Virtualization And Their Types | Virtualization Technology In Cloud Computing

Virtualization :

is a creating of virtual rather than actual real version (Server ,Network ,Storage).To Simulate hardware functionality.

Benfit:

Reduce the IT cast and agility for all size business.

What is Hypervisor: 

Software code/firmware create the virtual machines. Virtual machine is called guest virtual machine.

What is bare-metal:

hypervisor run directly on the host’s hardware to control h/w and to manage the guest OS.

What is Host OS:

OS run directly on the hardware.

What is Guest OS: 

run on Virtual Machine.

what is emulator : 

Enable one computer system(called host) to behave like another computer system(Called the guest). Ex : emulator for android(stimulate android in Linux)

Qemu – Quick Emulator , hardware virulization.(host virtual machine monitor)
1)For Live Migration we need
a) Extra IP
b) Shared Storage
c) Global File system.
NOTE: XEN is the best virtualization.
2) Virtualization Disadvantage
1) Don’t have console block access to trouble shoot.
3) Important Abbreviation & Commands
Virt-manager –GUI managing Virtualization
Virt-viewer –view the console
libirt-actual hypervisor
qemu-kvm ---CLI
/var/libvirt/images - virtualization image. Location
QEMU-Quick Emulator
PAE- Physical Address Extension ( Vmx intel (or) svm AMD)

Required rpm packages are - kernel-xen|xen|libvirt|virt-manager.

Services Are – libvirtd, xend, #virsh list -all

TYPE 1	TYPE 2	TYPE 3
without OS , install direct in to the hardware ( Linux KVM-directly run on the HW,IBM z/VM,VMware ESX)	with OS, additional Install Virtualization Software.(VMware workstation,VMware server)	Hybrid hyper visor
Domain-0: Privileged domain.( Base OS). Domain-U/Guest Domains/User Domain: VM created by Dom-0.

 

Type 1	Type 2
Native (bare-metal hypervisor) Top Bare-metal hypervisor Citrix xen hypervisor vmware Esxi Microsoft Hyper-V Nuatnix AHV	hosted hypervisor(Host Level Virtualization) vmware workstation/player Oracle Virtual box QEMU(qemu-kvm(quem+kvm)) KVM(user space \dev\kvm)(doubt type1/type2) Vagrant
Ring 0 – Xen Kernel code Ring 1 – Hosting domain Ring 2 - Application
Since H/W directly exposed to the guest OS, Direct execution is more efficient than TYPE 2	Not like bare-metal hypervisor
It hosts a HTTP server request VM creating,configuration and termination.	Provision interface to the VM?
This component constitutes of embryonic version of distributed virtual machine manager. Which is essential component of cloud computing systems, it will helpful to build IaaS .	Not applicable
Apply : Server Deployment	Apply : Normal Desktop Usage/Development purpose.
Source : https://www.how2shout.com/wp-content/uploads/2019/02/Types-of-Hypervisor-type-1-and-type-2.png

Desktop Virtualization : paas

Application virtualization: saas

Container : Isolate the user space – OS

Docker : container Manager

This Full (bare-metal) virtulization improve availability overall hardware resource utilization.

With virtualization several operating system run in a parallel on single CPU. 

This  Virtualization parallelism

1. reduce overhead cost
2. Using this, organisations better manage update + rapid changes OS/App without disrupting users.
3. Ultimately virtualization improves efficiency + availability of resources/applications rather 

Cloud Computing | Virtualization Technology in Cloud Computing

1. All the cloud has been built on the virtualization.
2. Cloud service providers implement essential security control – limited physical/logical access to the hypervisor and other virtualization layers.

https://en.wikipedia.org/wiki/Virtualization#Other_types

Common Cloud Services

1. Compute
2. Database
3. Storage
4. security
5. networking
6. monitoring
7. Developting
8. IOT
9. HPC
10. BIG Data

AWS Cloud computing services

1. IAM (User,Groups,Roles,Polices)
2. Storace - S3 - Simple Storage service -(Polices(password/rules),class)
3. cloudFront CDN(Content Delivery Network)
4. Storage Gateway-(File Gateway,Volume Gateway(ISCSI),Tape Gateway(VTL)
5. Compute- Ec2 option - On Demand, Reserved, Spot,Dedicate Host
6. EBS - Elastic Block Storage - EC2 + attached to EBS

Storage Virtualization

Source :https://www.evaluatorgroup.com/wp-content/uploads/2014/05/Screen-Shot-2014-08-20-at-11.36.05-AM.png

Next article : we need to study about what is difference between VMware Esxi , VMware vsphere,