DevOps patterns to scale web applications using cloud services

This article was accepted to publication at SPLASH 2013Wavefront Experience track.

Scaling a web applications can be easy for simple CRUD software running when you use Platform as a Service Clouds (PaaS). But if you need to deploy a complex software, with many components and a lot users, you will need have a mix of cloud services in PaaS, SaaS and IaaS layers. You will also need knowledge in architecture patterns to make all these software components communicate accordingly.

In this article, we share our experience of using cloud services to scale a web application. We show usage examples of load balancing, session sharing, e-mail delivery, asynchronous processing, logs processing, monitoring, continuous deployment, realtime user monitoring (RUM). These are a mixture of development and system operations (DevOps) that improved our application availability, scalability and performance.
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Small EC2 cloud usage demo for choreographies

The CHOReOS middleware must be capable of providing the required runtime support to deploy, enact, monitor, and dynamically reconfigure large-scale choreographies. These choreographies might be large scale in one or more of the following dimensions: number of requests, users, roles, services, nodes, and communication among services. For instance, the middleware should be scalable enough to accommodate choreography with 1 thousand simultaneous users or with 100 different roles, or with 100 services for a given role, or with thousands of messages exchanged per second.

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Jango, Rails and RESTful – Integrating websites in 18 minutes and 18 lines of code.

Jango.com is one of the most incredible on-line radios I know and some time ago I decided to put Daniella Alcarpe songs on this site. Jango has many things that make artists life happier and easier: you pay Jango to play your songs to people who probably will like your song. For example, Daniella sings Brazilian Bossa Music, so in Jango I choosed to play her songs just for people who like this kind of music, people who listen to João Gilberto, Caetano Veloso, Chico Buarque and so on.

After songs starts playing, the artist starts to get fans. And they really come! With just 2 months of Jango, Daniella has almost 400 new fans, from all over the world.
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