Am Freitag, 12. Juli 2013 17:03:11 UTC+2 schrieb Nan Liu:
>
> On Fri, Jul 12, 2013 at 7:45 AM, Christian Flamm
> <christian...@gmail.com<javascript:>
> > wrote:
>
>> Hi,
>> I'm having trouble understanding the added value Virtual Resources
>> provide. Let's say I'm having two different modules (that usually are
>> assigned to different agents) that both contain a common resource (let's
>> say a user). If I want to easily make it possible to assign both modules to
>> the same agent - without suffering from the "duplicate resource
>> declaration" error - I could make the resource definition virtual and
>> realize it in different modules. See this simplified example.
>>
>> > cat $modulesdir/virtual/manifests/init.pp
>> class virtual {
>> @user { 'admin': ensure => present }
>> }
>>
>> > cat $modulesdir/mailserver/manifests/init.pp
>> class mailserver {
>> realize(User['admin'])
>> # some more mailserver stuff...
>> }
>>
>> > cat $modulesdir/webserver/manifests/init.pp
>> class webserver {
>> realize(User['admin'])
>> # some more webserver stuff...
>> }
>>
>> > cat $manifestsdir/nodes.pp
>> node /<somenode>/ {
>> include virtual
>> include mailserver
>> include webserver
>> }
>>
>>
>> My question: How is that different, more convenient or more flexible than
>> extracting that admin user into its own module? Like that:
>>
>> > cat $modulesdir/adminuser/manifests/init.pp
>> class adminuser {
>> user { 'admin': ensure => present }
>> }
>>
>> > cat $modulesdir/mailserver/manifests/init.pp
>> class mailserver {
>> # some more mailserver stuff...
>> }
>>
>> > cat $modulesdir/webserver/manifests/init.pp
>> class webserver {
>> # some more webserver stuff...
>> }
>>
>> > cat $manifestsdir/nodes.pp
>> node /<somenode>/ {
>> include adminuser
>> include mailserver
>> include webserver
>> }
>>
>>
>> I guess I'm missing something here, or I'm using it wrong.
>> Your help is highly appreciated,
>>
>
> In this simple case no, but think of a vinn diagram with overlapping
> groups (such as user belonging to dbadmin/webadmin and two different teams
> of dbadmin webadmin). You can easily realize virtual resource by tags, but
> not so easy by splitting to class dbadmin/webadmin/db_and_webadmin ...
>
> HTH,
>
> Nan
>
Do you mean something like this?
> cat $modulesdir/virtual/manifests/init.pp
class virtual {
@user { ['a', 'b', 'c', 'd']: ensure => present }
}
> cat $modulesdir/mailserver/manifests/init.pp
class mailserver {
realize(User['a'], User['b'], User['c'])
# some more mailserver stuff...
}
> cat $modulesdir/webserver/manifests/init.pp
class webserver {
realize(User['b'], User['c'], User['d'])
# some more webserver stuff...
}
> cat $manifestsdir/nodes.pp
node /<somenode>/ {
include virtual
include mailserver
include webserver
}
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