Puppet users - Aug 2008 - Return value from resource, is it possible ?

Hi friend,
As i known, resources don''t have the return value. Do I have other
method to
return a value after executing a resource? More detail: from client, I want
to check 2 connection, if a connection is alive, my own resource will return
this value or set a variable with that value, so other resource can use it
How can i do like that?
Thank for your help
TungDH

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On Wed, Aug 13, 2008 at 9:00 PM, tung dang <danghuutung@gmail.com>
wrote:
> Hi friend,
> As i known, resources don''t have the return value. Do I have other
method to
> return a value after executing a resource? More detail: from client, I want
> to check 2 connection, if a connection is alive, my own resource will
return
> this value or set a variable with that value, so other resource can use it
> How can i do like that?
You can''t really do that in the way you want.

If what you are trying to do is take an action depending on whether or
not a connection is up, you might do something like:

exec { "take-action":
   command => "do something",
   refreshonly => true
}

exec { "connection-is-up":
  command => "some command",
  notify => Exec["take-action"]
}

That will cause the action to be taken only if the connection is up
exec returns 0.

The reason this won''t work the way you intend is that the manifest is
compiled on the server, not the client.  This means that by the time
you are evaluating the state of your resources, it''s too late to be
passing around return codes and altering the execution path.

Regards,
Adam

-- 
HJK Solutions - We Launch Startups - http://www.hjksolutions.com
Adam Jacob, Senior Partner
T: (206) 508-4759 E: adam@hjksolutions.com

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whats wrong with "onlyif" ?

exec { "take-action":
	command => "do something",
	onlyif => "some command",
}



Adam Jacob schrieb:
> On Wed, Aug 13, 2008 at 9:00 PM, tung dang <danghuutung@gmail.com>
wrote:
>> Hi friend,
>> As i known, resources don''t have the return value. Do I have
other method to
>> return a value after executing a resource? More detail: from client, I
want
>> to check 2 connection, if a connection is alive, my own resource will
return
>> this value or set a variable with that value, so other resource can use
it
>> How can i do like that?
> 
> You can''t really do that in the way you want.
> 
> If what you are trying to do is take an action depending on whether or
> not a connection is up, you might do something like:
> 
> exec { "take-action":
>    command => "do something",
>    refreshonly => true
> }
> 
> exec { "connection-is-up":
>   command => "some command",
>   notify => Exec["take-action"]
> }
> 
> That will cause the action to be taken only if the connection is up
> exec returns 0.
> 
> The reason this won''t work the way you intend is that the manifest
is
> compiled on the server, not the client.  This means that by the time
> you are evaluating the state of your resources, it''s too late to
be
> passing around return codes and altering the execution path.
> 
> Regards,
> Adam
> 
--

Nothing at all!

Clearly written pre-coffee.  :)

Adam

On Thu, Aug 14, 2008 at 10:01 AM, Phillip Scholz
<phillip.scholz@1und1.de> wrote:
> whats wrong with "onlyif" ?
>
> exec { "take-action":
>        command => "do something",
>        onlyif => "some command",
> }
>
>
>
> Adam Jacob schrieb:
>>
>> On Wed, Aug 13, 2008 at 9:00 PM, tung dang
<danghuutung@gmail.com> wrote:
>>>
>>> Hi friend,
>>> As i known, resources don''t have the return value. Do I
have other method
>>> to
>>> return a value after executing a resource? More detail: from
client, I
>>> want
>>> to check 2 connection, if a connection is alive, my own resource
will
>>> return
>>> this value or set a variable with that value, so other resource can
use
>>> it
>>> How can i do like that?
>>
>> You can''t really do that in the way you want.
>>
>> If what you are trying to do is take an action depending on whether or
>> not a connection is up, you might do something like:
>>
>> exec { "take-action":
>>   command => "do something",
>>   refreshonly => true
>> }
>>
>> exec { "connection-is-up":
>>  command => "some command",
>>  notify => Exec["take-action"]
>> }
>>
>> That will cause the action to be taken only if the connection is up
>> exec returns 0.
>>
>> The reason this won''t work the way you intend is that the
manifest is
>> compiled on the server, not the client.  This means that by the time
>> you are evaluating the state of your resources, it''s too late
to be
>> passing around return codes and altering the execution path.
>>
>> Regards,
>> Adam
>>
>
> --
>
>


-- 
HJK Solutions - We Launch Startups - http://www.hjksolutions.com
Adam Jacob, Senior Partner
T: (206) 508-4759 E: adam@hjksolutions.com

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Thank you very much
Your answer help me solve many questions.
My solution is checking connection on the server (I wrote a function in Ruby
to check connections, and return the successful connection). But sometime,
this solution is not very good, because the connection can be success with
server, but also can be failure with client (it depends on configuration,
firewall, etc ..)
Although, thank you very much for your help
TungDH

> The reason this won''t work the way you intend is that the manifest
is
> compiled on the server, not the client.  This means that by the time
> you are evaluating the state of your resources, it''s too late to
be
> passing around return codes and altering the execution path.
>
> Regards,
> Adam
>
> --
> HJK Solutions - We Launch Startups - http://www.hjksolutions.com
> Adam Jacob, Senior Partner
> T: (206) 508-4759 E: adam@hjksolutions.com
>
> >
>
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