Réf. : [NV-L] Réf. : [NV-L] Réf. : [NV-L] Re: Réf. : [NV-L] Global Varia

Alexis

At any point in time there should only be one or two devices stored in memory.
What happens within the daemon is that when a device goes down I create a
structure in memory to store relevant information. When the device comes back
up again the structure data is updated and the structure remains in memory.
Included in the stored information is the time the struct was created or
modified. Periodically a thread of the daemon runs through the structures in
the memory linked list and frees up those that represent a device that is
currently up and where the structure has not been accessed for 60 minutes. In
this way the list is kept nice and small but I don't have the overhead of
repeatedly creating & deleting the structure when a device is flapping.

As far as I can see the daemon uses very little CPU and has no perceptible
effect on the Netview processor, even on my brain dead development box. On the
production system which has heaps of CPU & RAM the daemon load is absolutely
minimal. In any event it has to be faster than spawning a shell script or PERL
script being a compiled executable. If it ever does become a problem I will
roll up my sleeves and re-code it all in assembler (I'm old and grey enough to
remember how to write this much ignored language)

Cheers - Gavin

>>> <alexis.henry AT bnpparibas DOT com> 09/08/2000 17:46:35 >>>
It was a pleasure.
At the very begining i bored a lot of people on the list, i think it is time for
me to help as well as i can.

Only one question: how many devices will you store in memory ? Don't you slow
the Netview box doing so ?

I agree what you said about the rules editor, such a pity there's no way to
write with a text based editor.

Regards.
Alexis

Internet

NEWMANGJ AT banksa.com DOT au on 09/08/2000 01:20

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cc :
ccc : Alexis Henry
Objet : [NV-L] Réf. : [NV-L] Réf. : [NV-L] Re: Réf. : [NV-L] Global Variable
Names

Alexis

Thanks for your perserverence with this and your assistance. I ended up writing
a daemon process which manages an in-memory store for device status and call
that from an in-line action. This has the required result and was much more fun
to write.

Life would be a lot easier if Netview allowed a C-like text based programming
language for the rules editor instead of the GUI. The GUI seems to be aimed at
small non-complex rules, when writing large complex rules it seems that the GUI
gets in the way especially when the rule covers more real estate than the screen
can display and also when the GUI reorganises the layout of nodes every time a
new node is added. Just as you get a mental picture of the entire rule the GUI
seems to shift the nodes around - tres confusing non! (Excuse my attempt at
schoolboy French but I last touched that language in 1965!)

Regards - Gavin

>>> <alexis.henry AT bnpparibas DOT com> 08/08/2000 17:42:18 >>>
I tried to do it exporting environment variable but i failed. I don't see how to
do it the way you want it.
So try to do it using shell script as i explain to you. I think that the better
way to do it is to put your data and their value in a file.
With grep and cut command you can do it easily.

Just my two cents.

Good luck.

Alexis Henry
Banque Nationale de Paris.

Internet

NEWMANGJ AT banksa.com DOT au on 08/08/2000 01:39

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Objet : [NV-L] Réf. : [NV-L] Re: Réf. : [NV-L] Global Variable Names

Alexis

Thanks again for your reply.

Yes, I want to create a global variable in the rules with the name of the
variable being the contents of $NVATTR_3 ie the name of the device that is down.
The reason for this is that I want to be able to keep a variable for each device
that is currently down.

Cheers - Gavin

>>> <alexis.henry AT bnpparibas DOT com> 07/08/2000 17:03:55 >>>
Yes my trick is to be done in a shell script.
If i understand the matter i don't see how to do it otherwise.

Let me ask a question so i can be sure i understand you: do you want to set a
variable whose name is the value of $NVATTR_3 ? If so i don't see any other way
to do it. If you don't want to write a shell script you can do it on one line in
an action node an try to export this data. I don't know if that will work.

I will try to do it.

As soon as i am successful i will mail the way to do it to you.

Alexis

Internet

NEWMANGJ AT banksa.com DOT au on 07/08/2000 01:51

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Objet : [NV-L] Re: Réf. : [NV-L] Global Variable Names

Alexis

Does your trick refer to doing it in a shell script?? What I want to do is
establish the variable in the actual rule - is in the Set Global Variable node I
want to create a variable that takes the name of the device that the event
refers to and then assign a value for it.

Cheers - Gavin

>>> <alexis.henry AT bnpparibas DOT com> 04/08/2000 16:58:06 >>>

Hi Gavin !

There is a trick to do so but it is quite a strange way to do it.
If i understand well you should do it this way:

echo $var | read $(echo $NVATTR_3).
(let assume that "var" is the data you want to set in what you named $$NVATTR_
3)

I explain: "read" is an Aix command that set a data with a stream comming from
<STDIN> wich name is the first argument in the command line.
Here i do $(echo $NVATTR_3) so the shell return "fred" because $NVATTR_3 is
"fred"

So: echo $var | read $(echo $NVATTR_3) ==> echo $var | read fred
Then if you run "echo $fred" you will see the value in "var".
The $fred data now exists.

Alexis Henry
Banque Nationale de Paris.

NEWMANGJ AT stgeorge.com DOT au on 04/08/2000 04:31:22

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Objet : [NV-L] Global Variable Names

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Réf. : [NV-L] Réf. : [NV-L] Réf. : [NV-L] Re: Réf. : [NV-L] Global Variable Names