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Install CentOS cloud images on KVM using cloud-init
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#!/bin/bash | |
## **Updates to this file are now at https://github.com/giovtorres/kvm-install-vm.** | |
## **This updated version has more options and less hardcoded variables.** | |
# Take one argument from the commandline: VM name | |
if ! [ $# -eq 1 ]; then | |
echo "Usage: $0 <node-name>" | |
exit 1 | |
fi | |
# Check if domain already exists | |
virsh dominfo $1 > /dev/null 2>&1 | |
if [ "$?" -eq 0 ]; then | |
echo -n "[WARNING] $1 already exists. " | |
read -p "Do you want to overwrite $1 (y/[N])? " -r | |
if [[ $REPLY =~ ^[Yy]$ ]]; then | |
echo "" | |
virsh destroy $1 > /dev/null | |
virsh undefine $1 > /dev/null | |
else | |
echo -e "\nNot overwriting $1. Exiting..." | |
exit 1 | |
fi | |
fi | |
# Directory to store images | |
DIR=~/virt/images | |
# Location of cloud image | |
IMAGE=$DIR/CentOS-7-x86_64-GenericCloud.qcow2 | |
# Amount of RAM in MB | |
MEM=768 | |
# Number of virtual CPUs | |
CPUS=1 | |
# Cloud init files | |
USER_DATA=user-data | |
META_DATA=meta-data | |
CI_ISO=$1-cidata.iso | |
DISK=$1.qcow2 | |
# Bridge for VMs (default on Fedora is virbr0) | |
BRIDGE=virbr0 | |
# Start clean | |
rm -rf $DIR/$1 | |
mkdir -p $DIR/$1 | |
pushd $DIR/$1 > /dev/null | |
# Create log file | |
touch $1.log | |
echo "$(date -R) Destroying the $1 domain (if it exists)..." | |
# Remove domain with the same name | |
virsh destroy $1 >> $1.log 2>&1 | |
virsh undefine $1 >> $1.log 2>&1 | |
# cloud-init config: set hostname, remove cloud-init package, | |
# and add ssh-key | |
cat > $USER_DATA << _EOF_ | |
#cloud-config | |
# Hostname management | |
preserve_hostname: False | |
hostname: $1 | |
fqdn: $1.example.local | |
# Remove cloud-init when finished with it | |
runcmd: | |
- [ yum, -y, remove, cloud-init ] | |
# Configure where output will go | |
output: | |
all: ">> /var/log/cloud-init.log" | |
# configure interaction with ssh server | |
ssh_svcname: ssh | |
ssh_deletekeys: True | |
ssh_genkeytypes: ['rsa', 'ecdsa'] | |
# Install my public ssh key to the first user-defined user configured | |
# in cloud.cfg in the template (which is centos for CentOS cloud images) | |
ssh_authorized_keys: | |
- ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDBil2QzORhDcnKiVVNpO5daOSYVp8nshcIc7aTEkdlqCRir2Oni8BEStK7x7bvh0jrp9KptlHPeos87fQs//VXEb1FEprL2c6fPWmVdtjmYw3yzSkaFKMksL7FdUoEiwF6t8pQAg2mU0Qj9emSHBKg5ttdGqNoSvXc92k7iOzgauda7jdNak+Dx9dPhR3FJwHMcZSlQHO4cweZcK63bZitxlFkJ/FJdry/TBirDhRcXslOJ3ECU2xiyRXJVPs3VNLjMdOTTAoMmZj+GraUBbQ9VIqe683xe02sM83th5hj2C4gW3qXUoFkNLfKAMRxXLRMEwI3ABFB/AAUhACxyTJp giovanni@throwaway | |
_EOF_ | |
echo "instance-id: $1; local-hostname: $1" > $META_DATA | |
echo "$(date -R) Copying template image..." | |
cp $IMAGE $DISK | |
# Create CD-ROM ISO with cloud-init config | |
echo "$(date -R) Generating ISO for cloud-init..." | |
genisoimage -output $CI_ISO -volid cidata -joliet -r $USER_DATA $META_DATA &>> $1.log | |
echo "$(date -R) Installing the domain and adjusting the configuration..." | |
echo "[INFO] Installing with the following parameters:" | |
echo "virt-install --import --name $1 --ram $MEM --vcpus $CPUS --disk | |
$DISK,format=qcow2,bus=virtio --disk $CI_ISO,device=cdrom --network | |
bridge=virbr0,model=virtio --os-type=linux --os-variant=rhel7 --noautoconsole" | |
virt-install --import --name $1 --ram $MEM --vcpus $CPUS --disk \ | |
$DISK,format=qcow2,bus=virtio --disk $CI_ISO,device=cdrom --network \ | |
bridge=virbr0,model=virtio --os-type=linux --os-variant=rhel7 --noautoconsole | |
MAC=$(virsh dumpxml $1 | awk -F\' '/mac address/ {print $2}') | |
while true | |
do | |
IP=$(grep -B1 $MAC /var/lib/libvirt/dnsmasq/$BRIDGE.status | head \ | |
-n 1 | awk '{print $2}' | sed -e s/\"//g -e s/,//) | |
if [ "$IP" = "" ] | |
then | |
sleep 1 | |
else | |
break | |
fi | |
done | |
# Eject cdrom | |
echo "$(date -R) Cleaning up cloud-init..." | |
virsh change-media $1 hda --eject --config >> $1.log | |
# Remove the unnecessary cloud init files | |
rm $USER_DATA $CI_ISO | |
echo "$(date -R) DONE. SSH to $1 using $IP with username 'centos'." | |
popd > /dev/null |
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Thanks for posting this!
I'm going to try to use it as a guideline for an Ansible version