Add ppc64le & multiarch support

[sdmonov]

This code is adding ppc64le and multiarch support for FfDL.

• Adds new make target to the main Makefile: docker-create-manifest
  that creates the multiarch manifests for the services.

• arch (architecture) parameter was added to values.yaml and
  storage-plugin/values.yaml

make docker-build will generate all the services with a -${ARCHITECTURE}
suffix. During build an ARCH argument is sent to the Dockerfiles in order
to have architecture specific implementation inside it.

Building docker images for ppc64le should look like this:

make docker-build
make docker-push
make docker-create-manifest
.....
helm install storage-plugin --set arch=ppc64le,namespace=$NAMESPACE
helm install . --set arch=ppc64le,lcm.shared_volume_storage_class=$SHARED_VOLUME_STORAGE_CLASS,namespace=$NAMESPACE

Fixes #115

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[sdmonov]

Hi All,

This code adds support for ppc64le in FfDL. It does adds a suffix to the built services with the architecture and also adds a target in the main Makefile to create/ammend the needed manifest lists to support the multiple architectures.

There are two services that are needed by the code prom/pushgateway and localstack/localstack (optional) that does not have a ppc64le version in the public registries. I did generate custom build ppc64le version and pushed it to my own registry smonov. They will be pulled from there for now until published on a more official registry.

[Tomcli]

This changes our official Docker image location.

[sdmonov]

Sorry my mistake. This was not supposed to be there. Will fix it.

[sdmonov]

Found few issues. Fixing and testing them now:

• fixed issue with the repository in the values.yaml reported by @Tomcli
• added new target to the Makefile: docker-tag-local. It will tag the arch dependent image name to arch independent name. For example: ffdl/ffdl-ui-ppc64le:v0.1.1 will be tagged to ffdl/ffdl-ui:v.0.1.1. This is used for local deployments only that do not require pushing to registry. make docker-push will push only the arch dependent images (with -${ARCHITECTURE} suffix) only and then a manifest lists will be created for these image to support multiarch (by invoking make docker-create-manifest).
• updated .travis.yml to invoke docker-tag-local.

[animeshsingh]

Thanks @sdmonov. What is the target for travis if any?

[seelam]

helm install storage-plugin --set arch=ppc64le,namespace=$NAMESPACE
What if you have a mixed x86, POWER cluster, what happens then?

Could we not put the multi-arch storage plugin in a private repo and use it?

The public travis ci is now multi-arch so you should do builds with it. I would like to see the changes in Travis.yaml file.

We have to deal with learner images... is that addressed in a different PR?

[sdmonov]

@seelam:

• About the storage plugin I totally agree with you we need to push multi-arch images and create a manifest list. I have no access to push images at the moment. If I can be given access (@animeshsingh) I can push both ppc64le and x86_64 images and create the manifest lists to support the multi-arch.
• at the moment travil.yml (as far as I can tell looking into it) is doing testing only. It is not pushing images to the repos
• learner images will go separate PR. will commit soon.