K8S vhost deployment

1. Resources

blue-green deployment: https://techbeacon.com/devops/one-year-using-kubernetes-production-lessons-learned
https://bitbucket.org/amdatulabs/amdatu-kubernetes-deployer/src/master/
Brain dump: https://diginomica.com/kubernetes-and-misconception-multi-cloud-portability
docker proxy: https://www.digitalocean.com/community/tutorials/how-to-use-traefik-as-a-reverse-proxy-for-docker-containers-on-ubuntu-16-04