Cloud Computing


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Presentation used for workshop on Cloud Computing as a part of Software Freedom Day 2009 Celebrations at National Institute of Technology, Tiruchirappalli, India

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Cloud Computing

  1. 1. Cloud Computing Fundamentals<br />1<br />24/9/2009<br />Software Freedom Day - 2009<br />
  2. 2. The hype<br />Cluster Computing<br />Cloud Computing<br />Grid Computing <br />2<br />24/9/2009<br />Software Freedom Day - 2009<br />
  3. 3. 3<br />24/9/2009<br />Software Freedom Day - 2009<br />
  4. 4. DEFINITIONS<br />4<br />24/9/2009<br />Software Freedom Day - 2009<br />
  5. 5. DEFINITIONS<br />.. moving computing and data away from the desktop and the portable PC and simply displaying the results of computing that takes place in a centralized location and is then transmitted via the internet on the user&apos;s screen ..<br /> - John Makroff<br />.. a computing paradigm shift where computing is moved away from personal computers or an individual application server to a &quot;cloud&quot; of computers .. <br /><ul><li> Wikipedia</li></ul>.. the idea of relying on Web-based applications and storing data in the &quot;cloud&quot; of the internet ..<br />- MIT Technology Review<br />.. the cloud is a smart, complex, powerful computing system in the sky that people can just plug into ..<br />- Marc Andreessen<br />5<br />24/9/2009<br />Software Freedom Day - 2009<br />
  6. 6. Cloud computing comes into focus only when you think about what IT always needs: a way to increase capacity or add capabilities on the fly without investing in new infrastructure, training new personnel, or licensing new software. Cloud computing encompasses any subscription-based or pay-per-use service that, in real time over the Internet, extends IT’s existing capabilities.<br />6<br />24/9/2009<br />Software Freedom Day - 2009<br />
  7. 7. <ul><li> Common, Location-independent, Online Utility on Demand
  8. 8. Common implies multi-tenancy, not single or isolated tenancy
  9. 9. Utility implies pay-for-use pricing
  10. 10. onDemand implies ~infinite, ~immediate, ~invisible scalability
  11. 11. Alternatively, a “Zero-One-Infinity” definition:</li></ul>0On-premise infrastructure Acquisition cost Adoption cost Support cost<br />1Coherent and resilient environment – not a brittle “software stack”<br />Scalability in response to changing needIntegrability/Interoperability with legacy assets and other services Customizability/Programmability from data, through logic, up into the user interface without compromising robust multi-tenancy <br />7<br />24/9/2009<br />Software Freedom Day - 2009<br />
  12. 12. The on-demand, self-service, pay-by-use model<br />Infrastructure is programmable<br />Applications are composed and are built to be composable<br />Services are delivered over the network<br />8<br />24/9/2009<br />Software Freedom Day - 2009<br />
  13. 13. Cloud Computing Infrastructure Models<br />9<br />24/9/2009<br />Software Freedom Day - 2009<br />
  14. 14. DEPLOYMENT MODELS<br />Private Cloud<br />Public Cloud<br />Hybrid Cloud<br />Public clouds are run by third parties, and applications from different customers are likely to be mixed together on the cloud’s servers, storage systems, and networks. Public clouds are most often hosted away from customer premises, and they provide a way to reduce customer risk and cost by providing a flexible, even temporary extension to enterprise infrastructure.<br />10<br />24/9/2009<br />Software Freedom Day - 2009<br />
  15. 15. DEPLOYMENT MODELS<br />Private Cloud<br />Public Cloud<br />Hybrid Cloud<br />Private clouds are built for the exclusive use of one client, providing the utmost control over data, security, and quality of service. The company owns the infrastructure and has control over how applications are deployed on it. Private clouds may be deployed in an enterprise datacenter, and they also may be deployed at a co-location facility.<br />11<br />24/9/2009<br />Software Freedom Day - 2009<br />
  16. 16. DEPLOYMENT MODELS<br />Private Cloud<br />Public Cloud<br />Hybrid Cloud<br />Hybrid clouds combine both public and private cloud models. They can help to provide on-demand, externally provisioned scale. The ability to augment a private cloud with the resources of a public cloud can be used to maintain service levels in the face of rapid workload fluctuations. A hybrid cloud also can be used to handle planned workload spikes. Sometimes called “surge computing,” a public cloud can be used to perform periodic tasks that can be deployed easily on a public cloud.<br />12<br />24/9/2009<br />Software Freedom Day - 2009<br />
  17. 17. Architectural Layers of Cloud Computing<br />13<br />24/9/2009<br />Software Freedom Day - 2009<br />
  18. 18. Software as a service (SaaS)<br />Software as a service features a complete application offered as a service on demand. A single instance of the software runs on the cloud and services multiple end users or client organizations.<br />14<br />24/9/2009<br />Software Freedom Day - 2009<br />
  19. 19. Software as a service (SaaS)<br />15<br />24/9/2009<br />Software Freedom Day - 2009<br />
  20. 20. Platform as a service (PaaS)<br />Platform as a service encapsulates a layer of software and provides it as a service that can be used to build higher-level services.<br />Someone producing PaaSmight produce a platform by integrating an OS,middleware, application software, and even a development environment that is then provided to a customer as a service<br />Someone using PaaSwould see an encapsulated service that is presented to them through an API. The customer interacts with the platform through the API, and the platform does what is necessary to manage and scale itself to provide a given level of service.<br />16<br />24/9/2009<br />Software Freedom Day - 2009<br />
  21. 21. Platform as a service (PaaS)<br />17<br />24/9/2009<br />Software Freedom Day - 2009<br />
  22. 22. Infrastructure as a service (IaaS)<br />Infrastructure as a service delivers basic storage and compute capabilities as standardized services over the network. Servers, storage systems, switches, routers, and other systems are pooled and made available to handle workloads that range from application components to high-performance computing applications.<br />18<br />24/9/2009<br />Software Freedom Day - 2009<br />
  23. 23. Infrastructure as a service (IaaS)<br />19<br />24/9/2009<br />Software Freedom Day - 2009<br />
  24. 24. 20<br />24/9/2009<br />Software Freedom Day - 2009<br />
  25. 25. SINGLE TENANT vs. MULTI-TENANT ARCHITECTURE<br />Shared infrastructure<br />Other apps<br />App 1<br />App 2<br />App 3<br />App Server<br />App Server<br />App Server<br />Database<br />Database<br />Database<br />OS<br />OS<br />OS<br />Server<br />Server<br />Server<br />Storage<br />Storage<br />Storage<br />Network<br />Network<br />Network<br />Single tenancy gives each customer a dedicated software stack – and each layer in each stack still requires configuration, monitoring, upgrades, security updates, patches, tuning and disaster recovery.<br />On a multi-tenant platform, all applications run in a single logical environment: faster, more secure, more available, automatically upgraded and maintained. Any improvement appears to all customers at once.<br />21<br />24/9/2009<br />Software Freedom Day - 2009<br />
  26. 26. CLOUD COMPUTING CHARACTERISTICS<br />Cloud computing often leverages:<br />Massive scale<br />Virtualization<br />Non-stop computing<br />Free software<br />Geographic distribution<br />Service oriented software <br />Autonomic computing<br />Advanced security technologies<br />22<br />24/9/2009<br />Software Freedom Day - 2009<br />
  27. 27. TRADITIONAL SOFTWARE PURCHASE<br />Purchase software<br />Purchase hardware<br />Find space in data center<br />Create migration plan<br />Setup development & test<br />Configure systems<br />Configure databases<br />Configure networks<br />more… <br />CLOUD COMPUTING – THE EASY WAY<br />Get a login<br />23<br />24/9/2009<br />Software Freedom Day - 2009<br />
  28. 28. CLOUD COMPUTING BENEFITS<br />Reduce run time and response time<br />For applications that use the cloud essentially for running batch jobs, cloud computing makes it straightforward to use 1000 servers to accomplish a task in 1/1000 the time that a single server would require<br />Minimize infrastructure risk<br />When pushing an application out to the cloud, scalability and the risk of purchasing too much or too little infrastructure becomes the cloud provider’s issue<br />Lower cost of entry<br />Because infrastructure is rented, not purchased, the cost is controlled, and the capital investment can be zero.<br />Increased pace of innovation<br />The low cost of entry to new markets helps to level the playing field, allowing start-up companies to deploy new products quickly and at low cost.<br />24<br />24/9/2009<br />Software Freedom Day - 2009<br />
  29. 29. GOALS OF CLOUD COMPUTING<br />Scalability<br />Availability<br />Reliability<br />Security<br />Flexibility and agility<br />Serviceability<br />Efficiency<br />25<br />24/9/2009<br />Software Freedom Day - 2009<br />
  30. 30. IS THIS GRID COMPUTING ?<br />26<br />24/9/2009<br />Software Freedom Day - 2009<br />
  31. 31. CLUSTERS<br />A computer cluster is a group of linked computers, working together closely so that in many respects they form a single computer. The components of a cluster are commonly, but not always, connected to each other through fast local area networks. Clusters are usually deployed to improve performance and/or availability over that of a single computer, while typically being much more cost-effective than single computers of comparable speed or availability<br />High-availability (HA) clusters<br />Load-balancing clusters<br />Compute clusters<br />27<br />24/9/2009<br />Software Freedom Day - 2009<br />
  32. 32. GRID COMPUTING<br />Grid computing (or the use of computational grids) is the combination of computer resources from multiple administrative domains applied to a common task, usually to a scientific, technical or business problem that requires a great number of computer processing cycles or the need to process large amounts of data.<br />One of the main strategies of grid computing is using software to divide and apportion pieces of a program among several computers, sometimes up to many thousands. Grid computing is distributed, large-scale cluster computing, as well as a form of network-distributed parallel processing<br />28<br />24/9/2009<br />Software Freedom Day - 2009<br />
  33. 33. CLOUD COMPUTING vs. GRID COMPUTING<br />Grid computing has been used in environments where users make few but large allocation requests<br />Cloud computing really is about lots of small allocation requests.<br />29<br />24/9/2009<br />Software Freedom Day - 2009<br />
  34. 34. CLOUD COMPUTING vs. GRID COMPUTING<br />Grid computing has been used in environments where users make few but large allocation requests<br />Cloud computing really is about lots of small allocation requests.<br />30<br />24/9/2009<br />Software Freedom Day - 2009<br />
  35. 35. DISADVANTAGES OF CLOUD COMPUTING<br />Stored data might not be secure: With cloud computing, all your data is stored on the cloud. How secure is the cloud? Can unauthorized users gain access to your confidential data? Cloud computing companies say that data is secure, but it&apos;s too early in the game to be completely sure of that. <br />Dependent on internet connection: Internet connectivity isn’t completely stable and reliable. For cloud computing to be completely accessible anywhere, we’ll probably need to wait a few more years for the internet service providers to step up to the plate.<br />It’s not platform agnostic: Most clouds force participants to rely on a single platform or host only one type of product.  If you need to support multiple platforms, as most enterprises do, then you’re looking at multiple clouds. That can be a nightmare to manage.<br />Can be slow: Even on a fast connection, web-based applications can sometimes be slower than accessing a similar software program on your desktop PC. <br />31<br />24/9/2009<br />Software Freedom Day - 2009<br />
  36. 36. 32<br />24/9/2009<br />Software Freedom Day - 2009<br />
  37. 37. Thank you<br />33<br />24/9/2009<br />Software Freedom Day - 2009<br />