Install Core 5.1 - Cannot Install Docker

I have made 4 attempts at installing both Zenoss 5.0 and 5.1.2 on Centos 7 and cannot seem to get passed the Docker part.

I had some trouble initially getting the btrfs setup but now passed that and whenever I try to load Zenoss it wants Docker 1.9.0 (the latest is 1.9.1).

I figured out how to download the older version of docker but then that install fails because it wants: docker-selinux.x86_64.

When I download that there is another dependency error.

I really want to use Zenoss but I have spent days on this! I have a pretty decent Linux background (a bit rusty) but no docker experience.

I never had issues with older versions of Zenoss.

Can someone throw a few hints my way on how to isntall any ver 5.X and get around any dependency issues.

Thanks!

cat > /etc/yum.repos.d/docker.repo <<-EOF
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF
yum clean all && yum makecache fast
yum install -y docker-engine-1.9.0