migrate-vm-disk

#!/bin/bash
#
# Script for migrating a Virtual Machine VHD
# between Intel and AMD.
#
# Arguments: <vm-label> <cpu-count> <memory-size> <disk-image-path>
#
# Anders Evenrud <andersevenrud@gmail.com>
#

VM_LABEL="${1}"
VM_CPUS="${2}"
VM_MEM="${3}"
VM_DISK_IMAGE="${4}"
VM_TYPE="${5}"

VHD_UTIL="/usr/bin/vhd-util"
VM_MAX_VCPUS=$VM_CPUS
VM_STARTUP_VCPUS=$VM_CPUS
VM_MIN_STATIC_MEM=$VM_MEM
VM_MAX_STATIC_MEM=$VM_MIN_STATIC_MEM
VM_MIN_DYNAMIC_MEM=$VM_MEM
VM_MAX_DYNAMIC_MEM=$VM_MIN_DYNAMIC_MEM
VM_DISK_IMAGE_FORMAT="${VM_DISK_IMAGE#*.}"
VM_DISK_SIZE=0
VM_TEMPLATE="Other install media"

if [ -z "$VM_LABEL" ]; then
  echo "Cannot create a new VM without a name/label"
  exit 1
fi
if [ -z "$VM_DISK_IMAGE" ]; then
  echo "Cannot create a new VM without disk image: Not specified"
  exit 1
fi
if [ ! -f "$VM_DISK_IMAGE" ]; then
  echo "Cannot create a new VM without disk image: Does not exist"
  exit 1
fi
if [ ! -x "$VHD_UTIL" ]; then
  echo "Did not find: ${VHD_UTIL}"
  exit 1
fi

#
# 1: Pull some data for global variables
#
if [ -z "$VM_TYPE" ]; then
  VM_TYPE="PV"
fi

# Get template UUID from label
VM_TEMPLATE=$(xe template-list | grep -C 1 "${VM_TEMPLATE}" | grep uuid | awk '{print $5}')
if [ -z "$VM_TEMPLATE" ]; then
  echo "Cannot create a new VM without a valid Template"
  exit 1
fi

# Figure out what SR to use
if [[ "$VM_DISK_IMAGE" == /var/run/sr-mount* ]]; then
  SR_UUID=`basename $(dirname ${VM_DISK_IMAGE})`
else
  # Fall back to the default SR marked "Local"
  SR_UUID=$(xe sr-list | grep -C 1 "Local" | grep uuid | awk '{print $5}' | tail -n1)
  if [ -z "$SR_UUID" ]; then
    echo "Failed to discover Storage Record UUID"
    exit 1
  fi
fi

# Figure out real size of the disk using the image file
#VM_DISK_SIZE=$($VHD_UTIL read -p -n $VM_DISK_IMAGE | grep " : = " | awk '{print $5}' | sed  's/(//')
VM_DISK_SIZE=$($VHD_UTIL read -p -n $VM_DISK_IMAGE | grep "Current disk size " | awk '{print $7}' | sed  's/(//')
if [ -z "$VM_DISK_SIZE" ]; then
  echo "Failed to detect size of VHD"
  exit 1
fi
if [ $VM_DISK_SIZE -eq 0 ]; then
  echo "Error: Detected VHD size was 0"
  exit 1
fi


#NETWORK_UUID=$(xe network-list bridge=xenbr0 --minimal)
#if [ -z "$NETWORK_UUID" ]; then
#  echo "Failed to discover Network UUID"
#  exit 1
#fi

#
# 2: Create new VM
#
echo "Creating Virtual Machine:"
echo "  Type:    $VM_TYPE"
echo "  Label:   $VM_LABEL"
echo "  CPUs:    $VM_MAX_VCPUS"
echo "  Memory:  $VM_MAX_DYNAMIC_MEM"
#echo "  Network: $NETWORK_UUID"
echo ""
echo "Importing VDI:"
echo "  Image: $VM_DISK_IMAGE ($VM_DISK_IMAGE_FORMAT)"
echo "  Size: $VM_DISK_SIZE bytes"
echo "  SR: $SR_UUID"
echo ""
echo "Press ENTER key to continue (or CTRL+C to cancel)..."
echo ""
read

VM_UUID=$(xe vm-install new-name-label=$VM_LABEL sr-uuid=$SR_UUID template=$VM_TEMPLATE)
if [ -z "$VM_UUID" ]; then
  echo "Failed to create VM"
  exit 1
fi

echo ">>> VM Created with UUID: ${VM_UUID}"

# Set up hardware parameters
xe vm-param-set VCPUs-max=$VM_MAX_VCPUS uuid=$VM_UUID
xe vm-param-set VCPUs-at-startup=$VM_STARTUP_VCPUS uuid=$VM_UUID
xe vm-param-set memory-static-max=$VM_MAX_STATIC_MEM uuid=$VM_UUID
xe vm-param-set memory-dynamic-max=$VM_MAX_DYNAMIC_MEM uuid=$VM_UUID
xe vm-param-set memory-dynamic-min=$VM_MIN_DYNAMIC_MEM uuid=$VM_UUID
xe vm-param-set memory-static-min=$VM_MIN_STATIC_MEM uuid=$VM_UUID

# Convert to PV if requested
if [ "${VM_TYPE}" == "PV" ]; then
  xe vm-param-set uuid=${VM_UUID} HVM-boot-policy=""
  xe vm-param-set uuid=${VM_UUID} PV-bootloader=pygrub
  xe vm-param-set uuid=${VM_UUID} PV-args="--quiet console=hvc0"

  #xe vm-param-set uuid=$UUID PV-bootloader-args="--kernel=$KERNEL_PATH --ramdisk=$RAMDISK_PATH"
  #xe vm-param-set uuid=$UUID PV-args="$KERNEL_ARGS console=hvc0 xencons=hvc0"
fi

#
# 3: Create disk
#
xe vm-disk-add uuid=$VM_UUID sr-uuid=$SR_UUID device=0 disk-size=$VM_DISK_SIZE

VBD_UUID=$(xe vbd-list vm-uuid=$VM_UUID userdevice=0 params=uuid --minimal)
if [ -z "$VBD_UUID" ]; then
  echo "Failed to create HDD"
  exit 1
fi

xe vbd-param-set bootable=true uuid=$VBD_UUID
echo ">>> VBD Created with UUID: ${VBD_UUID}"

DISK_UUID=$(xe vdi-list vbd-uuids=$VBD_UUID | grep -e "^uuid" | awk '{print $5}')
if [ -z "$DISK_UUID" ]; then
  echo "Something went wrong during disk creation, UUID not found"
  exit 1
fi
echo ">>> VDI Created with UUID: ${DISK_UUID}"

#
# 4: Import image
#

echo ">>> Importing image..."
#xe vdi-import uuid=$DISK_UUID filename=$VM_DISK_IMAGE format=$VM_DISK_IMAGE_FORMAT #--progress
cp $VM_DISK_IMAGE /var/run/sr-mount/${SR_UUID}/${DISK_UUID}.${VM_DISK_IMAGE_FORMAT}
xe vbd-param-set bootable=true uuid=$VBD_UUID
echo ">>> Imported and set bootable"

#
# 5: Create network connection
#
#NET_UUID=$(xe vif-create vm-uuid=$VM_UUID network-uuid=$NETWORK_UUID mac=random device=0)
#if [ -z "$NET_UUID" ]; then
#  echo "Failed to create NET"
#  exit 1
#fi

#echo ">>> VIF Created with UUID: ${DISK_UUID}"

#
# 6: Done
#

#echo "Starting up VM..."
#xe vm-start uuid=$VM_UUID
echo "Done ... :)"