diff -uNr a/heartbeat/VirtualDomain b/heartbeat/VirtualDomain

--- a/heartbeat/VirtualDomain	2018-06-29 14:05:02.000000000 +0200

+++ b/heartbeat/VirtualDomain	2018-07-03 14:01:25.892705351 +0200

@@ -26,6 +26,9 @@

 OCF_RESKEY_CRM_meta_timeout_default=90000

 OCF_RESKEY_save_config_on_stop_default=false

 OCF_RESKEY_sync_config_on_stop_default=false

+OCF_RESKEY_backingfile_default=""

+OCF_RESKEY_stateless_default="false"

+OCF_RESKEY_copyindirs_default=""

 : ${OCF_RESKEY_migration_downtime=${OCF_RESKEY_migration_downtime_default}}

 : ${OCF_RESKEY_migration_speed=${OCF_RESKEY_migration_speed_default}}

@@ -36,6 +39,9 @@

 : ${OCF_RESKEY_CRM_meta_timeout=${OCF_RESKEY_CRM_meta_timeout_default}}

 : ${OCF_RESKEY_save_config_on_stop=${OCF_RESKEY_save_config_on_stop_default}}

 : ${OCF_RESKEY_sync_config_on_stop=${OCF_RESKEY_sync_config_on_stop_default}}

+: ${OCF_RESKEY_backingfile=${OCF_RESKEY_backingfile_default}}

+: ${OCF_RESKEY_stateless=${OCF_RESKEY_stateless_default}}

+: ${OCF_RESKEY_copyindirs=${OCF_RESKEY_copyindirs_default}}

 if ocf_is_true ${OCF_RESKEY_sync_config_on_stop}; then

 	OCF_RESKEY_save_config_on_stop="true"

@@ -271,6 +277,35 @@

 <content type="string" default=""/>

 </parameter>

+<parameter name="backingfile" unique="0" required="0">

+<longdesc lang="en">

+When the VM is used in Copy-On-Write mode, this is the backing file to use (with its full path).

+The VMs image will be created based on this backing file.

+This backing file will never be changed during the life of the VM.

+</longdesc>

+<shortdesc lang="en">If the VM is wanted to work with Copy-On-Write mode, this is the backing file to use (with its full path)</shortdesc>

+<content type="string" default="${OCF_RESKEY_backingfile_default}" />

+</parameter>

+

+<parameter name="stateless" unique="0" required="0">

+<longdesc lang="en">

+If set to true and backingfile is defined, the start of the VM will systematically create a new qcow2 based on

+the backing file, therefore the VM will always be stateless.  If set to false, the start of the VM will use the

+COW (<vmname>.qcow2) file if it exists, otherwise the first start will create a new qcow2 based on the backing

+file given as backingfile.

+</longdesc>

+<shortdesc lang="en">If set to true, the (<vmname>.qcow2) file will be re-created at each start, based on the backing file (if defined)</shortdesc>

+<content type="boolean" default="${OCF_RESKEY_stateless_default}" />

+</parameter>

+

+<parameter name="copyindirs" unique="0" required="0">

+<longdesc lang="en">

+List of directories for the virt-copy-in before booting the VM. Used only in stateless mode.

+</longdesc>

+<shortdesc lang="en">List of directories for the virt-copy-in before booting the VM stateless mode.</shortdesc>

+<content type="string" default="${OCF_RESKEY_copyindirs_default}" />

+</parameter>

+

 <parameter name="shutdown_mode">

 <longdesc lang="en">

 virsh shutdown method to use. Please verify that it is supported by your virsh toolsed with 'virsh help shutdown'

@@ -545,11 +580,49 @@

 	# is restored to an 'undefined' state before creating.

 	verify_undefined

-	virsh $VIRSH_OPTIONS create ${OCF_RESKEY_config}

-	rc=$?

-	if [ $rc -ne 0 ]; then

-		ocf_exit_reason "Failed to start virtual domain ${DOMAIN_NAME}."

-		return $OCF_ERR_GENERIC

+	if [ -z "${OCF_RESKEY_backingfile}" ]; then

+		virsh $VIRSH_OPTIONS create ${OCF_RESKEY_config}

+		if [ $? -ne 0 ]; then

+			ocf_exit_reason "Failed to start virtual domain ${DOMAIN_NAME}."

+			return $OCF_ERR_GENERIC

+		fi

+	else

+		if ocf_is_true "${OCF_RESKEY_stateless}" || [ ! -s "${OCF_RESKEY_config%%.*}.qcow2" ]; then

+			# Create the Stateless image

+			dirconfig=`dirname ${OCF_RESKEY_config}`

+			qemu-img create -f qcow2 -b ${OCF_RESKEY_backingfile} ${OCF_RESKEY_config%%.*}.qcow2

+			if [ $? -ne 0 ]; then

+				ocf_exit_reason "Failed qemu-img create ${DOMAIN_NAME} with backing file ${OCF_RESKEY_backingfile}."

+				return $OCF_ERR_GENERIC

+			fi

+

+			virsh define ${OCF_RESKEY_config}

+			if [ $? -ne 0 ]; then

+				ocf_exit_reason "Failed to define virtual domain ${DOMAIN_NAME}."

+				return $OCF_ERR_GENERIC

+			fi

+

+			if [ -n "${OCF_RESKEY_copyindirs}" ]; then

+				# Inject copyindirs directories and files

+				virt-copy-in -d ${DOMAIN_NAME}  ${OCF_RESKEY_copyindirs}  /

+				if [ $? -ne 0 ]; then

+					ocf_exit_reason "Failed on virt-copy-in command ${DOMAIN_NAME}."

+					return $OCF_ERR_GENERIC

+				fi

+			fi

+		else

+			virsh define ${OCF_RESKEY_config}

+			if [ $? -ne 0 ]; then

+				ocf_exit_reason "Failed to define virtual domain ${DOMAIN_NAME}."

+				return $OCF_ERR_GENERIC

+			fi

+		fi

+

+		virsh $VIRSH_OPTIONS start ${DOMAIN_NAME}

+		if [ $? -ne 0 ]; then

+			ocf_exit_reason "Failed to start virtual domain ${DOMAIN_NAME}."

+			return $OCF_ERR_GENERIC

+		fi

 	fi

 	while ! VirtualDomain_monitor; do

@@ -926,6 +999,11 @@

 		ocf_exit_reason "migration_downtime has to be a decimal value"

 		return $OCF_ERR_CONFIGURED

 	fi

+

+	if ocf_is_true "${OCF_RESKEY_stateless}" && [ -z "${OCF_RESKEY_backingfile}" ]; then

+		ocf_exit_reason "Stateless functionality can't be achieved without a backing file."

+		return $OCF_ERR_CONFIGURED

+	fi

 }

 VirtualDomain_getconfig() {