Heroku: Up and Running: 
Take full advantage of Heroku’scloud-based hosting services. This guide takes you through theinner workings of this PaaS platform and delivers practical advicefor architecting your application to work as efficiently aspossible. You’ll learn best practices for improving speedand throughput, solving latency issues, locating and fixingproblems if your application goes down, and ensuring yourdeployments go smoothly.
Category: PaaS
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O’Reilly Media book: Heroku: Up and Running
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Engine Yard acquires Orchestra PHP development – The H Open Source: News and Features
Engine Yard acquires Orchestra PHP development – The H Open Source: News and Features:
US-based Ruby on Rails Platform-as-a-Service specialist Engine Yard has acquired Orchestra, adding PHP applications to its offerings