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From Allen Wittenauer ...@effectivemachines.com>
Subject Re: Building with docker - Best practices
Date Tue, 14 Nov 2017 17:56:15 GMT

> On Nov 14, 2017, at 9:17 AM, Thomas Bouron <tbouron@apache.org> wrote:
> 
> 1. In Jenkins, rather than using a maven type job, I'm using a freestyle type job to
call `docker run .... ` during the build phase. Is it the right way to go?

	All of the projects I’m involved with only ever use freestyle jobs.  Soooo… :)

> 2. My docker images are based on `maven:alpine` with few extra bits and bobs on top.
All is working fine but, how do I configure jenkins to push built artifacts (SNAPSHOT) on
Apache maven repo? I'm sure other projects do that but couldn't figure it out so far.

	This is one of the few jobs that Apache Hadoop doesn’t have dockerized.  I think I know
what needs to happen (import the global maven settings) but I just haven’t gotten around
to building the bits around it yet.  I’ll probably write something up and add it to the
Apache Yetus toolbox.  

> 3. Each git submodule requiring a custom docker image will have their own `Dockerfile`
at the root. I was planning to create an extra jenkins job to build and publish those images
to docker hub. Does Apache has an official account and if yes, should we use that? Otherwise,
I'll create an account for our project only and share the credential with our PMCs.

	I’m personally not a fan of depending upon docker hub for images. I’d rather build the
images as part of the QA pipeline to verify they always work, and if the versions of bits
aren’t pinned, to test against the latest. This also allows the Dockerfile to get precommit
testing.

	It’s worth mentioning that all of the projects I’m involved with use Yetus to automate
a lot of this stuff.  Patch testing uses the same base images as full builds. So if your tests
run frequently enough, they’ll stay cached and the build time becomes negligible over the
course of the week.  

	As I work on getting the Yetus jenkins plug-in written, this will hopefully be dirt simple
for everyone to do without spending any time really learning Yetus.

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