Michael P. McGrath - Understanding PaaS
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Copyright 2012 Michael McGrath
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For years, I worked as the Fedora Projects infrastructure team lead. It was quite possibly the best job Ill ever have. People were constantly coming up with new ideas and as the keeper of resources, theyd come to the infrastructure team to put those ideas into motion. Looking back, I have regret. Its about how many of those ideas I had to say no to just because there werent enough people or servers to go around. So many projects just never got off the ground because of the high cost of innovation.
With all those never born projects in mind, I joined Red Hats cloud computing initiative to make OpenShift a reality. OpenShift is Red Hats Platform as a Service (PaaS) offering and its the answer to so many problems Ive had in the past, like those Fedora Project ideas that never got off the ground.
Yet, even months after OpenShift launched, I am constantly surprised how often people would ask me what PaaS is. Is it virtualization? Is it just cloud computing? Why would I use it? This book is the result of the questions so many people have asked me at conferences, on IRC, and via email. So to all of you curious and hardworking inventors out there, thank you. I hope the answers contained in this book will help you innovate even better.
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Cloud computing is a funny business. The term itself is sometimes derided by technical professionals as meaningless. Yet, companies of all sizes, from the largest enterprises to small start-ups, are taking a serious look at it. Even the luddites are taking notice. So what is cloud computing? Why is it here? Perhaps most importantly, how much does it cost? These are all topics covered in this book. The focus is on how to utilize the cloud as a tool, not how to create and operate a private cloud.
At a high-level view, cloud computing provides a way for developers to focus exclusively on coding. It provides a way for systems engineers to finally offload some of the projects that have crept up over the years and continue to plague their time. With cloud technologies, architects can quickly prototype new technologies with minimum commitment and cost. These same technologies allow executives to better control and predict cost as well as remove much of the waste created by traditional computing. The differences between traditional computing and cloud computing are nuanced but many.
The rest of this chapter discusses the differences between the three primary cloud computing areas: Software as a Service (SaaS), Infrastructure as a Service (IaaS), and Platform as a Service (PaaS), pronounced sass, pass, and i-a-a-s, respectively. Keep in mind that the field is new and changing. Rapid innovation of this kind causes the lines between IaaS, PaaS, and SaaS to blur, sometimes significantly. It wont always be obvious whether something is PaaS or IaaS but the difference between them isnt nearly as important as understanding the concepts of how to properly utilize these technologies.
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