+# Modify tempest_conf.yaml file
+tempest_conf_file=${DOVETAIL_CONFIG}/tempest_conf.yaml
+if [[ ${INSTALLER_TYPE} == 'compass' || ${INSTALLER_TYPE} == 'apex' ]]; then
+ volume_device='vdb'
+else
+ volume_device='vdc'
+fi
+
+cat << EOF >$tempest_conf_file
+
+compute:
+ min_compute_nodes: 2
+ volume_device_name: ${volume_device}
+
+EOF
+
+echo "${tempest_conf_file}..."
+cat ${tempest_conf_file}
+
+cp_tempest_cmd="docker cp ${DOVETAIL_CONFIG}/tempest_conf.yaml $container_id:/home/opnfv/dovetail/dovetail/userconfig"
+echo "exec command: ${cp_tempest_cmd}"
+$cp_tempest_cmd
+