Virtualization - Northwest State Community College
Transcript of Virtualization - Northwest State Community College
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Virtualization
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Objectives
• Definitions
• Why
• Problems
• Versions
• Virtualization vs Cloud
• Creating a New Virtual Machine
• Working with a Virtual Machine
• Virtual Machine Settings
• Virtual Machine Snapshots
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Definitions
• Hardware• Full virtualization
• Para virtualization
• Hosted hypervisor• Type I hypervisor
• Native (bare metal) hypervisor• Type II hypervisor
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Why
• Servers can be consolidated into virtual machines• A typical company may have dozens of servers, DNS, Web, File, Print, DHCP,
Directory and the list goes on and on
• Companies can save space and money with virtualization• Electricity and cooling
• Flexibility
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Why
• Multiple applications and operating systems can be supported within a single physical system• Testing – Do not have to have multiple physical machines
• Students – Does not require multiple systems and/or long setup time to learn different subjects
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Why
• Virtual machines are completely isolated from the host machine and other virtual machines• This means no possibility of undesired interactions
• If one server (service) crashes this does not affect any of the others
• Student Benefit – If Joe Bob Classmate accidentally types delete all he only messes up his own system, not yours
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Why
• Complete virtual machine environment is saved as a single file• Makes backups simple
• Makes testing easier
• Make it simple to duplicate servers across multiple sites
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Why
• Standardized virtualized hardware is presented to the application
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Problems
• Slow
• Conceptualization
• Cost
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Versions
• VMWare• Free
• Player
• Server 1.x
• Server 2.x
• Server ESXi
• Pay• Workstation
• VSphere
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Versions
• Microsoft• Free
• Hyper-V
• Virtual PC
• Pay• System Center
• Azure
• Amazon – EC2
• VirtualBox
• Xen
• KVM
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Virtualization vs Cloud
• IaaS – Infrastructure as a Server• Servers, storage and processing
• PaaS – Platform as a Service• Development environment
• Access to services such as database or web server
• SaaS – Software as a Service• End user applications
• Google Apps
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Virtualization vs Cloud
• The cloud is:• Elastic
• Shared
• Usage-based
• Supports many devices• So is Virtualization
• Self-provisioning• Virtualization is all self provisioned
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Creating a New Virtual Machine
• Select name
• Select type of OS
• Select version of OS
• OS settings define some hardware settings • Cannot be changed
while powered on
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Creating a New Virtual Machine
• Select Memory• Overprovision,
shared RAM and ballooning
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Creating a New Virtual Machine
• Hard drive creation options
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Creating a New Virtual Machine
• Hard drive file type
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Creating a New Virtual Machine
• Storage type• Thick
• Thin
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Creating a New Virtual Machine
• Name and size
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Working with a Virtual Machine
• Starting
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Working with a Virtual Machine
• Mouse trapped in machine
• Ctrl+Alt+Del
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Working with a Virtual Machine
• Shutdown• Like a real machine you
should shutdown in an orderly fashion
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Working with a Virtual Machine
• Shutdown• Other options
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Virtual Machine Snapshots
• General - Basic
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Virtual Machine Settings
• System – Motherboard
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Virtual Machine Settings
• Storage• Add hard drives
• Mount ( Connect ) to CD/DVD images ( ISO files )
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Virtual Machine Settings
• Network• Multiple adapters
• Attached to: ( Virtual Networks )• NAT
• Bridged
• eth0
• tap0
• Internal
• Name
• Host-only
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Virtual Machine Settings
• Drivers
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Virtual Machine Snapshots
• Saves a copy of the machines hard drive(s) at a point in time• Can consume large amounts of disk space
• Contains all differences between the snapshot and the current system
• Differencing disk contains all changed data blocks
• Also known as checkpoints
• Can have multiple snapshots
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Virtual Machine Snapshots
• Choices• Take snapshot
• Restore snapshot• Deletes changes!
• Delete snapshot• Makes changes permanent!
• Clone (Copy)• MAC address
• Full
• Linked
• Can also create
appliance
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Summary
• Definitions
• Why
• Problems
• Versions
• Virtualization vs Cloud