[augeas-devel] Augeas and Puppet : Can I do a 'augshell / augtool connection pool'?

[Aaron Lippold]

Hi,

Great tip. The CLIP folks - http://oss.tresys.com/projects/clip/browser/trunk/RHEL5.4 - and SecState folks - 

"David Lutterkort" <lutter at redhat.com> wrote:

>On Fri, 2010-08-06 at 15:39 -0400, Aaron Lippold wrote:
>> One thing I noticed about how the augeas integration works with puppet
>> is that upon the execution of the catalog on the system, every time I
>> have a module or code bit that using augeas, it loads a new augshell.
>> 
>> Is there a way that I could keep augshell/augtoo open for the live of
>> the puppet catalog execution so I am not paying the cost for augeas
>> start / stop.
>> 
>> I am thinking about this the same way you would for a webapp and the
>> database / sql executions and dbh.
>
>I am not sure where puppet is at in terms of maintaining objects for the
>lifetime of a catalog run (I know that years ago this was hard, but that
>may very well have changed)
>
>Conceptually, even if you have Augeas running during hte whole
>transaction, you'd still need to issue an aug_load before executing each
>resource, to make sure you don't have stale data in the tree.
>
>The main thing you'd be saving by caching is reparsing the lens
>definitions, which is pretty quick anyway. BTW, puppet does not fork an
>augtool process, it uses the Ruby bindings into libaugeas.
>
>The big overhead most people incur is that by default, Augeas reads
>pretty much any file under the sun, and most of those won't be used in
>any given puppet resource. So even though you're only
>changing /etc/hosts, Augeas still pulls in dozens of config files.
>
>To avoid that, I added 'lens' and 'incl' parameters to the puppet type a
>while ago. If you set these, Augeas will only read a specific file,
>avoiding most of the unnecessary overhead. So, you should say something
>like
>
>        augeas { add_a_host:
>          changes => "...",
>          lens => "Hosts.lns",
>          incl => "/etc/hosts"
>        }
>        
>in your manifests, and everything will be lightning fast, even without
>'connection pooling'.
>
>David
>
>

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