KVM (Kernel Virtual Machine)

check whether virtualization extensions is enabled in BIOS.

intel based processor 

[root@server ~]# grep -e 'vmx' /proc/cpuinfo

amd based

[root@server ~]# grep -e 'svm' /proc/cpuinfo

The output should contains kvm_intel for intel-based hosts or kvm_amd for amd-based hosts.

Virt-manager : gui tools

libvirt-client : CL Tool

virt-install : create virtual machines

libvirt : server and host side libaries

required packages

install qemu-kvm libvirt-bin virtinst bridge-utils

root@dlp:~#

echo vhost_net >> /etc/modules

nano /etc/network/interface

before add bridge eth0 must be manual. Otherwise network collution if setup eth0 as static.

Auto eth0

iface eth0 inet manual

ifup bro

ip addr

install image

trouble

solution

trouble :

solution

move iso file into different partition

add root user to kvm group

adduser root kvm

add root to libvirt

update group membership






You should then be able to list your domains:

# virsh list --all

libvirt defaults to qemu:///session for non-root. So from you'll need to do:

$ virsh --connect qemu:///system list –all

convert vmdk to img

 

$ qemu-img convert -f vmdk -O raw image.vmdk image.img 20GB
$ qemu-img convert -f vmdk -O qcow2 image.vmdk image.qcow2
$ qemu-img convert -f vmdk -O qed image.vmdk image.qed
VBoxManage clonehd --format RAW vm.vdi vm.img

create virtual image

virt-install --name debian --ram 2048 --disk path=/media/data/virtual-envirnments/kvm/debian.img,device=disk,bus=virtio,sparse=true,format=raw,size=10 --vcpus 2 --os-type linux --network bridge=br0 --graphics none --console pty,target_type=serial -c '/media/kolwin/A/os/debian/debian-8.6.0-amd64-xfce-CD-1.iso'

above not working remove –graphics none then it' will work

basic operations

virsh start debian

virsh start debian –console

virsh shutdown debian

virsh destroy debian

virsh autostart debian

virsh autostart –disable debian

virsh list

virsh list –all

virsh console debian (cannot run without start debian)

Management tools

install libguestfs-tools virt-top

virt-ls -l -d debian /home

virt-cat -d debian /etc/passwd

virt-edit -d debian /etc/fstab

virt-df -d debian

virt-top

mount a disk for a virtual machine

guestmount -d debian -i /mnt

ll /mnt

spice server

virsh edit debian

spice client

install virt-viewer

Network

login to virsh shell

virsh –connect qemu:///system

commands

virsh list

shutdown debian

get host machine information

virsh help host

add physical harddisk

virsh edit debian

This will make the host’s /dev/md/storage available in the guest as /dev/vdb. After changing a domain’s config by hand, you have to reload the config by hand. Log in to your host and issue this command:

# virsh attach-disk Guest1 --persistent /dev/sdc1 vdb --type cdrom --mode readonly

--type hdd

--type floppy

if using externel. Xml file

virsh update-device  guest-device.xml
Device updated successfully

install openedx

VBoxManage clonehd --format RAW vm.vdi vm.img

$ qemu-img convert -f vmdk -O raw image.vmdk image.img 20GB

virt-install -n openedx3 -r 3072 --vcpus 2 --os-type linux --disk /media/data/virtual-envirnments/kvm/openedx3.img,device=disk,bus=virtio -w bridge=br1,model=virtio -w bridge=br0,model=virtio --vnc --noautoconsol --import

delete

# virsh undefine VM_NAME

its working

get network info

virsh domiflist openedx3

attach-interface

virsh attach-interface --domain openedx3 --type bridge --source wlan0 --target eth1 --model virtio --persistent

box-disk3.img (eth0 192.168.2.106, eth1 192.168.1.211)

1. attach-interface --domain openedx3 --type bridge --source br1 --target vnet0 --model virtio --persistent

2. attach-interface --domain openedx3 --type bridge --source br0 --target vnet1 --model virtio –persistent

first 1 and 2 otherwide network not working. Openedx eth0=br1 eth1=br0

nano /etc/libvirt/qemu/openedx3.xml

add autostart

systemctl enable libvirtd

virsh autostart vmName
virsh autostart debianlenny1

virsh autostart VMNameHere --disable