diff --git a/dockerfiles/Dockerfile-centos b/dockerfiles/Dockerfile-centos
index 73a067f..36c7e93 100644
--- a/dockerfiles/Dockerfile-centos
+++ b/dockerfiles/Dockerfile-centos
@@ -1,7 +1,6 @@
 FROM centos:7
 
-ENV PATH=/virtualenv/bin:${PATH} \
-    PROJECT=glance
+ENV PROJECT=glance
 ARG DOCKER_REPO=yaodu/openstack-requirements
 ARG DOCKER_TAG=centos
 ARG WHEELS
@@ -35,19 +34,17 @@ RUN set -x \
     && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
-    && pip install virtualenv \
-    && virtualenv /virtualenv \
-    && hash -r \
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
     && groupadd -g 42424 ${PROJECT} \
     && useradd -u 42424 -g ${PROJECT} -M -d /var/lib/${PROJECT} -s /usr/sbin/nologin -c "${PROJECT} user" ${PROJECT} \
     && mkdir -p /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
     && chown ${PROJECT}:${PROJECT} /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
 # common install end
 # Project specific command block start
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
 # Project specific command block end
     && yum history -y undo $(yum history list git | tail -2 | head -1 | awk '{ print $1}') \
     && yum clean all \
     && rm -rf /tmp/* /root/.cache \
-    && find / -type f \( -name "*.pyc" -o -name "pip" -o -name "easy_install" -o -name "wheel" \) -delete
+    && pip uninstall pip wheel -y \
+    && find / -type f -name "*.pyc" -delete
diff --git a/dockerfiles/Dockerfile-debian b/dockerfiles/Dockerfile-debian
index 87b44ff..d26da1e 100644
--- a/dockerfiles/Dockerfile-debian
+++ b/dockerfiles/Dockerfile-debian
@@ -1,7 +1,6 @@
 FROM debian:jessie
 
-ENV PATH=/virtualenv/bin:${PATH} \
-    PROJECT=glance
+ENV PROJECT=glance
 ARG DOCKER_REPO=yaodu/openstack-requirements
 ARG DOCKER_TAG=latest
 ARG WHEELS
@@ -39,18 +38,16 @@ RUN set -x \
     && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
-    && pip install virtualenv \
-    && virtualenv --system-site-packages /virtualenv \
-    && hash -r \
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
     && groupadd -g 42424 ${PROJECT} \
     && useradd -u 42424 -g ${PROJECT} -M -d /var/lib/${PROJECT} -s /usr/sbin/nologin -c "${PROJECT} user" ${PROJECT} \
     && mkdir -p /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
     && chown ${PROJECT}:${PROJECT} /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
 # common install end
 # Project specific command block start
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
 # Project specific command block end
     && apt-get purge -y --auto-remove ca-certificates curl git \
     && rm -rf /var/lib/apt/lists/* /tmp/* /root/.cache \
-    && find / -type f \( -name "*.pyc" -o -name "pip" -o -name "easy_install" -o -name "wheel" \) -delete
+    && pip uninstall pip wheel -y \
+    && find / -type f -name "*.pyc" -delete
diff --git a/dockerfiles/Dockerfile-ubuntu b/dockerfiles/Dockerfile-ubuntu
index 1ff2620..4a08839 100644
--- a/dockerfiles/Dockerfile-ubuntu
+++ b/dockerfiles/Dockerfile-ubuntu
@@ -1,7 +1,6 @@
 FROM ubuntu:xenial
 
-ENV PATH=/virtualenv/bin:${PATH} \
-    PROJECT=glance
+ENV PROJECT=glance
 ARG DOCKER_REPO=yaodu/openstack-requirements
 ARG DOCKER_TAG=ubuntu
 ARG WHEELS
@@ -39,18 +38,16 @@ RUN set -x \
     && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
     && python get-pip.py \
     && rm get-pip.py \
-    && pip install virtualenv \
-    && virtualenv --system-site-packages /virtualenv \
-    && hash -r \
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \
     && groupadd -g 42424 ${PROJECT} \
     && useradd -u 42424 -g ${PROJECT} -M -d /var/lib/${PROJECT} -s /usr/sbin/nologin -c "${PROJECT} user" ${PROJECT} \
     && mkdir -p /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
     && chown ${PROJECT}:${PROJECT} /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \
 # common install end
 # Project specific command block start
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt python-memcached pymysql \
 # Project specific command block end
     && apt-get purge -y --auto-remove ca-certificates curl git \
     && rm -rf /var/lib/apt/lists/* /tmp/* /root/.cache \
-    && find / -type f \( -name "*.pyc" -o -name "pip" -o -name "easy_install" -o -name "wheel" \) -delete
+    && pip uninstall pip wheel -y \
+    && find / -type f -name "*.pyc" -delete
diff --git a/update.sh b/update.sh
index 54c61f3..2fc69dd 100755
--- a/update.sh
+++ b/update.sh
@@ -24,10 +24,7 @@ COMMON_INSTALL=$(cat <<'END_HEREDOC'
     && curl -sSL https://bootstrap.pypa.io/get-pip.py -o get-pip.py \\\n\
     && python get-pip.py \\\n\
     && rm get-pip.py \\\n\
-    && pip install virtualenv \\\n\
-    && virtualenv /virtualenv \\\n\
-    && hash -r \\\n\
-    && pip install --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \\\n\
+    && pip install --no-cache-dir --no-index --no-compile --find-links /tmp/packages --constraint /tmp/packages/upper-constraints.txt /tmp/${PROJECT} \\\n\
     && groupadd -g 42424 ${PROJECT} \\\n\
     && useradd -u 42424 -g ${PROJECT} -M -d /var/lib/${PROJECT} -s /usr/sbin/nologin -c "${PROJECT} user" ${PROJECT} \\\n\
     && mkdir -p /etc/${PROJECT} /var/log/${PROJECT} /var/lib/${PROJECT} /var/cache/${PROJECT} \\\n\