Re: Tables on agentx

On 02/04/2008, Vincent Royo <[email protected]> wrote:
>  I have the same data on each node, like number of disks, capacity, the
>  status of a dynamic set of services, etc.
>  The same mib is installed on all nodes. I think the correct way is to
>  use tables.

Are these MIBs that you have defined, or ones that you have been given
to work with?

There are two basic approaches to splitting a MIB over several subagents.

a)  Use "contexts" to register parallel versions of the same MIB table(s)
b)  Have each subagent register one (or more) individual rows in the table


>  I create the table in the mib and create the generic code with mib2c;

If you are using the first approach (parallel tables), then using mib2c
to generate a table framework (using any of the table helpers) is
sensible.

If you are registering individual rows, then mib2c won't help you.
In fact, don't think in terms of registering a table at all.   Instead
have each subagent reister one (or more) generic handlers. The
secret here is to register an OID *slice*, rather than a single OID.

The agent will combine these registrations to form an implicit table.

Unfortunately there aren't any examples of this in the Net-SNMP code.


>  what is the structure of the code generated by mib2c when I use
>  mib2c.mfd.conf?

Pass.
You'd probably do best asking that on the IRC channel
The MfD framework is Robert's baby, and he's the best
one to answer that question.

>  What is the difference between container and cache?

The "container" is effectively the table.   It's a structure that
contains information about the individual rows (including the
row data itself, the index of that row, etc)

The "cache" is a structure used to decide whether the
contents of the table are OK to use, or whether it is
"too old" and should be reloaded.

Dave

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