anchor.diff:  container on a Docker Swarm (v.1.12) cluster.
   
   First, set up a cluster, the Kubernetes libvirt coreos cluster
  -example works well, see link:http://kubernetes.io/docs/getting-started-guides/libvirt-coreos/[coreos-libvirt-cluster]
  +example works well, see link:http://kubernetes.io/docs/getting-started-guides/libvirt-coreos/[coreos-libvirt-cluster.]
   
   Next, on each node, create the Swarm using these
  -link:https://docs.docker.com/engine/swarm/swarm-tutorial/create-swarm/[Swarm Install]
  +link:https://docs.docker.com/engine/swarm/swarm-tutorial/create-swarm/[Swarm Install instructions.]
   
   Includes the command on the manager node:
   ....
  
positive.code: container runs as the postgres user, so adjust the
  file permissions of /run/docker.sock accordingly.
  
  Run the example as follows, (depends on master-replica example
  being run prior):
  ....
  cd examples/docker/watch
  
negative.code: ....
  
  We want to have the master database always placed on
  a specific node. This is accomplished using node constraints
  as follows:
  ....
  docker node inspect kubernetes-node-1 | grep ID
  