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This is a guest post by Frédéric Faure (architect at Ysance), you can follow him on twitter.

Urbandive is an immersive view service launched by the French YellowPages which allows you to travel in cities in France thanks to a 360° view. Urbandive focuses on providing high definition pictures and accurate professional and social content. One of the biggest jobs was to enable a fast scalable architecture, because it was really difficult to forecast the traffic load at production time. Traffic load may be influenced if the service receives attention from users as a result of advertising.
Below you will find a summary of the goals we achieve by using a Ruby scheduler built on top of Puppet on AWS to create a complete infrastructure.