1. What is virtualization?
Virtualization allows multiple operating system
instances to run concurrently on a single computer;it is a means of separating hardware from a single
operating system. Each “guest” OS is managed bya Virtual Machine Monitor (VMM), also known as a
hypervisor. Because the virtualization system sitsbetween the guest and the hardware, it can control the guests’ use of
CPU, memory, and storage,even allowing a guest OS to migrate from one machine to another.
2. What are
types of virtualizations available in Linux?
RHEL - 5 : RHEL
- 6 & 7 :
xen kvm
64
bit 64
bit
VT-Enabled VT-Enabled
Intel/AMD Intel/AMD
2
GB RAM 2
GB RAM
6
GB Hard disk 6
GB Hard disk
3. What are the packages of
virtualization and how to install the packages?
(i) qemu (It
is used to provide user level KVM virtualization and
disk image also)
(ii) virt (It
is used to provide virtualization software)
(iii) libvirt (It
is used to provide the libraries for virtualization software)
(iv) python (This
package provides the host and server libraries for interacting with
Hypervisor and Host system)
# yum
install qemu* virt*
libvirt* python* -y (to install the virtualization
softwares)
4. How to start the virtualization
manager and how to create a new virtual machine?
(i) Go to Applications ----->
System Tools -----> Virtual
Machine Manager
(ii) Vitual Machine
Manager is used to check and displays the available virtual machines. It is also used to create the new virtual machines.
(iii) To create a
new virtual machine first click
on monitor icon,
then enter the virtual machine name,
Select Local and Select
Forward.
(iv) Click
on Browse Local, Select
the guest O/S " . iso " image file
and Select Forward.
5. What are the packages of Virtualization Hypervisor
and how to install the packages?
(i) "virtualization hypervisor" (provides
the foundation to host virtual machines includes the libvirt
and qemu- kvm package)
(ii) "virtualization client" (provides
the support to install and manage virtual machines includes virsh, virt-install,
virt-manager, virt-top and
virt-viewer packages)
(iii)
"virtualization tools" (provides tools for offline
management of virtual machines includes the libguestfs package)
(iv)
"virtualization platform" (provides
an interface to access and control virtual machines includes the libvirt, libvirt-client and
virt-who packages)
Installation of
Virtualization Hypervisor :
# yum
group install "virtualization hypervisor" "virtualization client" "virtualization tools"
"virtualization platform" -y
6. How to create a storage pool and
volume using virsh tool?
(i) View all the available storage
pools by #
virsh pool-list command.
(ii) Create a storage pool directory by # mkdir
/var/lib/libvirt/
(iii) Define the storage pool directory by # virsh
pool-define-as
dir ----/var/lib/libvirt/ command.
(iv) Start the
virtual storage pool by #
virsh pool-start
(v) To see the specified storage pool
information by #
virsh pool-info
(vi) Create the storage pool volume with
specified size by #
virsh vol-create-as
(vii) To see the
list of all available storage pool volumes
by # virsh vol-list
Other
useful commands :
# lscpu (to
list the CPU information)
# cat /proc/cpuinfo (to
display the CPU information)
# virsh start
(to start
the virtual machine)
# virsh shutdown (to shutdown
the virtual machine)
# virsh destroy
(to delete
the virtual machine)
# virsh suspend
(to pause
the virtual machine)
# virsh resume
(to start
the paused virtual
machine)
# virsh net-list (to
see all the available virtual machines)
# virsh net-define
/root/ (to
define a virtual network using xml file)
# virsh net-autostart (to
set the virtual network autostart at reboot)
# virsh net-start (to start the virtual network)
# rht-vmctl fullreset
all (to reset
all the virtual
machines as new
machines)
# rht-vmctl reset
server (to reset
the server virtual
machine)
# rht-vmctl reset
client (to reset
the client virtual machine)
# pushcourse all
(to send
the server and
client virtual machines
to the specified system)
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