I was thinking of this in a very fine grained way, such as a metaparameter.
The situation that made me think of this is:
class foo {
file { 'super/important':
ensure => 'file',
content => 'something great\n'
}
exec { 'nice to have happen':
command => 'check stuff and set a file',
fail => 'soft'
}
}
class bar {
require 'foo'
# stuff that requires super/important file
}
Basically, the exec in 'foo' is there because it's logical to place it
there, but some of it (the exec) just doesn't matter if it fails or
not.
I see this being most relevant in the case of execs, but could apply
to some situations where everything might be a soft failure except for
a service starting.
Trevor
On Wed, Jul 22, 2009 at 02:38, Luke Kanies<l...@madstop.com> wrote:
>
> On Jul 21, 2009, at 5:31 PM, Trevor Vaughan wrote:
>
>>
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>> Hash: SHA1
>>
>> This is going to be a great feature.
>>
>> Over time, I've been struggling with trying to keep things extremely
>> modular (perhaps too much so) but still well ordered.
>>
>> When I can make every class that needs apache just 'require apache', I
>> will be quite happy.
>>
>> However, I think that this means that if *anything* in the class
>> fails,
>> the dependent classes will fail too, is this correct?
>
> Yes, the dependent classes will be skipped if any resources in the
> required classes fail.
>
>>
>> Is there any way to make some things fail softly so that they can be
>> less hard than class-wise fatal?
>
> Hmm, no one's ever asked before.
>
> It seems reasonable that we could mark some resources as non-fatal,
> but what resources would you mark this way?
>
>>
>> Thanks,
>>
>> Trevor
>>
>> On 07/21/2009 05:31 PM, James Turnbull wrote:
>>> Burkholder, Peter wrote:
>>>> I just finished listening to the Configuration Management panel from
>>>> OSBridge (on blip.tv).
>>>>
>>>> Near the end of it, Adam Jacob states that Puppet's resource
>>>> dependency
>>>> ordering is non-deterministic,
>>>> and that manifests that work fine 19 times will fail the 20th time.
>>>>
>>>> Is this true? I'm puzzled that what Luke considers one of Puppet's
>>>> strong suits is derided by
>>>> others as its Achille's heel.
>>>>
>>>
>>> There is a change in 0.25.0 that I also should have mentioned
>>> because it
>>> impacts this discussion.
>>>
>>> In 0.25.0 we've added a 'require' function. The doco is here:
>>>
>>> "Evaluate one or more classes, adding the required class as a
>>> dependency.
>>>
>>> The relationship metaparameters work well for specifying
>>> relationships
>>> between individual resources, but they can be clumsy for specifying
>>> relationships between classes. This function is a superset of the
>>> 'include' function, adding a class relationship so that the requiring
>>> class depends on the required class.
>>>
>>> .. Warning:: using require in place of include can lead to unwanted
>>> dependency cycles. For instance the following manifest, with
>>> 'require'
>>> instead of 'include' would produce a nasty dependence cycle, because
>>> notify imposes a before between File[/foo] and Service[foo]::
>>>
>>> class myservice {
>>> service { foo: ensure => running }
>>> }
>>>
>>> class otherstuff {
>>> include myservice
>>> file { '/foo': notify => Service[foo] }
>>> }
>>> "
>>>
>>> This takes some of the (potential) pain out of the ordering by
>>> allowing
>>> class level dependencies. This adds dependency resolution higher
>>> than
>>> between individual resources. It doesn't solve issues where you
>>> haven't
>>> built the right dependencies at a resource level but does provide
>>> more
>>> flexibility.
>>>
>>> This isn't the same as Chef - as Adam has pointed out Chef has top-
>>> down
>>> ordering rather than Puppet's dependency graph - but I think it'll
>>> make
>>> life easier for some people.
>>>
>>> Regards
>>>
>>> James Turnbull
>>>
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>
>
> --
> In our civilization, and under our republican form of government,
> intelligence is so highly honored that it is rewarded by exemption from
> the cares of office. --Ambrose Bierce
> ---------------------------------------------------------------------
> Luke Kanies | http://reductivelabs.com | http://madstop.com
>
>
> >
>
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