These notes are largely replaced by http://www.win-vector.com/blog/2018/01/setting-up-rstudio-server-quickly-on-amazon-ec2/ . However, they still have the points on how to get more than one machine communicating together.


Some related articles:
   http://www.win-vector.com/blog/2018/01/setting-up-rstudio-server-quickly-on-amazon-ec2/
   http://www.win-vector.com/blog/2016/01/parallel-computing-in-r/
   http://www.win-vector.com/blog/2016/01/running-r-jobs-quickly-on-many-machines/


See also: 
   https://github.com/raeed20/deploy-rstudio-server