quick-ubuntu-cloud-vm.sh

#!/bin/bash -x

# Dependencies
sudo apt-get install -y kvm cloud-utils genisoimage

# Download cloud image
img_url="http://cloud-images.ubuntu.com/server/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img"
wget $img_url -O disk.img.dist

# Create user-data
cat > user-data <<EOF
#cloud-config
password: password
chpasswd: { expire: False }
ssh_pwauth: True
runcmd:
 - [ sh, -xc, "echo 'password: password\nchpasswd: { expire: False }\nssh_pwauth: True' | tee /var/lib/cloud/seed/user-data" ]
 - [ sh, -xc, "echo '{\"instance-id\": \"iid-local01\"}' | tee /var/lib/cloud/seed/meta-data" ]
 - [ sh, -xc, "echo 'datasource_list: [ NoCloud ]' | sudo tee /etc/cloud/cloud.cfg.d/90_dpkg.cfg" ]
 - dpkg-reconfigure -f noninteractive cloud-init
 - poweroff
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 -d raw seed.img 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 -drive file=seed.img,index=1,media=disk,format=raw -m 512