introduction to web technology and web application

introduction to web technology and web application

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  Cloud‐Enabling Technology 1
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  Enabling technologies 1. Broadbandnetworks and internet architecture 2. Data center technology 3. Virtualization technology 4. Web technology 5. Multitenant technology 2
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  1. Broadband networks& Internet architecture • All clouds must be connected to a network • Internet’s largest backbone networks, established and deployed by ISPs, are interconnected by core routers  ISP: internet service provider 3
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  Internet connecting providerand consumer 4
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  Two fundamental components •Connectionless packet switching  End‐to‐end (sender‐receiver pair) data flows are divided into packets of a limited size  Packets are processed through network switches and routers, then queued and forwarded from one intermediary node to the next • Router‐based interconnectivity  A router is a device that is connected to multiple networks through which it forwards packets  Each packet is individually processed  Use multiple alternative network routes 5
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  Packets travelling throughInternet 6
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  Internet reference model 7
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  2. Data CenterTechnology • A data center is a facility used to house computer systems and associated components, such as telecommunications and storage systems  Virtualization  Standardization and Modularity  Automation  Remote Operation and Management 8
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  Virtualization 9
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  Standardization and Modularity •Data centers are built upon standardized commodity hardware and designed with modular architecture. 10
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  Supercomputer vs. datacenter • Handouts 11
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  3. Virtualization technology •Virtualization is a process of converting a physical IT resource into a virtual IT resource  Server  Virtual server ↔ virtual machine  Storage  Network  Power 12
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  Creating a newvirtual server • Allocation of physical IT resources • Installation of an operating system, i.e., guest operating system 13
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  Hardware based virtualization •Reduce the overhead • May introduce compatibility issue 14
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  4. Web technology •Cloud computing relies on internet. • Web technology is generally used as both the implementation medium and the management interface for cloud services 15
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  Basic web technology •Uniform resource locator (URL)  Commonly informally referred to as a web address  a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it  Example: http://www.example.com/index.html • Hypertext transfer protocol (HTTP)  Primary communication protocol used to exchange content • Markup languages (HTML, XML)  Express Web‐centric data and metadata 16
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  Web applications • Applicationsrunning in a web browser  Rely on web browsers for the presentation of user‐ interfaces 17
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  5. Multitenant technology •Enable multiple users (tenants) to access the same application simultaneously • Multitenant applications ensure that tenants do not have access to data and configuration information that is not their own 18
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  A simple example 19