Domain Cloning

   1 #!/bin/sh
   2 
   3 SRC_VOLUME_GROUP="vg_storage"
   4 DST_VOLUME_GROUP="vg_storage"
   5 SRC_NAME="bullseye-template"
   6 SRC_VOLUME="kvm_${SRC_NAME}_vda"
   7 SRC_VOLUME_SIZE=`lvs /dev/${SRC_VOLUME_GROUP}/${SRC_VOLUME} -o LV_SIZE --noheadings --units B --nosuffix`
   8 DST_NAME="bullseye-clone"
   9 DST_VOLUME="kvm_${DST_NAME}_vda"
  10 DST_MEMORY="256M"
  11 MOUNTPOINT="/mnt/domain_root"
  12 MAC=""
  13 
  14 if [ ! -e /sbin/kpartx ]
  15 then
  16         apt-get install -y kpartx
  17 fi
  18 
  19 if [ $# -gt 0 ]
  20 then
  21         DST_NAME=${1}
  22         DST_VOLUME="kvm_${DST_NAME}_vda"
  23 fi
  24 
  25 if [ "${2}" != "" ]
  26 then
  27         MAC="--mac ${2} "
  28 else
  29         MAC=$(grep ${DST_NAME} /root/scripts/mac | awk -F "\t" {'print $1'})
  30         MAC="--mac ${MAC}"
  31 fi
  32 
  33 if [ ! -e /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} ]
  34 then
  35         # create lvm partition
  36         lvcreate --yes --size ${SRC_VOLUME_SIZE}B --name ${DST_VOLUME} ${DST_VOLUME_GROUP}
  37 
  38         # clone the domain
  39         virt-clone \
  40                 --original ${SRC_NAME} \
  41                 --name ${DST_NAME} \
  42                 --file /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} \
  43                 ${MAC} \
  44                 --check path_in_use=off,path_exists=off
  45 
  46         # mount the domains / partition
  47         OFFSET=`kpartx /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} | tail -n1|awk {'print $6'}`
  48         OFFSET_BYTES="$((${OFFSET} * 512))"
  49         losetup -o ${OFFSET_BYTES} /dev/loop0 /dev/${DST_VOLUME_GROUP}/${DST_VOLUME}
  50         pvscan
  51         vgscan
  52         vgchange -ay vg_os
  53         if [ ! -e ${MOUNTPOINT} ]
  54         then
  55                 mkdir -p ${MOUNTPOINT}
  56         fi
  57         mount -o subvol=@rootfs /dev/vg_os/root ${MOUNTPOINT}
  58         # manipulate domain
  59         mkdir ${MOUNTPOINT}/root/scripts
  60         cp /root/scripts/guest_cleanup.sh ${MOUNTPOINT}/root/scripts
  61         # hostname
  62         cp ${MOUNTPOINT}/etc/hosts ${MOUNTPOINT}/etc/hosts.kk
  63         sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hosts
  64         cp ${MOUNTPOINT}/etc/hostname ${MOUNTPOINT}/etc/hostname.kk
  65         sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hostname
  66 
  67         # rc.local
  68         echo "#!/bin/sh" > ${MOUNTPOINT}/etc/rc.local
  69         # this delay is needed for the network to settle, works with 32, but using 64 to be sure
  70         #echo "sleep 64" >> ${MOUNTPOINT}/etc/rc.local
  71         echo "/root/scripts/guest_cleanup.sh ${DST_NAME}" >> ${MOUNTPOINT}/etc/rc.local
  72         echo "rm /etc/rc.local" >> ${MOUNTPOINT}/etc/rc.local
  73         echo "shutdown -h 0" >> ${MOUNTPOINT}/etc/rc.local
  74         echo "exit 0" >> ${MOUNTPOINT}/etc/rc.local
  75         chmod +x ${MOUNTPOINT}/etc/rc.local
  76         # ssh keys
  77         mkdir ${MOUNTPOINT}/root/.ssh
  78         cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/root/.ssh/authorized_keys
  79         mkdir ${MOUNTPOINT}/home/kale/.ssh
  80         cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/home/kale/.ssh/authorized_keys
  81         chown -R kale:kale ${MOUNTPOINT}/home/kale/
  82         # unmount and cleanup
  83         umount ${MOUNTPOINT}
  84         vgchange -an vg_os
  85         losetup -d /dev/loop0
  86         # cleanup domain
  87         virt-xml ${DST_NAME} --edit --graphics password=${DST_NAME}
  88         #virt-xml ${DST_NAME} --remove-device --graphics all
  89         virsh setmaxmem ${DST_NAME} --size ${DST_MEMORY} --config
  90         virsh setmem ${DST_NAME} --size ${DST_MEMORY} --config
  91         virsh start ${DST_NAME}
  92 else
  93         echo "${0}: refusing to overwrite existing domain"
  94 fi