
> After I make a mod in that, I restart devmon.  My init script executes
>
> devmon --readbbhosts
>
> to update the database.  What I find in the DB, with the line above is:
>
> | switch       | all     | ifName | alarm   | Gi1/0/[1-4]|Gi1/0/[7 |
>
> so the DB update is being truncated.  Just for fun, I manually updated the
> DB with information as in the hosts and devmon is completely happy.
> Running devmon with the data above,
> and devmon exist with an error for the regex (correctly).
>
> when I use this regex:
>
> DEVMON:model(cisco;2960),except(all;ifName;ao:Gi1/0/[1-
> 4]|Gi1/0/[7-11]|Gi1/0/[23-34]|Gi1/0/[45-48]
>

This regex is invalid, as the values inside square brackets in a *regex*
need to represent a consecutive range of single characters, not a range of
values.


>
> the database loads correctly:
>
> | switch       | all     | ifName | alarm   | Gi1/0/[1-4]|Gi1/0/[7-11]|Gi1/0/[23-34]|Gi1/0/[45-48]
> |
>
> and devmon still dies parsing the regex:
>
> Invalid [] range "7-1" in regex; marked by <-- HERE in
> m/^(Gi1/0/[1-4]|Gi1/0/[7-1 <-- HERE 1]|Gi1/0/[23-34]|Gi1/0/[45-48])$/ at
> /usr/local/devmon-0.3.1-beta1/modules/dm_tests.pm
> line 1853
>
> bug or do I just not understand?
>
>
Well, the best solution here is that same code should actually be used to
validate the regex when loading the config as at run-time, so that anything
that is accepted into configuration will not cause devmon to die.

Regards,
Buchan