boot a cloud image in kvm

images.sh

## Install a necessary packages
sudo apt-get install kvm cloud-utils genisoimage
modprobe kvm && modprobe kvm-intel

## URL to most recent cloud image of 16.04
img_url="http://cloud-images.ubuntu.com/server/releases/16.04/release"
img_url="${img_url}/ubuntu-16.04-server-cloudimg-amd64-disk1.img"
## download the image
wget $img_url -O disk.img.dist

## Create a file with some user-data in it
cat > my-user-data <<EOF
#cloud-config
password: passw0rd
chpasswd: { expire: False }
ssh_pwauth: True
EOF

## Convert the compressed qcow file downloaded to a uncompressed qcow2
qemu-img convert -O qcow2 disk.img.dist disk.img.orig

## create the disk with NoCloud data on it.
cloud-localds my-seed.img my-user-data

## Create a delta disk to keep our .orig file pristine
qemu-img create -f qcow2 -b disk.img.orig disk.img

## Boot a kvm
kvm -net nic -net user -hda disk.img -hdb my-seed.img -m 1024

# Cirros
# Download from http://download.cirros-cloud.net/
username: cirros
password: cubswin:)


# Test qemu guest agent
virsh qemu-agent-command $INSTANCE '{"execute":"guest-info"}'
virsh qemu-agent-command $INSTANCE '{"execute":"guest-ping"}'
virsh qemu-agent-command $INSTANCE '{"execute":"guest-network-get-interfaces"}'

Hi,

i tried qemu-img create -f qcow2 -b disk.img.orig disk.img, but i did not create a disk.img. Output was:

qemu-img: disk.img: Backing file specified without backing format 
Detected format of qcow2.

instead qemu-img create -f qcow2 -F qcow2 -b disk.img.orig disk.img did it.

br Olli