[openstack-dev] [kolla] Google Hangouts discussion for dueling specifications for Dockerfile customization

Ihor Dvoretskyi idvoretskyi at mirantis.com
Fri Jun 3 10:00:33 UTC 2016


If you have any concerns with recording the Hangouts meetings, we may try
to run Zoom for that.

On Fri, Jun 3, 2016 at 3:50 AM, Steven Dake (stdake) <stdake at cisco.com>

> Hey folks,
> IRC and mailing list were going far too slow for us to make progress on
> the competing specifications for handling Dockerfile customization.
> Instead we held a hangout, which I don't like because it isn't recorded,
> but it is high bandwidth and permitted us to work through the problem in 1
> hour instead of 1 month.
> The essence of the discussion:
>    1. I will use inc0's patch as a starting point and will do the
>    following:
>       1. Prototype base with <block> operations using the specification
>       items in the elemental DSL
>       2. Prototype mariadb with <block> operations using the
>       specification items in the elemental DSL
>       3. I will create a document assuming these two prototypes work that
>       describe how to use the jinja2 <block> operations to replace or merge
>       sections of Dockerfile.j2 files.
>       4. We will stop specification development as it has served its
>       purpose (of defining the requirements) assuming the prototypes meet
>       people's taste test
>    2. We believe the Jinja2 <block> operation will meet the requirements
>    set forth in the original elemental DSL specification
>    3. We as a community will need to modify our 115 dockerfiles, of which
>    I'd like people to take 1 or 2 container sets each (40 in total), in a
>    distributed fashion to implement the documentation described in section 1.3
>    4. We will produce an optional DSL parser (based upon the prototyping
>    work) that outputs the proper <block> Dockerfile.j2 files or alternatively
>    operators can create their own block syntax files
>    5. All customization will be done in one master block replacement file
>    6. Original dockerfile.j2 files will stay intact with the addition of
>    a bunch of block operations
>    7. Some RUN layer compression will be lost (the && in our Dockerfiles)
>    8. There are 8 DSL operations but we will need twice as many to handle
>    both override and merging in a worst case scenario.  That means 16 blocks
>    will need to be added to each Dockerfile.
>    9. Operators that have already customized their Dockerfile.j2 files
>    can carry those changes or migrate to this new customization technique when
>    this feature hits Newton, up to them
>    10. If the prototypes don't work, back to the drawing board – that
>    said I am keen to have any solution that meets the requirements so I will
>    do a thorough job on the prototypes of inc0's work
> If you have questions, or I missed key points, please feel fee to ask or
> speak up.
> Regards
> -steve
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Best regards,

Ihor Dvoretskyi,
OpenStack Operations Engineer


Mirantis, Inc. (925) 808-FUEL
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