diff --git a/.github/workflows/ci-userspace-convertor.yml b/.github/workflows/ci-userspace-convertor.yml
index 2a5350db..202be4a0 100644
--- a/.github/workflows/ci-userspace-convertor.yml
+++ b/.github/workflows/ci-userspace-convertor.yml
@@ -45,8 +45,26 @@ jobs:
           docker run -d -p 5000:5000 --restart always --name registry registry:2
           sleep 3s
 
+      - name: Prepare Images
+        working-directory: ci/scripts
+        shell: bash
+        run: |
+          bash prepare_image.sh registry.hub.docker.com/overlaybd/centos:centos7.9.2009 localhost:5000/centos:centos7.9.2009 && \
+          bash prepare_image.sh registry.hub.docker.com/overlaybd/ubuntu:22.04          localhost:5000/ubuntu:22.04 && \
+          bash prepare_image.sh registry.hub.docker.com/overlaybd/redis:7.2.3           localhost:5000/redis:7.2.3 && \
+          bash prepare_image.sh registry.hub.docker.com/overlaybd/wordpress:6.4.2       localhost:5000/wordpress:6.4.2 && \
+          bash prepare_image.sh registry.hub.docker.com/overlaybd/nginx:1.25.3          localhost:5000/nginx:1.25.3
+
       - name: CI - uconv reproduce
         working-directory: ci/uconv_reproduce
         shell: bash
         run: |
           bash ci-uconv-reproduce.sh
+
+      - name: CI - uconv E2E
+        working-directory: ci/scripts
+        shell: bash
+        run: |
+          /opt/overlaybd/snapshotter/convertor -r localhost:5000/redis -i 7.2.3 --overlaybd 7.2.3_overlaybd --turboOCI 7.2.3_turbo
+          bash run_container.sh localhost:5000/redis:7.2.3_overlaybd
+          bash run_container.sh localhost:5000/redis:7.2.3_turbo
diff --git a/ci/build_image/Dockerfile b/ci/build_image/Dockerfile
index ce4d9b5f..f465b6ec 100644
--- a/ci/build_image/Dockerfile
+++ b/ci/build_image/Dockerfile
@@ -48,10 +48,8 @@ RUN apt-get update && apt-get install -y apt-transport-https ca-certificates cur
       "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
       $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null && \
     apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
-
-RUN \
-    apt update && apt install -y libnl-3-200 libnl-genl-3-200 libcurl4-openssl-dev libaio-dev wget less kmod && \
+    apt-get install -y libnl-3-200 libnl-genl-3-200 libcurl4-openssl-dev libaio-dev wget less kmod && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* && \
     wget https://github.com/containerd/overlaybd/releases/download/v${OBD_VERSION}/overlaybd-${OBD_VERSION}-0ubuntu1.22.04.x86_64.deb && \
     dpkg -i overlaybd-${OBD_VERSION}-0ubuntu1.22.04.x86_64.deb && \
     dpkg -i overlaybd-snapshotter_${RELEASE_VERSION}_amd64.deb && \
diff --git a/ci/scripts/prepare_image.sh b/ci/scripts/prepare_image.sh
new file mode 100755
index 00000000..a2779005
--- /dev/null
+++ b/ci/scripts/prepare_image.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+from=${1:?}
+to=${2:?}
+
+set -e
+
+ctr i pull "${from}"
+ctr i tag "${from}" "${to}"
+ctr i push "${to}"
+ctr i rm "${from}"
diff --git a/ci/scripts/run_container.sh b/ci/scripts/run_container.sh
new file mode 100755
index 00000000..17886dae
--- /dev/null
+++ b/ci/scripts/run_container.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+#
+# rpull and run on-demand
+
+image=$1
+container_name=${2:-test}
+
+/opt/overlaybd/snapshotter/ctr rpull "${image}"
+ctr run -d --net-host --snapshotter=overlaybd "${image}" "${container_name}"
+ctr t ls | grep "${container_name}"
+ctr t kill -s 9 "${container_name}" && sleep 5s && ctr t ls
+ctr c rm "${container_name}" && ctr c ls
+ctr i rm "${image}"
diff --git a/ci/uconv_reproduce/ci-uconv-reproduce.sh b/ci/uconv_reproduce/ci-uconv-reproduce.sh
index c12bd4cd..558f329f 100644
--- a/ci/uconv_reproduce/ci-uconv-reproduce.sh
+++ b/ci/uconv_reproduce/ci-uconv-reproduce.sh
@@ -11,11 +11,6 @@ result=0
 
 for image in "${images[@]}"
 do
-    from_img="registry.hub.docker.com/overlaybd/${image}"
-    ctr i pull "${from_img}" &> /dev/null
-    ctr i tag "${from_img}" "${registry}/${image}" &> /dev/null
-    ctr i push "${registry}/${image}" &> /dev/null
-
     img=${image%%":"*}
     tag=${image##*":"}
     echo "${img} ${tag}"