cloud computing, principle and paradigms: 1 introdution

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cloud computing: Principle and Paradigms, Buyya

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Cloud Computing

Cloud ComputingPrinciple and Paradigms31 January 20131Cloud ComputingPresented by Majid HajibabaPrefaceinformation processing can be done more efficiently centrally, on large farms of computing and storage systems accessible via the Internet.clouds are the natural evolution of traditional data centersOffer subscription-based access to infrastructure(IaaS), platforms(PaaS), and applications(SaaS)many open research problems31 January 20132Cloud ComputingPresented by Majid HajibabaBook ContentFoundationsIntroduction to cloud computingInfrastructure as a Service (IaaS )Platform and Software as a Service (PaaS/SaaS)Monitoring and ManagementApplicationsGovernance and Case Studies31 January 20133Cloud ComputingPresented by Majid Hajibaba3Cloud Computing: In a Glance

31 January 20134Cloud ComputingPresented by Majid Hajibaba1.Introduction To Cloud computingElectric PowerVirtualizemeans delivering useful functions while hiding how their internals workCluster, grid, cloudaccess to large amounts of computing power in a fully virtualized manner, by aggregating resources and offering a single system viewDelivering Computing as a utilityOn-demandPay-as-you-goService provider (Amazon, Google)Computing infrastructure (Cloud)Access from anywhereAs a service

31 January 20135Cloud ComputingPresented by Majid HajibabaTechnologies such as cluster, grid, and now, cloud computing, have all aimed at allowing access to large amounts of computing power in a fully virtualized manner, by aggregating resources and offering a single system view.5DefiningBuyyaCloud is a parallel and distributed computing system consisting of a collection of inter-connected and virtualized computers that are dynamically provisioned and presented as one or more unified computing resources based on service-level agreements (SLA)

Vanqueroclouds are a large pool of easily usable and accessible virtualized resources (such as hardware, development platforms and/or services). These resources can be dynamically reconfigured to adjust to a variable load (scale), allowing also for an optimum resource utilization.31 January 20136Cloud ComputingPresented by Majid HajibabaBuyya : Cloud is a parallel and distributed computing system consisting of a collection of inter-connected and virtualised computers that are dynamically provisioned and presented as one or more unified computing resources based on service-level agreements (SLA) established through negotiation between the service provider and consumers.Vaquero :clouds are a large pool of easily usable and accessible virtualized resources (such as hardware, development platforms and/or services). These resources can be dynamically reconfigured to adjust to a variable load (scale), allowing also for an optimum resource utilization.6DefiningMcKinseyClouds are hardware based services offering compute, network, and storage capacity where: Hardware management is highly abstracted from the buyer, buyers incur infrastructure costs, and infrastructure capacity is highly elastic

Berkeleycharacteristics of cloud computing as(1) the illusion of infinite computing resources(2) the elimination of an up-front commitment by cloud users(3) the ability to pay for use . . . as needed . . .

31 January 20137Cloud ComputingPresented by Majid HajibabaMcKinsey : Clouds are hardware based services offering compute, network, and storage capacity where: Hardware management is highly abstracted from the buyer, buyers incur infrastructure costs as variable OPEX, and infrastructure capacity is highly elastic.Berkeley : summarized the key characteristics of cloud computing as: (1) the illusion of infinite computing resources; (2) the elimination of an up-front commitment by cloud users; and (3) the ability to pay for use . . . as needed . . .

7DefiningNISTa pay-per-use model for enabling available, convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction

ArmbrustData center hardware and software that provide services.

SotomayorIT infrastructure deployed on an Infrastructure as a Service provider data center31 January 20138Cloud ComputingPresented by Majid Hajibaba(NIST) characterizes cloud computing as . . . a pay-per-use model for enabling available, convenient, on-demand network access to a shared pool of configurable computing resources (e.g. networks, servers, storage, applications, services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.In a more generic definition, Armbrust define cloud as the data center hardware and software that provide services. Similarly, Sotomayoret al. [7] point out that cloud is more often used to refer to the IT infrastructure deployed on an Infrastructure as a Service provider data center.8Common CharacteristicCloud should have(i) pay-per-use (no ongoing commitment, utility prices)(ii) elastic capacity and the illusion of infinite resources(iii) self-service interface(iv) virtualized (abstracted) resources

The ultimate goal is allowing customers to run their everyday IT infrastructure in the cloud.

31 January 20139Cloud ComputingPresented by Majid HajibabaWhile there are countless other definitions, there seems to be common characteristics between the most notable ones listed above, which a cloudshould have: (i) pay-per-use (no ongoing commitment, utility prices); (ii) elastic capacity and the illusion of infinite resources; (iii) self-service interface; and(iv) resources that are abstracted or virtualised.

The ultimate goal is allowing customers to run their everyday IT infrastructure in the cloud.9

Roots of Cloud Computing31 January 201310Cloud ComputingPresented by Majid HajibabaWe can track the roots of clouds computing by observing the advancement of several technologies, especially in hardware (virtualization, multi-core chips),Internet technologies (Web services, service-oriented architectures, Web 2.0), distributed computing (clusters, grids), and systems management (autonomiccomputing, data center automation).10Internet TechnologiesWeb Serviceapplications running on different messaging product platformsenabling information from one application to be made available to othersenabling internal applications to be made available over the InternetSOAaddress requirements of loosely coupled, standards-based, and protocol-independent distributed computingWS ,HTTP, XML Common mechanism for delivering serviceapplications is a collection of services that together perform complex business logic Building block in IaaSUser authentication, payroll management, calender

31 January 201311Cloud ComputingPresented by Majid HajibabaWeb services can glue together applications running on different messaging product platforms enabling information from one application to be made available to others, and enabling internal applications to be made available over the Internet.

WS standards have been created on top of existing ubiquitous technologies such as HTTP and XML, thus providing a common mechanism for deliveringservices, making them ideal for implementing a service-oriented architecture (SOA). The purpose of a SOA is to address requirements of loosely coupled,standards-based, and protocol-independent distributed computing. In a SOA, software resources are packaged as services, which

An enterprise application that follows the SOA paradigm is a collection of services that together perform complex business logic 11Distributed ComputingGrid Computingaggregation of distributed resources transparently accessProblemsQoS, Lack of performanceAvailability, VirtualizationUtility Computingassign a utility value to usersQoS constraints (deadline, importance, satisfaction)

31 January 201312Cloud ComputingPresented by Majid HajibabaGrid computing enables aggregation of distributed resources and transparently access to them.

ensuring QoS in grids has been perceived as a difficult endeavor [19]. Lack of performance isolation has prevented grids adoption in a variety of scenarios, especially on environments where resources are oversubscribed or users are uncooperative.

Another issue that has lead to frustration when using grids is the availability of resources with diverse software configurations

In utility computing environments, users assign a utility value to their jobs, where utility is a fixed or time-varying valuation that captures variousQoS constraints (deadline, importance, satisfaction).12HardwareHardware Virtualizationovercome most operational issues of data center building and maintenanceimproving sharing and utilization of computer systems running multiple operating systems and software stacks on a single physical platformvirtual machine monitor (VMM)mediates access to the physical hardwarepresenting to guest operating system a virtual machine (VM)is a set of virtual platform interfaces31 January 201313Cloud ComputingPresented by Majid Hajibabahardware virtualization can be considered as a perfect fit to overcome most operational issues of data center building and maintenance.

As depicted in Figure 1.2, a software layer, the virtual machine monitor (VMM), also called a hypervisor, mediates access to the physical hardware presenting to each guest operating system a virtual machine (VM), which is a set of virtual platform interfaces [22].13Virtualization

31 January 201314Cloud ComputingPresented by Majid HajibabaVirtualizationCapabilitiesWorkload isolationsecurityReliabilityPerformance ??Utilization Workload migrationLoad balancingDisaster recoveryWMM exampleVMWare ESXi, KVM, Xen31 January 201315Cloud ComputingPresented by Majid HajibabaWorkload isolation is achieved since all program instructions are fully confined inside a VM, which leads to im