KVM_Guide.md

Install KVM

apt-get install qemu-kvm libvirt-bin virtinst bridge-utils

Install OS

virt-install --name trusty1404 --hvm --ram 1024 --vcpus 1 --disk path=/virt/disks/trusty1404.img,format=qcow2,size=10 \  
--network network:default --accelerate --graphics vnc,listen=0.0.0.0,port=5911 \  
--cdrom /virt/images/ubuntu-14.04.2-server-amd64.iso -d  

use bridge network

virt-install --name trusty1404 --hvm --ram 1024 --vcpus 1 --disk path=/virt/disks/trusty1404.img,format=qcow2,size=10 \  
--network bridge:br0 --accelerate --graphics vnc,listen=0.0.0.0,port=5911 \  
--cdrom /virt/images/ubuntu-14.04.2-server-amd64.iso -d  

Destroy Virtual Machine

virsh shutdown trusty1404 # Optional  
virsh destroy trusty1404  
virsh undefine trusty1404  

Clone Virtual Machine

virt-clone --original=trusty1404 --name=clone0 --file=/virt/disks/clone0.img

Operate Pool

create pool

virsh pool-create-as --name master_pool --type dir --target /virt/disks  

view pool info

virsh pool-info master_pool  

start pool

virsh pool-start master_pool  

list pool

virsh pool-list  

Operate Snapshot

create snapshot

virsh snapshot-create-as trusty1404 snapshot1  

revert snapshot

virsh snapshot-revert trusty1404 snapshot1  

Configure Bridged Network

/etc/network/interface

auto eth0
iface eth0 inet manual

auto br0
iface br0 inet static
address ...
netmask ...
gateway ...
bridge_ports eth0
bridge_stp off
bridge_fd 0
bridge_maxwait 0

dns-nameservers ...

then

reboot  
brctl show  

Random Mac Address

echo $RANDOM | md5sum | sed 's/\(..\)/&:/g' | cut -c1-17

Update Virtual Machine Config

virsh edit trusty1404  

Dump Virtual Machine Config

virsh dumpxml trusty1404 > /etc/libvirt/qemu/trusty1404-2.xml

Resize disk space

virsh vol-resize your_volume_name.img 100G --pool master_pool  

Mount CD-ROM

virsh attach-disk trusty1404 /your/path/xxx.iso hdc --type cdrom --mode readonly  

then

virsh attach-disk trusty1404 "" hdc --type cdrom --mode readonly