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From "Elek, Marton" <e...@apache.org>
Subject Re: proposed new repository for hadoop/ozone docker images (+update on docker works)
Date Wed, 30 Jan 2019 08:56:02 GMT
Thanks Eric the suggestions.

Unfortunately (as Anu wrote it) our use-case is slightly different.

It was discussed in HADOOP-14898 and HDDS-851 but let me summarize the

We would like to upload containers to the dockerhub for each releases
(eg: apache/hadoop:3.2.0)

According to the Apache release policy, it's not allowed, to publish
snapshot builds (=not voted by PMC) outside of the developer community.

1. We started to follow the pattern which is used by other Apache
projects: docker containers are just different packaging of the already
voted binary releases. Therefore we create the containers from the voted
releases. (See [1] as an example)

2. With separating the build of the source code and the docker image we
get additional benefits: for example we can rebuild the images in case
of a security problem in the underlying container OS. This is just a new
empty commit on the branch and the original release will be repackaged.

3. Technically it would be possible to add the Dockerfile to the source
tree and publish the docker image together with the release by the
release manager but it's also problematic:

  a) there is no easy way to stage the images for the vote
  b) we have no access to the apache dockerhub credentials
  c) it couldn't be flagged as automated on dockerhub
  d) It couldn't support the critical updates as I wrote in (2.).

So the easy way what we found is ask INFRA to register a branch to the
dockerhub to use for the image creation. The build/packaging will be
done by the dockerhub but only released artifacts will be included.
Because the limitation of the dockerhub to set a map between branch
names and tags, we need a new repository instead of the branch (see the
comments in HDDS-851 for more details).

We also have a different use case to build developer images to create a
test cluster. These images will never be uploaded to the hub. We have a
Dokcerfile in the source tree for this use case (see HDDS-872). And
thank you very much the hint, I will definitely check how YARN-7129 can
do it and will try to learn from it.


[1]: https://github.com/apache/hadoop/tree/docker-hadoop-3

On 1/30/19 2:50 AM, Anu Engineer wrote:
> Marton please correct me I am wrong, but I believe that without this branch it is hard
for us to push to Apache DockerHub. This allows for Apache account integration and dockerHub.
> Does YARN publish to the Docker Hub via Apache account?
> Thanks
> Anu
> On 1/29/19, 4:54 PM, "Eric Yang" <eyang@hortonworks.com> wrote:
>     By separating Hadoop docker related build into a separate git repository have some
slippery slope.  It is harder to synchronize the changes between two separate source trees.
 There is multi-steps process to build jar, tarball, and docker images.  This might be problematic
to reproduce.
>     It would be best to arrange code such that docker image build process can be invoked
as part of maven build process.  The profile is activated only if docker is installed and
running on the environment.  This allows to produce jar, tarball, and docker images all at
once without hindering existing build procedure.
>     YARN-7129 is one of the examples that making a subproject in YARN to build a docker
image that can run in YARN.  It automatically detects presence of docker and build docker
image when docker is available.  If docker is not running, the subproject skips and proceed
to next sub-project.  Please try out YARN-7129 style of build process, and see this is a possible
solution to solve docker image generation issue?  Thanks
>     Regards,
>     Eric
>     On 1/29/19, 3:44 PM, "Arpit Agarwal" <aagarwal@cloudera.com.INVALID> wrote:
>         I’ve requested a new repo hadoop-docker-ozone.git in gitbox.
>         > On Jan 22, 2019, at 4:59 AM, Elek, Marton <elek@apache.org> wrote:
>         > 
>         > 
>         > 
>         > TLDR;
>         > 
>         > I proposed to create a separated git repository for ozone docker images
>         > in HDDS-851 (hadoop-docker-ozone.git)
>         > 
>         > If there is no objections in the next 3 days I will ask an Apache Member
>         > to create the repository.
>         > 
>         > 
>         > 
>         > 
>         > LONG VERSION:
>         > 
>         > In HADOOP-14898 multiple docker containers and helper scripts are
>         > created for Hadoop.
>         > 
>         > The main goal was to:
>         > 
>         > 1.) help the development with easy-to-use docker images
>         > 2.) provide official hadoop images to make it easy to test new features
>         > 
>         > As of now we have:
>         > 
>         > - apache/hadoop-runner image (which contains the required dependency
>         > but no hadoop)
>         > - apache/hadoop:2 and apache/hadoop:3 images (to try out latest hadoop
>         > from 2/3 lines)
>         > 
>         > The base image to run hadoop (apache/hadoop-runner) is also heavily used
>         > for Ozone distribution/development.
>         > 
>         > The Ozone distribution contains docker-compose based cluster definitions
>         > to start various type of clusters and scripts to do smoketesting. (See
>         > HADOOP-16063 for more details).
>         > 
>         > Note: I personally believe that these definitions help a lot to start
>         > different type of clusters. For example it could be tricky to try out
>         > router based federation as it requires multiple HA clusters. But with a
>         > simple docker-compose definition [1] it could be started under 3
>         > minutes. (HADOOP-16063 is about creating these definitions for various
>         > hdfs/yarn use cases)
>         > 
>         > As of now we have dedicated branches in the hadoop git repository for
>         > the docker images (docker-hadoop-runner, docker-hadoop-2,
>         > docker-hadoop-3). It turns out that a separated repository would be more
>         > effective as the dockerhub can use only full branch names as tags.
>         > 
>         > We would like to provide ozone docker images to make the evaluation as
>         > easy as 'docker run -d apache/hadoop-ozone:0.3.0', therefore in HDDS-851
>         > we agreed to create a separated repository for the hadoop-ozone docker
>         > images.
>         > 
>         > If this approach works well we can also move out the existing
>         > docker-hadoop-2/docker-hadoop-3/docker-hadoop-runner branches from
>         > hadoop.git to an other separated hadoop-docker.git repository)
>         > 
>         > Please let me know if you have any comments,
>         > 
>         > Thanks,
>         > Marton
>         > 
>         > 1: see
>         > https://github.com/flokkr/runtime-compose/tree/master/hdfs/routerfeder
>         > as an example
>         > 
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