Cloud-init example using a Generic Cloud CentOS-7 on a libvirtd qmu/kvm lab

cloud-init.sh

#!/bin/sh

if [ "$EUID" -ne 0 ]; then 
	echo -e "\nPlease run as root\neg. sudo $0 \n"
	exit
fi

GITHUB_USERNAME="ebal"

cd `mktemp -d`

## Create meta-data
cat > meta-data <<EOF
instance-id: testingcentos7
local-hostname: testingcentos7

network-interfaces: |
  iface eth0 inet static
  address 192.168.122.228
  network 192.168.122.0
  netmask 255.255.255.0
  broadcast 192.168.122.255
  gateway 192.168.122.1

# vim:syntax=yaml
EOF

## Create user-data
cat > user-data <<EOF
#cloud-config

# Set default user and their public ssh key
# eg. https://github.com/ebal.keys
users:
  - name: ${GITHUB_USERNAME}
    ssh-authorized-keys:
      - `curl -s -L https://github.com/${GITHUB_USERNAME}.keys`
    sudo: ALL=(ALL) NOPASSWD:ALL

# Enable cloud-init modules
cloud_config_modules:
  - resolv_conf
  - runcmd
  - timezone
  - package-update-upgrade-install

# Set TimeZone
timezone: Europe/Athens

# Set DNS
manage_resolv_conf: true

resolv_conf:
  nameservers: ['9.9.9.9']

# Install packages
packages:
  - mlocate
  - vim
  - epel-release

# Update/Upgrade & Reboot if necessary
package_update: true
package_upgrade: true
package_reboot_if_required: true

# Remove cloud-init
runcmd:
  - yum -y remove cloud-init
  - updatedb

# Configure where output will go
output:
  all: ">> /var/log/cloud-init.log"

# vim:syntax=yaml
EOF

## Create ISO with meta-data & user-data
genisoimage -output cloud-init.iso -volid cidata -joliet -rock user-data meta-data

## Destroy & Undefine previous Libvirt image

virsh destroy --domain centos7_test

virsh undefine --domain centos7_test

## Download Generic Image (if necessary)
curl -LO -C - http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2.xz

## Uncompress
xz -v --keep -d CentOS-7-x86_64-GenericCloud.qcow2.xz 

## Give perms
chown -R nobody:kvm .

## Provision
virt-install  \
	--connect qemu:///system \
	--name centos7_test   \
	--memory 2048   \
	--vcpus 1   \
	--metadata description="My centos7 cloud-init test"   \
	--import   \
	--disk CentOS-7-x86_64-GenericCloud.qcow2,format=qcow2,bus=virtio   \
	--disk cloud-init.iso,device=cdrom   \
	--network bridge=virbr0,model=virtio   \
	--os-type=linux   \
	--os-variant=centos7.0   \
	--noautoconsole

## Print msg
echo -e " \n ssh ${GITHUB_USERNAME}@192.168.122.228 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no \n "

rm -rf `pwd -P`

notes based on archlinux