I think it would be reasonably possible to use "user supplied instance data" http://docs.amazonwebservices.com/AWSEC2/latest/DeveloperGuide/index.html?AESDG-chapter-instancedata.html to allow the slaves to know which user to connect as.
I think it would be reasonably possible to use "user supplied instance data" http:// docs.amazonwebs ervices. com/AWSEC2/ latest/ DeveloperGuide/ index.html? AESDG-chapter- instancedata. html to allow the slaves to know which user to connect as.