Auto scaler

[nuno-silva]

use an Amazon AWS Autoscaling group that adaptively decides how many web server nodes should be active at any given moment. It is up to the students the challenge to design the autoscaling rules that will provide the best balance between performance and cost. It should detect that the web app is overloaded and start new instances and, conversely, reduce the number of nodes when the load decreases.

The algorithms for load balancing, auto-scaling and the MSS need not be fully implemented at this stage (metrics can be stored temporarily in the computing nodes) but should be already thought out.