On Oct 1, 2008, at 8:02 AM, udo waechter wrote:
> Hello everybody,
> I have a question regarding virtual resources and the exporting/
> collection thereof.
>
> I have several hosts that should export one and the same file
> resource. This should be collected exactly once by one host.
> The resources are exported within a define:
>
> ## this define is used by many hosts.
> ## example: sge::queue{"testqueue": ensure => present }
> define sge::queue(...){
> @@file{"/var/lib/puppet/exported/sge/queue.template.${queue_name}":
> content => template("sge/queue.template.erb"),
> tag => "sge_queue_template",
> }
> }
>
> ### one host should import the File resource above.
> class queue_collect{
> File <<| tag == "sge_queue_template" |>>
> #there should be exactly one file:
> # /var/lib/puppet/exported/sge/queue.template.testqueue
> }
>
> How would I do this? If I simply do the examples above, I get the
> "cannot override local resource" error on the host which is in the
> queue_collect class.
>
> I would like to know how I could have many hosts export the
> "same" (as in identical) resource. Is this possible?
As with non-exported resources, you can't have multiple instances of
the same resource. How would it even make sense to have multiple
hosts trying to create the same file on a given machine? Who would win?
>
> Looking into the database (resources table), it becomes clear that
> every exporting host's resource is different, since it has different
> "host_id"s.
Their meaningful data (esp. the path) are the same.
>
> I have a similar problem with "Exec" resources, but ther I have the
> "onlyif" parameter with a test that prefents execution if the exec
> has already been applied on the collecting node. This is not
> possible for the File resources though.
>
> Could it be that exporting via @file{...} and collecting with
> realize(...) would solve this issue? I do not really understand the
> use of this approach, I must confess.
One '@' is virtual -- doesn't use Storeconfigs and doesn't allow
multiple hosts to have access to the resource. 'realize' is exactly
equivalent to a query like you're doing above, except for virtual
(rather than exported) resources.
--
The whole secret of life is to be interested in one thing profoundly
and in a thousand things well. -- Horace Walpole
---------------------------------------------------------------------
Luke Kanies | http://reductivelabs.com | http://madstop.com
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