Presentations on Chef (after OpenStack LA's Hackathon)


On Tuesday, August 21st, DreamHost is hosting a couple of Chef-specific presentations.  First up is Aaron:


Chef's New Existential Angst:  Exploring Whyrun Mode

Aaron J. Peterson - Consulting Technical Evangelist and Chef Instructor

"Whyrun" is a new feature in Chef - and is one of the oldest and most requested features - see CHEF-13 at - argued about and discussed often.  While similar to the concept of a "no-op" or "dry run" mode in other tools, it addresses some of the real concerns that arise when trying to "fake it".  To quote Dan DeLeo,

" addition to checking the state of the system and telling you what it would do, Chef now also has a system for providers to declare explicitly a set of assumptions they'll make about the system, and to inform the user when these assumptions don't hold..."

You not only see what Chef would do with a particular resource, but what it assumes earlier actions *should* do in order for that resource to succeed.

Interesting stuff, and we'll take it for a test drive.


There will also be a presentation by Carl Perry of DreamHost, but we'll fill in details later.


Deploying OpenStack Using Chef

Carl Perry - DreamHost Cloud Architect

(more details to come)

We're teaming up with our friends from OpenStack LA, who are hosting a OpenStack Cookbook Hackathon on the same day at the same Downtown location:

The presentations above start at about 6:30, after that Hackathon.

Chefs should attend both events!

Aaron Peterson may also hold a Chef training session (beginner-intermediate level) near the end of that week.  As above, we'll update with information as we get it.


(We still plan to hold our regular meetup on our regular day: Monday, August 27th.  We'll update if that changes and we make this event this month's only meetup.)


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  • Josh Baverstock

    Good overview of Chef's new why-run feature. Thanks.

    August 22, 2012

  • kelly

    Very good, not too in depth not to light.

    August 22, 2012

  • Aaron Peterson

    I am in fact holding a Chef 1-day intro workshop on Friday, August 24th over at the Culver City Nextspace, a coworking community space from 9-5. You can sign up here:­ and ask me questions at [masked]

    August 15, 2012

  • Gregory Horejsi

    Soo looking forward to this one!

    August 7, 2012

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