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Are you an expert in Linux based operations? Are you a specialist at creating useful IT resources? www.wisdomjobs.com provide you with the right option to heighten your dream career. Virtualization is a technology that helps you in creating useful IT services using resources bound to hardware. Linux Virtualization is the application for running one or more virtual machines using Linux Open Source operating system on a physical computer. Linux Virtualization job requires knowledge of Linux systems, technical experience in cloud and virtualization technologies, scripting language, integration, and testing. www.wisdomjobs.com provides you with Linux Virtualization jobs questions and answers page designed by our experts to help you to improve your standards and excel at interview clearing ability. Register to our www.wisdomjobs.com jobs portal for further notifications.
Question 1. What Is Virtualization ?
Answer :
Virtualization is a technique for creating virtual resources (rather than the actual) such as server, storage device, network and Operating system. Virtualization is dis-associating the tight bond between software and hardware.
Question 2. What Are The Different Types Of Virtualization ?
Answer :
Virtualization can be used in different ways and can take many different forms.
Some of them are listed below :
Question 3. What Is The Difference Between Full Virtualization & Para Virtualization ?
Answer :
Full virtualization & para virtualization both comes under the Hardware virtualization.
Some of the difference between them are listed below :
Full Virtualization : It is a virtualization in which guest machine(virtual machines) is unaware that it is in virtualized environment therefore hardware is virtualized by the host operating system so that the guest can issue commands to what it thinks is actual hardware but really are just simulated hardware devices created by the host
Para Virtualization : It is a virtualization in which guest machine is aware that it is in virtualized environment . If guest machine require resources like memory & cpu , it issues command to guest operating system instead of directly communication with actual hardware.
Question 4. What Is Hypervisor ?
Answer :
Hypervisor is a piece of a software that is being install on the physical machine , which then further creates and run virtual machines. Virtual machine are known as guest machines and host machine is the hypervisor on which different virtual machines are created.
Question 5. What Are Different Hypervisors Available In Linux ?
Answer :
Xen & KVM are two hypervisor available in linux.
Question 6. What Is The Difference Between Xen & Kvm ?
Answer :
For Xen hypervisor first we have to install Xen kernel and have to boot the machine with Xen kernel where as KVM is kernel based Virtualization , we don’t need any extra kernel for KVM. KVM is a module in Kernel. Xen hypervisor by default does not support full virtualization whereas KVM supports Full virtualization.
Question 7. What Is Type-1 And Type-2 Hypervisor ?
Answer :
Type-1 hypervisor is bare metal hypervisor runs on bare metal of hardware. Hyper-V and ESXI Server are the examples of type-1 hypervisor. Type-2 hypervisor is hosted by operating system. Examples of type-2 hypervisor are Microsoft Virtual Server & VMware Server.
Question 8. What Is Dom0 In Xen ?
Answer :
Dom0 or Domain0 is the initial domain started by xen hypervisor. It has the special rights like to start new domain and access the hardware directly. Dom0 is responsible for running all of the device drivers for the hardware.
Question 9. How To Verify Virtualization Technology (vt) Is Enabled In Your Server’s Bios Or Not ?
Answer :
grep -E ‘svm|vmx’ /proc/cpuinfo
vmx is for Intel processors
svm is for AMD processors
Question 10. What Is The Use Of Virsh Command ?
Answer :
virsh is the interface or command for managing the virtual machines based on KVM & Xen hypervisor. On virsh interface virtual machines are identified by their domain names , so virsh is generally used to list current domains , to create , pause & shutdown domains.
Question 11. How To Identify The Kvm Version ?
Answer :
To find the KVM version use the command ‘virsh version’
Question 12. Which Command Is Used To List All Virtual Machine Running On The Kvm Hypervisor ?
Answer :
Using the command ‘virsh list –all’ we can list all virtual machines irrespective of their states.
Question 13. How To Forcefully Shutdown The Kvm Based Virtual Machine From The Command Line ?
Answer :
We can forcefully shutdown the VM using the command ‘virsh destroy machine_name’.This command should only be used in a case where VM is in Hung state because forcefully shut down may cause filesystem corruption.
Question 14. What Are The Basic Requirements Of Vm Live Migration In Kvm ?
Answer :
Some of the basic requirements are listed below :
Question 15. Which Command Is Used In Kvm For Vms Live Migration ?
Answer :
‘virsh migrate –live machine_name qemu+ssh://destination_server/system’
Question 16. What Are The Different States Of A Vm In Xen Hypervisor ?
Answer :
A VM can have different states like
r – Running
b – Blocked
c – crashed
s – Shutdown
p – Paused
Question 17. How To Get The Console Of Guest Or Virtual Machine In Xen ?
Answer :
xm console <domain-id>
Question 18. How To Shutdown,reboot & Start Vms ( Domain-ids) In Xen ?
Answer :
Use xm command :
# xm shutdown [domain-id]
# xm reboot [domain-id]
# xm start [domain-id]
Question 19. How To Get Hardware Information Of Kvm Guest Machine ?
Answer :
Use the command ‘virsh dominfo <domain-name / VM Name>’
Question 20. How To Connect A Particular Vm Using Virt-viewer ?
Answer :
virt-viewer -c qemu:///system <VMName>
Linux Virtualization Related Tutorials |
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Linux Embedded systems Tutorial |
Linux Virtualization Related Practice Tests |
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Linux Embedded systems Practice Tests | Red Hat Linux Essentials Practice Tests |
Red Hat Linux System Administration Practice Tests |
Linux Virtualization Practice Test
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