anchor.diff:  === Run rtiperftest
   [source,bash]
   ----
  -docker run --detach=true --name rti-perftest-pub guther/rti-perftest -pub -numSubscribers 1 -sleep 1000
  -docker run --detach=true --name rti-perftest-sub guther/rti-perftest -sub
  +docker run --detach=true --name pub guther/rti-perftest -pub -numSubscribers 1 -sleep 1000
  +docker run --detach=true --name sub guther/rti-perftest -sub
   ----
   
   === Demo
  
positive.code: ----
  $ vagrant init bento/centos-7.3
  $ vagrant up
  ----
  
  === Demo
  
negative.code: 
  [centos:vars]
  ansible_user=vagrant
  ansible_ssh_pass=vagrant
  ----
  
  === Execute Command
  [source,bash]
  ----
  $ export ANSIBLE_HOST_KEY_CHECKING=false
  $ ansible -i ./hosts all -a "/usr/sbin/ip addr"
  ----
  
  === Demo
  