Presentation 32 - Copy

8/7/2019 Presentation 32 - Copy

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hat is Virtualization?

Virtualization is a method of logical partitioning

of a physical computing system into multiple ,virtual computing system giving each theappearance and capabilities of running on its own

.dedicated machine Each virtual computing systemcan be independently rebooted and behaves likehost machine and can similarly run application on

.it


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bout Virtualization

.NE MONITOR OR HYPERVISOR The VMM presents to each guest OS a set of vi


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ypes Of Hypervisor or VMM- :visor - , . . ,A hyper visor running on bare metal hardware e g Linux KVM VMware ES

hat runs as an application within a host OS.. . . ,e g VMware workstation Parallels D.rivers and bootstrapping code

y PCs whose underlying x86 platform wasn t designed to support full hardware virered less secure because the VMM must rely on the host OS to provide it with se


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ent Approaches To Virtualizat. -1 Emulation basedFullVirtualization

. /2 Para Virtualization CooperativeVirtualization

. -3 Hardware assisted Full Virtualization

.4 OS Level Virtualization

.5 Application Virtualization

. -6 API level Virtualization


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-Emulation based Full Virtualization

,ine in software by analysing all instructions and converting each one appropriaer completely independent and unaware of the other virtual servers running on t


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,o run unmodified but converting sensitive instructions just before the

-Emulation based Full Virtualization


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/a Virtualization Cooperative Virtualization

- .est servers in a Para virtualization system are aware of one another,systems because each OS is already aware of the demands the other operating sy


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rks much faster than Emulated or Hardware based virtualization technol

,It implies that only modified Guest OS can be used as VM which underst

/a Virtualization Cooperative Virtualization


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-Hardware assisted Full Virtualization

.operations and status instructions executed within a guest OS

. , -ors By comparison the VT d extensions add virtualization support to Intel chips

( ) .mprove resource use and virtual machine VM performance


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OS Level Virtualization

,(the kernel of an operating system allows for multiple isolated partitions oft

.in virtual partition use the operating system's normal system call interface

, .est operating system different from the host one or a different guest kernel

.l


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Other types of virtualization

cation Virtualization .ation creates a sandbox environment for its execution, . . . .AMPLE in browser etc e g JRE

evel Virtualization.lization provided to support single application

(INE WIN dows E ) .mulator is used to run Windows programs in Linux environment


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ity by isolating multiple applications in their own VMs as application

,loads onto a single physical platform reducing the total cost and spac

es it possible to decouple the guest from the hardware on which it is c

.be tested safely

, , ,dware or OS etc can be made to run on the OS they support in a virtua

Advantages Of Virtualization


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.d sensitive than more than a few physical servers

, , . ,st to another involves extra IPs etc Plus the shared storage sometim

/ .ompared to single server service requirements

- , - ,security by re exposing vulnerabilities reactivating at risk services

Disadvantages Of Virtualization


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Presentation 32 - Copy

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