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diff --git a/ci/envs/guest-modify.sh b/ci/envs/guest-modify.sh
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+++ b/ci/envs/guest-modify.sh
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+#!/bin/bash
+
+##############################################################################
+# Copyright (c) 2015 Ericsson AB and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+# This is copy from yardstick-img-modify on yardstick project. Currently 
+# yardstick script only ubuntu image, and this one is more for CentOS.
+# Example invocation:
+# yardstick-img-modify /home/yardstick/tools/ubuntu-server-cloudimg-modify.sh
+#
+# Warning: the script will create files by default in:
+#   /tmp/workspace/yardstick
+# the files will be owned by root!
+#
+# TODO: image resize is needed if the base image is too small
+#
+
+set -e
+set -x
+
+die() {
+    echo "error: $1" >&2
+    exit 1
+}
+
+usage () {
+    echo "$0 cmd workspace"
+    exit 1
+}
+
+test $# -eq 2 || usage
+test $(id -u) -eq 0 || die "should invoke using sudo"
+
+ROOTDIR=$(cd $(dirname "$0")/../.. && pwd)
+cmd=$1
+test -x $cmd
+workspace=$2
+mountdir=`mktemp -d`
+
+image_url=${IMAGE_URL:-"http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud-1510.qcow2"}
+md5sums_url=${MD5SUMS_URL:-"http://cloud.centos.org/centos/7/images/sha256sum.txt"}
+
+imgfile="${workspace}/guest.img"
+raw_imgfile="${workspace}/guest.raw"
+filename=$(basename $image_url)
+md5filename=$(basename $md5sums_url)
+
+# download and checksum base image, conditionally if local copy is outdated
+download() {
+    test -d $workspace || mkdir -p $workspace
+    cd $workspace
+    rm -f $md5filename # always download the checksum file to a detect stale image
+    wget $md5sums_url
+    test -e $filename || wget -nc $image_url
+    grep "$filename\$" $md5filename |sha256sum -c
+    if [ $? -ne 0 ]; then
+        rm $filename
+        wget -nc $image_url
+        grep $filename $md5filename | md5sum -c
+    fi
+    rm -rf $raw_imgfile
+    qemu-img convert $filename $raw_imgfile
+    cd -
+}
+
+# mount image
+setup() {
+    mkdir -p $mountdir
+
+    loopdevice=$(kpartx -l $raw_imgfile | head -1 | cut -f1 -d ' ')
+
+    kpartx -a $raw_imgfile
+    # No idea why need this sleep
+    sleep 3
+    mount /dev/mapper/$loopdevice $mountdir
+
+    cp $cmd "$mountdir/"
+}
+
+# modify image running a script using in a chrooted environment
+modify() {
+    # Add the ssh key to the image
+    mkdir -p ${mountdir}/root/.ssh
+    cp ${ROOTDIR}/ci/envs/kvm4nfv_key.pub ${mountdir}/root/.ssh/authorized_keys
+    chmod 700 ${mountdir}/root/.ssh
+    chmod 600 ${mountdir}/root/.ssh/authorized_keys
+    
+
+    umount $mountdir
+
+    qemu-img convert -O qcow2 $raw_imgfile $imgfile
+}
+
+# cleanup (umount) the image
+cleanup() {
+    # designed to be idempotent
+    mount | grep $mountdir && umount $mountdir
+    kpartx -d $raw_imgfile || true
+    rm -f $raw_imgfile
+    rm -rf $mountdir
+}
+
+exitcode=""
+error_trap()
+{
+    local rc=$?
+
+    set +e
+
+    if [ -z "$exitcode" ]; then
+        exitcode=$rc
+    fi
+
+    cleanup
+
+    echo "Image build failed with $exitcode"
+
+    exit $exitcode
+}
+
+main() {
+    cleanup
+
+    trap "error_trap" EXIT SIGTERM
+
+    download
+    setup
+    modify
+
+    trap - EXIT SIGTERM
+    cleanup
+
+    echo "the modified image is found here: $imgfile"
+}
+
+main