[yocto] [layerindex-web] RFC: layer index docker fixes

[Konrad Scherer]

On 07/12/2018 02:34 AM, Paul Eggleton wrote:
> Hi Konrad
> 
> On Wednesday, 11 July 2018 7:03:28 PM CEST Konrad Scherer wrote:
>> I have attached a patch to reduce the layerindex-web image size further.
>> Docker image layers are like git objects and RUN commands can only hide
>> files, not remove them once they have been committed. The pip upgrade
>> caused the following 'pip install' to fail and was removed.
> 
> Right, overall you don't save any storage space with separate stages - but the
> downside of merging these is that you lose the ability to incrementally update
> the container within those stages; any time anything before changes the whole
> block will need to be re-run. Having said that we still have the separation
> between requirements.txt and everything else which is probably sufficient.
> 
> Oddly I did not see a failure from pip when I built this yesterday, but I
> guess it's probably not strictly necessary to upgrade it anyway.
> 
> I've pushed your patch to the paule/dockerfixes branch.

Thanks, I just noticed that the image doesn't contain git. Was this 
deliberate or an oversight?

>> I recommend docker-compose because much of the information in
>> docker/README can be captured in a compose yaml file. It handles the
>> network setup and makes managing shared volumes much simpler.
> 
> Right, we'd just need to make sure everything we now have in the README is
> covered by the compose file (everything that's practical to cover, anyway).

I am heading out on vacation soon. I will rework my docker-compose 
configuration with the new image and make some documentation when I get 
back.

-- 
Konrad Scherer, MTS, Linux Products Group, Wind River