virtualization

virtualization:::
checking proceess support::
egrep "(vmx/svm)" /proc/cpuinfo

what is virtualization:::
Bare metal installation:native installation 

hypervisor::
os running on virtual machine guest
os running into hypervisor is callled host

virtualization type::
full virtualization
para virtualization

fulll virtalizaton::
hardware virtual machine
hypervisor create emulated devices(virual motherboard,ram etc)


quick emulateor(QEMU)+kernal based virutal machine(KVM)

PARA virtualizaton:::
guest os must be modified to be aware it's virtualization
guest can comm. directly with h/w
Xen hypervisor...

Hypervisors::
Xen,Proxmox,ESX
	RUN ON bare machine
KVM
	part of linux kernal

libvirt and virtual machine manager tools (tools)

create a virtual machine:::
QEMU from command line genrally for creating virtualizatoin.
install qemu qemu-kvm
ls /usr/bin/qemu*  (process architecures)
man qemu-system(manual pages)
genrate disk image file

Distk image formt
Raw::::
	a file that represent a disk
	ALL SPACE TAKEN at creation :thick provisioned
QEMU copy on wirte (QCOW2)

copy on write::

qemu-img create -f(format) qcow2 my-image.qcow2 60G


qemu-system-x86 -cdrom pathofiso image  destinantion locaiton -m 2G -enable-kvm

installation ubuntu(04)

qemu-system-x86_64 my_image.qcow2 -m 2G -enable-kvm

lshw(hardware info)

free -h
df -h

modify a QEMU VM
	set memory,chamge h/w ,add disk



Libvirt(tools) ::provide standard interface to mng VM

sudo apt-get install virt-manager
virt-install

control virtual machine with virsh::::
virsh(tools)

SPICE(protocol)
VNC

snapshot and cloneing of virtual machine:
cloning to machine
snapashot  of machine

explorer containers with LXC::
Linux container(LXC)
install lxc1

lxc provide container for different distro

ip -a