On Friday, October 12, 2012 9:52:01 AM UTC-5, Nishant Jain wrote:
>
> Hello jcbollinger,
> I am actually trying to read the array into a
> variable and passsing that variable as the content of a file like below,
> file{'/tmp/nish_lat':
> ensure=>file,
> content=>hiera('users'),
> }
>
>
Yes, I gathered that from your earlier description. That directs Puppet to
manage a file /tmp/nish_lat on the client, whose content is the string
value of the object obtained by invoking hiera('users'). I inferred that
you were doing that to check the value hiera was returning, hence I
suggested a slightly less kludgy approach to that.
> My intention was to just get a way to read the array from
> a file, so that I can pass it to a define resource , where it can be used
> to create a no of resources, as there are no loops available in puppet.
>
If you mean that was the purpose of the File resource then you going in a
very wrong direction. Hiera itself is a way (a good one) to read an array
from a file, as it seemed you understood.
> I have tried using your method of notifying, but it sends out
> an error
> Error 400 on SERVER: Failed to parse inline template:
> undefined method `join' for nil:NilClass
>
That error message suggests that Puppet variable $users is unset or
explicitly set to nil. Either you missed the line that sets the $users
variable (to the value returned by "hiera('users')"), or you changed your
data or your hiera configuration, or you ran the test in a different
context than your earlier one.
>
> I am actually new to puppet and my work as of now is to be
> able to create a no of users on a machine based on the information passed
> to it from a file.
>
The very simplest form of doing that in Puppet would be something like this:
######
$users = hiera('users')
user { $users: }
######
That's far too simple for practical use, of course, but it demonstrates the
basic idea of obtaining data from an external file (via hiera, in that
case) and using it to declare possibly-multiple resources. There is also a
variation that loads data as a hash of hashes and uses the
create_resources() function instead of an explicit resource declaration:
######
$users_hash = hiera('user_data')
create_resources('user', $users_hash)
######
Anything else is an embellishment on one of those basic themes.
Note that managing the contents of a File resource cannot influence
anything about other resources included in the target node's catalog. The
catalog is compiled before any of its contents are applied (and on the
master in a master / client setup), and that determines all the resources
and their managed properties. I assumed you understood that, which is why
I interpreted your File resource as a test mechanism. If you didn't know
before then you do now.
John
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