Support for CoreOS

[kerneltime]

This involves

• publishing the plugin as docker images

• document and/or automate as far as possible the deployment of plugin on core os.

[pdhamdhere]

Did following to use vSphere Docker Volume service on CoreOS.

• Build vSphere Docker Volume Service container from latest release (Thanks to @kerneltime )

cat Dockerfile 
FROM ubuntu:16.04

RUN apt-get -y update && apt-get -y install rpm2cpio cpio 
ADD https://github.com/vmware/docker-volume-vsphere/releases/download/0.8.1/docker-volume-vsphere-0.8.1-1.x86_64.rpm /
RUN rpm2cpio docker-volume-vsphere-0.8.1-1.x86_64.rpm | cpio -idmv
CMD /usr/local/bin/docker-volume-vsphere -port 1019 -log_level=debug

docker build -t dvs -f Dockerfile .

• Configure Docker to use shared mount: Create /etc/systemd/system/docker.service.d/slave-mount-flags.conf and add following

[Service]
MountFlags=shared

• systemctl daemon-reload
• systemctl restart docker
• Launch vSphere Docker Volume Service Container

sudo docker run --restart=always --name dvs --privileged -d \
                            -v /var/run/docker/plugins/:/var/run/docker/plugins/ \
                            -v /run/docker/plugins/:/run/docker/plugins/ \
                            -v /var/run/docker.sock:/var/run/docker.sock \
                            -v /dev:/dev \
                            -v /mnt:/mnt:shared \
                            dvs    

*We may have to bind mount folders required for configuration & logging.

[kerneltime]

Relevant: moby/moby#20656 & https://groups.google.com/forum/#!topic/kubernetes-sig-storage/XPhpTHTBIxU

[pdhamdhere]

Will be fixed with #886

[shuklanirdesh82]

closing as per #730 (comment)