Le 27/08/2013 22:49, jcbollinger a écrit :
> Your modules are not independent in any case. The data dependency is a
> symptom, not the root issue.
Yes, you are right.
> To answer more generally, since you started by posing a rather general
> problem, where you have a bona fide configuration dependency, it is not
> wrong for one module to depend on another. Real systems are composed of
> multiple interdependent pieces, so it is natural for your models of them to
> contain dependencies. You can shift them around to various places and
> forms, but you cannot omit them and still have anything of much use.
Ok, I understand, impossible to escape real dependencies, that's life.
> One place you did not mention, to which you could shift the dependency
> modeling, is your data. For example, lift your 'community' key to the top
> level of your YAML data, consolidating all copies of it. Then have any
> class that needs that particular key just load it.
Very good idea. In fact, I saw the things with an oriented object approach: a
class must know its data.
> I don't think there is a clear, universal right answer here. My best
> advice is to find where each datum belongs, and put it there. Coincidental
> data duplication should not concern you overmuch, but do avoid duplicating
> data for the purpose of presenting a false semblance of independence.
Ok, I keep theses advices in my mind:
- no duplication of data
- define clearly where each datum belongs and put it there.
I think it's a good idea to border the dependency on the data and not in
the puppet code.
I thought about another way with the extlookup function.
---
snmp:
community: extvalue_community
monitoring:
community: extvalue_community
And in a common.csv file:
extvalue_community,abcd1234
Then:
class snmp {
$snmp = hiera_hash('snmp')
$community = extlookup($snmp['community'])
# and the rest of the class...
}
class monitoring {
$monitoring = hiera_hash('monitoring')
$community = extlookup($monitoring['community'])
# and the rest of the class...
}
I don't know if it's good method.
Thanks for your help John.
--
Francois Lafont
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