Basic script to create qcow2 backed kvm domains based on a golden domain. To install the the dependencies on fedora 19 run the following: yum install libvirt-client qemu-img libguestfs-tools xmlstarlet libxml2 The virt-sysprep tool can do much more than this and I could potentially set the hostname and configure the machine to run some scripts w…

virt-sliver

#!/bin/bash                                                                     
                                                                                
# Requirements on Fedora are:                                                   
#    libguestfs-tools for virt-sysprep                                       
#    xmlstarlet                                                              
#    libvirt-client                                                          
#    qemu-img                                                                
#    libxml2 for xmllint 
#
# Usage:
#    Shutdown the domain_golden virtual machine and run the following command as root.
#    
#        /path/to/virt-slice domain_golden domain_new
#                                                        
                                                                                
                                                                                
OLDDOMAIN=$1                                                                    
NEWDOMAIN=$2                                                                    
                                                                                
OLD_DOMAIN_XML=$(virsh dumpxml $OLDDOMAIN)                                      
                                                                                
DISK_DIR=$(dirname $(echo $OLD_DOMAIN_XML|xmlstarlet sel -t -m '/domain/devices/disk/source' -v @file))
qemu-img create -f qcow2 -b ${DISK_DIR}/${OLDDOMAIN}.img ${DISK_DIR}/${NEWDOMAIN}.img
chown --reference ${DISK_DIR}/${OLDDOMAIN}.img ${DISK_DIR}/${NEWDOMAIN}.img
virt-sysprep -a ${DISK_DIR}/${NEWDOMAIN}.img                                    
                                                                                
NEW_DOMAIN_XML=$(echo $OLD_DOMAIN_XML| xmlstarlet ed -O -u '/domain/uuid' -v $(uuidgen) 2>/dev/null )
NEW_DOMAIN_XML=$(echo $NEW_DOMAIN_XML| xmlstarlet ed -O -u '/domain/devices/interface/mac/@address' -v $(echo 52:54:00$(hexdump -n3 -e '/1 ":%02X"' /dev/random)) 2>/dev/null)
NEW_DOMAIN_XML=$(echo $NEW_DOMAIN_XML| sed "s/${OLDDOMAIN}/${NEWDOMAIN}/g")     
                                                                                
#echo $NEW_DOMAIN_XML |xmllint --format -                                       
#exit                                                                           
                                                                                
TMP_FILE=$(mktemp)                                                              
echo $NEW_DOMAIN_XML |xmllint --format - > $TMP_FILE                            
                                                                
virsh define $TMP_FILE