Introduction to Cloud Computing 1 Ms. T.K.Anusuya,

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Introduction to Cloud Computing 1 Ms. T.K.Anusuya,

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Introduction to Cloud Computing 1 Ms. T.K.Anusuya, Asst. ProfCS, Bon Secours College for Women, Thanjavur. Defining Cloud Computing Buyya defines: Cloud is a parallel and distributed computing system consisting of a collection of

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Introduction to Cloud Computing 1 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Defining Cloud Computing Buyya defines:
Cloud 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)

• Vanquero defines:
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 2 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Cloud is a h/w based services offering compute, n/w and storage capacity where h/w management is highly abstracted from the buyer. Buyers incur infrastructure costs as variable OPEX, and infrastructure capacity is highly elastic
NIST-national institute of Standards & Technology characterise cc as “ as pay per use model for enabling available, convenient, on-demand n/w access to a shared pool of configurable computing resources. 3 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Roots of Cloud Computing Distributed Computing Hardware Internet Technologies Systems Management 4 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Internet Technologies Utility – Pay per use, elastic capacity, self service interface and virtualised
SOA – Service Oriented Architecture) software resources are packaged as a “ services” ook
WS – Powerful services that accessed on-demand, in a uniform way.
Service Mashups – web information and services may be programmatically aggregated, acting as a building blocks of complex compositions. Eg. Amazon, google, facebook. 5 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Computing Grid Computing
• aggregation of distributed resources
• transparently access
• Problems
• QoS, Lack of performance
• Availability, Virtualization
Utility Computing
• assign a “utility” value to users
• QoS constraints (deadline, importance, satisfaction) 6 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Hardware Virtualization Large scale data centers
Multiple OS and software stacks on a single physical platform
VMM-(Virtual machine monitor) also called hypervisor.
Workload migration also referred to as application mobility
VMM platforms exist that are the basis of many utility / cc environments. Eg. VMWare,Xen-hypervisor as a open source and KVM(Kernal based Virtual Machine) 7 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

8 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Autonomic Computing Autonomic or self-managing systems rely on monitoring probes and sensors (gauges) on an adaption engine and on effectors to carry out changes on the system.
IBM’s defines self configuration, self healing, self optimization and self protection. It is also called MAPE-K(Monitor Analyze Plan Execute-Knowledge). 9 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Layers and Types of Clouds 10 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

IaaS: Infrastructure as a Service
A cloud infrastructure enables on demand provisioning of servers running several choices of OS and a customized software stack.
It is considered as the bottom layer of cloud computing system.
Eg. Amazon Web Services mainly offers IaaS
PaaS: Platform as a Service
It is a higher level of abstraction to make a cloud easily .
Eg. Google AppEngine.
Data access, authentication and payments.
Python and java specific programming language 11 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

SaaS: software as a Service
Top of the cloud stack
On-line software services
Traditional desktop apps such as word and spreadsheet can now be access in the web.
Eg. Salesforce.com offers business productivityapplications(CRM) 12 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Deployment Models 13 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Desired Features of a Cloud This model satisfy expectations of consumers
Cloud offers
Self service
Per-Usage Metering and Billing
Elasticity
Customization 14 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Cloud Infrastructure Management The software toolkit responsible for this orchestration is called a VIM(virtual infrastructure manager)
This is a traditional OS
Two category of VIM
Toolkits that’s expose a remote and sevure interface for creating, controlling and monitoring virtualize resources.
Donot expose remote cloud like interfaces. 15 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Features of VIM Virtualization Support
Self service, on-demand resource provisioning
Multiple backend hypervisors
Storage virtualization
Interface to public clouds.
Virtual networking
Dynamic resource allocation
Virtual clusters 16 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Features of IaaS Geographic distribution of data centers
Variety of user interfaces and APIs to access the systems
Specialized components(firewalls)
Choice of virtualization platform and OS
Different billing methods
Post paid, prepaid
Hours, monthly 17 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Features of PaaS Programming Models, Languages, and Frameworks
Persistence Options 18 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Challenges and Risks Security, Privacy and Trust
Data Lock-in and standardization
Availability, fault tolerance and disaster recovery
Resource Management and Energy - Efficiency 19 Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur.

Ms. T.K.Anusuya, Asst. Prof/CS, Bon Secours College for Women, Thanjavur. 20

Introduction to Cloud Computing 1 Ms. T.K.Anusuya,

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