On Mon, Feb 14, 2011 at 4:14 AM, luke.bigum <luke.bi...@fasthosts.co.uk>wrote:
> Hi list (specifically Dan),
>
> I was interested in the snippet you provided in the recent thread
> "Collection and Realizing resources" and how it could be used to
> safely include both 'app' and 'db' class without causing a conflict in
> the user 'bob'. I can't quite see how that's possible, even using
> class inheritance and the plusignment operator, you'd run into trouble
> overriding the same resource twice (bob). How does the collection
> syntax help?
>
ah, those resources should have been virtual:
> Quoting Dan:
>
> We have only been teaching <| |> in the puppetmaster training as a way
> to
> realize virtual resources. We do not teach that it is possible to
> override
> attributes with this syntax as well: <| |> {} (at least in part b/c
> the
> implications/non-determinism terrify me) , and do not teach that it
> actually
> effects all resources.
>
> The common example from class is something like:
>
> class db::users {
>
should be @user { ['alice', 'bob']:
> user { ['alice', 'bob']:
> ensure => present,
> gid => 'dbadmin',
> }
>
> }
>
> class app::users {
>
should be @user { ['charlie', 'bob']:
> user { ['charlie', 'bob']:
> ensure => present,
> gid => 'webadmin',
> }
>
> }
>
> class app {
> User<| gid == 'webadmin' |>
> ...
>
> }
>
> class db {
> User<| gid == 'dbadmin' |>
> ...
>
> }
>
> also missing:
include app::users, db::users, db, app
> so that a machine can safely be a webserver and db server without
> conflict.
>
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