Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-10 Thread Kathy McLeod 
Hi -

For the -1, I was referring to the value in the .h file.  For example,
#define LLDPLOCMANADDRTABLE_TIMEOUT  60

Change the 60 to -1.  The mib2c with the cache option generates a default
value (in this case, 60) and you can adjust it.  I haven't tried the "on
the fly" option yet.

There is another mib2c for scalars - mib2c.scalar.conf.


Kathy McLeod


   
 "Alexander King"  
 To 
   Kathy McLeod/Rochester/i...@ibmus,   
 08/06/2010 04:52  "net-snmp-users"
 AM 
cc 
   
   Subject 
           Re: Re: net-snmp init_XXX() get 
           data periodically( or cyclic )  
   problem 
   
   
   
   
   
   




Thank you all kind man!

I will do my best get a prototype the way Dave teaching me ASAP.


Also, I thought -1 was the value for "load every time".
>>I saw the letter later Dave's wrote back,is it the meaning use "mib2c -S
cache=-1 -c mib2c.iterate.conf uit" can get the really data on the
fly???and how about the saclars data?


I got a little inspiration,I think.





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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-06 Thread Dave Shield 
On 6 August 2010 10:52, Alexander King  wrote:
> is it the meaning use "mib2c -S cache=-1 -c mib2c.iterate.conf uit"

No.
You are confusing different things.

The command to generate the code template would be
mib2c -S cache=1  mib2c.iterate.conf uit

Here the value '1' means "include the code for a local cache"
(as opposed to '0' which means "don't include any cache code")


What Kathy was referring to is the value used for the cache timeout
(which is specified as part of registering the cache handler).

   This is normally a timeout in seconds, and the agent will use values
from the cache until the cache is that many seconds old.   At which
point the next request will trigger a reload of the cache with a new
set of values, which will then be used for the next N seconds.

However if this cache timeout has the special value -1,
then this indicates that the cache should *always* be regarded
as "out-of-date", and hence every single request will trigger a
reload.
   This will obviously be somewhat timeconsuming and inefficient,
hence it's not something that we would recommend.   But if you
do insist on re-loading the data every time (and can accept the
increased load), that's how you could do it.

But I *strongly* suggest you experiment with small (non-negative)
timeout values first.

Dave

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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-06 Thread Alexander King 
Thank you all kind man!
  
 I will do my best get a prototype the way Dave teaching me ASAP.
   
 
Also, I thought -1 was the value for "load every time".
 >>I saw the letter later Dave's wrote back,is it the meaning use "mib2c -S 
 >>cache=-1 -c mib2c.iterate.conf uit" can get the really data on the fly???and 
 >>how about the saclars data?
  
  
 I got a little inspiration,I think.--
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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-04 Thread Dave Shield 
On 4 August 2010 15:29, Kathy McLeod  wrote:
> How do you alter the timeout value on the fly?

Via the NET-SNMP-AGENT-MIB::nsCacheTable


> Also, I thought -1 was the value for "load every time".

My apologies - you are quite correct.
  [See agent/helpers/cache_handler.c:netsnmp_cache_check_expired()]

Dave

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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-04 Thread Kathy McLeod 
Hi -

How do you alter the timeout value on the fly?

Also, I thought -1 was the value for "load every time".

Thanks.


Kathy McLeod
Dept S82  CCB - SNMP
IBM Rochester, MN
(507) 253-4803


   
 Dave Shield   
 To 
   Alexander King  
 08/04/2010 02:54   cc 
 AMnet-snmp-users  

   Subject 
   Re: Re: net-snmp init_XXX() get 
   data periodically( or cyclic )  
       problem 
   
   
   
   
   
   




On 4 August 2010 03:47, Alexander King  wrote:
> Now,I want to know how to get the newest data use net-snmp snmpd daemon
> routine.That is to say,Is there a way when I use "snmpwalk" command
browse
> the uit data tree I get the updated or newest or latest data each time?

I will repeat my suggestion from yesterday.
Use one of the mib2c templates generated with '-S cache=1'
That will produce code that uses a local cache, with a 'load'
routine, which will be called when the cache is "too old".

If you set the timeout for the cache to be 0, then the data will
be reloaded for every single new SNMP request.

But note that this is every *request* - not every command.
A single 'snmpwalk' command will trigger a whole sequence of
GETNEXT requests, each of which will re-load the cache.
That's why I think you might be better off with a cache timeout
of a few seconds.

   But experiment - altering the timeout is a trivial change
(and can even be done on the fly).   No code changes are needed.
Get something working using the cache first, and then worry
about tuning the cache frequency.

Dave

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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-04 Thread Dave Shield 
On 4 August 2010 03:47, Alexander King  wrote:
> Now,I want to know how to get the newest data use net-snmp snmpd daemon
> routine.That is to say,Is there a way when I use "snmpwalk" command browse
> the uit data tree I get the updated or newest or latest data each time?

I will repeat my suggestion from yesterday.
Use one of the mib2c templates generated with '-S cache=1'
That will produce code that uses a local cache, with a 'load'
routine, which will be called when the cache is "too old".

If you set the timeout for the cache to be 0, then the data will
be reloaded for every single new SNMP request.

But note that this is every *request* - not every command.
A single 'snmpwalk' command will trigger a whole sequence of
GETNEXT requests, each of which will re-load the cache.
That's why I think you might be better off with a cache timeout
of a few seconds.

   But experiment - altering the timeout is a trivial change
(and can even be done on the fly).   No code changes are needed.
Get something working using the cache first, and then worry
about tuning the cache frequency.

Dave

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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Alexander King 
On 3 August 2010 10:34, Yongting Lin  wrote:
>As in this situation, can register a peridoical alarm to monitor the
> condition, and send traps if condition changed?  or project-specified code(A
> daemon in pratical program) act as a subagent to snmpd, and invokde
> send_v2trap function to send traps when itself detects some condition
> changed?
>
> Is my thought feasible?
 
 Yes,I know what your really meaning is,there is another routine call 
send_uit_traps() send the traps if some values chanaged.
  
 Now,I want to know how to get the newest data use net-snmp snmpd daemon 
routine.That is to say,Is there a way when I use "snmpwalk" command browse the 
uit data tree I get the updated or newest or latest data each time?
 


Yes - that should work.

Is the condition that you are monitoring covered by an existing MIB object?
 Yes,all the monitor objects and the code get from the MIB files.
  
  
 
If so, then you should be able to use the DisMan Event MIB support to
handle this already, without needing to write any new code at all.

See the relevant section in the snmpd.conf man page.

Dave--
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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Yongting Lin 
Hi Dave:
   
   As in this situation, can register a peridoical alarm to monitor the 
condition, and send traps if condition changed?  or project-specified code(A 
daemon in pratical program) act as a subagent to snmpd, and invokde send_v2trap 
function to send traps when itself detects some condition changed?

Is my thought feasible?

Best Regards!

Ivan Lin.


previous email-
 
On 3 August 2010 09:04, Alexander King  wrote:
> I want to the init_uit routine can get data periodically
The "init_xxx"  routine is called *once* to set up the module,
when the agent first starts  That's what the word initialise means.
It will not be called repeatedly, and is not the right place to
handle (re-)loading data.
> Would you give me some hits?
Look at using the cache helper.
If you run 'mib2c -Scache=1  mib2c.iterate.conf   myTable'
then this should generate a suitable template.
I don't think the scalar mib2c template has a similar option,
but you can always apply the same techniques there.
As regards generating notifications, it would probably be
more sensible to either pass the relevant data into the
routine that generates the trap.   Or else have this routine
refresh the cached data itself.
   There's no point in re-loading the data just in case the
agent might possibly need to send a trap
Dave
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Re: Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Dave Shield 
On 3 August 2010 10:34, Yongting Lin  wrote:
>    As in this situation, can register a peridoical alarm to monitor the
> condition, and send traps if condition changed?  or project-specified code(A
> daemon in pratical program) act as a subagent to snmpd, and invokde
> send_v2trap function to send traps when itself detects some condition
> changed?
>
> Is my thought feasible?


Yes - that should work.

Is the condition that you are monitoring covered by an existing MIB object?
If so, then you should be able to use the DisMan Event MIB support to
handle this already, without needing to write any new code at all.

See the relevant section in the snmpd.conf man page.

Dave

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Re: Fw:Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Dave Shield 
On 3 August 2010 09:51, Alexander King  wrote:
>> Look at using the cache helper.
>> If you run 'mib2c -Scache=1  mib2c.iterate.conf   myTable'

>sys-man mibs # mib2c -Scache=1 mib2c.iterat.conf uit
> no variable specified for -S flag. at /usr/local/bin/mib2c line 96.

OK - Try putting a space after the '-S'
I.e.
mib2c -S cache=1 

[I always get that wrong!]

Dave

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Fw:Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Alexander King 
-- Original --
  From:  "Dave Shield";
 Date:  Tue, Aug 3, 2010 04:42 PM
 To:  "Alexander King"; 
 Cc:  "net-snmp-users"; 
"林永听"; 
 Subject:  Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

  
 On 3 August 2010 09:04, Alexander King  wrote:
> I want to the init_uit routine can get data periodically
The "init_xxx"  routine is called *once* to set up the module,
when the agent first starts  That's what the word initialise means.
It will not be called repeatedly, and is not the right place to
handle (re-)loading data.
 >>if so,How can I deal with this situation???I need more information ^_^
 
> Would you give me some hits?
Look at using the cache helper.
If you run 'mib2c -Scache=1  mib2c.iterate.conf   myTable'
  
 >>sys-man mibs # mib2c -Scache=1 mib2c.iterat.conf uit
no variable specified for -S flag. at /usr/local/bin/mib2c line 96.
sys-man mibs #

 I use net-snmp 5.4.2.1
  
 
then this should generate a suitable template.
I don't think the scalar mib2c template has a similar option,
but you can always apply the same techniques there.
As regards generating notifications, it would probably be
more sensible to either pass the relevant data into the
routine that generates the trap.   Or else have this routine
refresh the cached data itself.
 >> Yes,I have another routine to do this,and this routine get data is the 
 >> newest,can call the function sent trap immediately when the data changed.
 
There's no point in re-loading the data just in case the
agent might possibly need to send a trap
Dave--
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Re: net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Dave Shield 
On 3 August 2010 09:04, Alexander King  wrote:
> I want to the init_uit routine can get data periodically

The "init_xxx"  routine is called *once* to set up the module,
when the agent first starts  That's what the word initialise means.
It will not be called repeatedly, and is not the right place to
handle (re-)loading data.

> Would you give me some hits?

Look at using the cache helper.

If you run 'mib2c -Scache=1  mib2c.iterate.conf   myTable'
then this should generate a suitable template.

I don't think the scalar mib2c template has a similar option,
but you can always apply the same techniques there.

As regards generating notifications, it would probably be
more sensible to either pass the relevant data into the
routine that generates the trap.   Or else have this routine
refresh the cached data itself.
   There's no point in re-loading the data just in case the
agent might possibly need to send a trap

Dave

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net-snmp init_XXX() get data periodically( or cyclic ) problem

2010-08-03 Thread Alexander King 
Hi Dave and All:
  
 Send trap problem was fixed,use a new routine.Thank you!
 snmp_alarm_register(5, /* seconds */
0,  /* repeat (every 10 seconds).here,the value is 0,can send 
the trap immediately! */  
send_uitJBODPowerATraps_trap,  /* our callback */
NULL/* no callback data needed */);
  
 

Another question,I use tools mib2c.iterate.conf mib2c.scalar.conf and 
mib2c.notify.conf get all my generate code,now the init_uit() got all the data 
rightly,but all the data was the time when they was got,not the newest,if I 
modified some of the device parameters,I couldnot got the update data,That's 
not the way I required it ,I want to the init_uit routine can get data 
periodically,so I can get the newest data.Would you give me some hits?
  
 Thank you,Dave!as usual.
  
 Alex--
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