M.A.Doman 2011. Model for enabling the delivery of computing as a SERVICE.

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Presentation transcript:

M.A.Doman 2011

Model for enabling the delivery of computing as a SERVICE.

1. On-demand self-service 2. Broad network access 3. Resource pooling 4. Rapid elasticity 5. Measured service

NIST Definition Software as a Service Platform as a Service Infrastructure as a Service

NIST Definition * Public Cloud * Private Cloud * Hybrid Cloud * Community Cloud

IaaS is the delivery of computer hardware as a service Servers Networks Storage Think of IaaS as the maturation of ISP model. Including: Virtualization Migration Well-defined self-service management

VIM: Virtualization Infrastructure Management Manage the physical and virtual resources in a holistic fashion. Rapidly and dynamically provision resources to applications H Web Server DB Server WindowLinux Facebook app DB Java Guest OS App A App B App C HOST Virtual Machine Monitor (Hypervisor) HARDWARE

Migration services is the process of moving a virtual machine from one host server or storage location to another. All key machine’s components, CPU, storage disks, networking and memory are completely virtualized. This facilitates the entire state of the virtual machine that must be captured and moved. Various techniques: * Live (hot or real time) migration : VM is powered on * Regular (cold) migration: VM is powered off * Live Storage migration

VM

Switch Bridge Virtual LAN Internet Bridge 02:01:0A:00:01: /24 02:01:0A:00:02: /24 02:01:93:60:51:f ,81,241/24 From Cloud Computing: Principles and Paradigms 02:01:0A:00:02: /24 02:01:0A:00:01: /24 Virtual LAN PUBLIC ACCESS vm Host A Host B vm

There isn’t one approach to PaaS. The line between Iaas and Paas is blurred Common PaaS Characteristics: * Offers development environment Development lifecycle, language Ability to develop, test and deploy applications Customer uses this to add value * Support well-defined interfaces for: * Composite applications * Portals * Mashups (brings together 2 or more business apps) * Based on multi-tenancy architecture

Provides customer a full environment for creating an application without buying individual tools. Often includes * Workflow engine * Development tools * Testing environment * Database integration * Third party tools and services Examples: Google App Engine, Microsoft Asure

Contain most of the same characteristics as integrated lifecycle platform AND Include a packaged business solution at the core. Ex. Intuit’s Quickbooks Provides a specialized capability, such as a tool or tool set Ex. Amazon’s Simple DB and Simple Query Service

30 years ago…… Time-sharing systems ….. SaaS model today motivated by Faster, ubiquitous networked communications Software costs and complexities IT costs

Clouds have the same security issues as server technologies. Some other issues: XML Signatures Browser Security Flooding Reputation Fate Sharing Loosing control over date Dependence on the internet See paper: “Who can you trust in the cloud?” Roberts, Al-Hamdani