diff --git a/tools/dockerfile/push_testing_images.sh b/tools/dockerfile/push_testing_images.sh
index f1ee8d59dd7e2db4651df7748c079fea96f26bae..9dceb29a8774ee34a64e261d0303cecb886cd289 100755
--- a/tools/dockerfile/push_testing_images.sh
+++ b/tools/dockerfile/push_testing_images.sh
@@ -44,7 +44,7 @@ cd -
 
 DOCKERHUB_ORGANIZATION=grpctesting
 
-for DOCKERFILE_DIR in tools/dockerfile/test/fuzzer
+for DOCKERFILE_DIR in tools/dockerfile/test/fuzzer tools/dockerfile/test/sanity
 do
   # Generate image name based on Dockerfile checksum. That works well as long
   # as can count on dockerfiles being written in a way that changing the logical 
diff --git a/tools/internal_ci/linux/grpc_pull_request_sanity.cfg b/tools/internal_ci/linux/grpc_pull_request_sanity.cfg
new file mode 100644
index 0000000000000000000000000000000000000000..511f2d6b35b3106048772c88e914a43c7bc100af
--- /dev/null
+++ b/tools/internal_ci/linux/grpc_pull_request_sanity.cfg
@@ -0,0 +1,39 @@
+# Copyright 2017, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_sanity.sh"
+timeout_mins: 30
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/tools/internal_ci/linux/grpc_sanity.sh b/tools/internal_ci/linux/grpc_sanity.sh
new file mode 100755
index 0000000000000000000000000000000000000000..fac25c75315d2369e03311edefdfc8a1bc23b569
--- /dev/null
+++ b/tools/internal_ci/linux/grpc_sanity.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Copyright 2017, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+# change to grpc repo root
+cd $(dirname $0)/../../..
+
+git submodule update --init
+
+# download base docker image from dockerhub
+export DOCKERHUB_ORGANIZATION=grpctesting
+tools/run_tests/run_tests.py -l sanity -c opt -t -x sponge_log.xml --use_docker --report_suite_name sanity_linux_opt
diff --git a/tools/run_tests/dockerize/build_docker_and_run_tests.sh b/tools/run_tests/dockerize/build_docker_and_run_tests.sh
index b68ac89121cb96948ec695f597cae04da860be97..f10916d19235f1284287e9f5111ec76fcc419072 100755
--- a/tools/run_tests/dockerize/build_docker_and_run_tests.sh
+++ b/tools/run_tests/dockerize/build_docker_and_run_tests.sh
@@ -47,12 +47,19 @@ mkdir -p /tmp/xdg-cache-home
 # Inputs
 # DOCKERFILE_DIR - Directory in which Dockerfile file is located.
 # DOCKER_RUN_SCRIPT - Script to run under docker (relative to grpc repo root)
+# DOCKERHUB_ORGANIZATION - If set, pull a prebuilt image from given dockerhub org.
 
 # Use image name based on Dockerfile location checksum
 DOCKER_IMAGE_NAME=$(basename $DOCKERFILE_DIR)_$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
 
-# Make sure docker image has been built. Should be instantaneous if so.
-docker build -t $DOCKER_IMAGE_NAME $DOCKERFILE_DIR
+if [ "$DOCKERHUB_ORGANIZATION" != "" ]
+then
+  DOCKER_IMAGE_NAME=$DOCKERHUB_ORGANIZATION/$DOCKER_IMAGE_NAME
+  docker pull $DOCKER_IMAGE_NAME
+else
+  # Make sure docker image has been built. Should be instantaneous if so.
+  docker build -t $DOCKER_IMAGE_NAME $DOCKERFILE_DIR
+fi
 
 # Choose random name for docker container
 CONTAINER_NAME="run_tests_$(uuidgen)"
diff --git a/tools/run_tests/dockerize/docker_run_tests.sh b/tools/run_tests/dockerize/docker_run_tests.sh
index eb220ae416fea16d82a26ffcba5c3e38cc9c21fd..0d260ffecaa31dd3606f22e4ff3de13f5a9ca322 100755
--- a/tools/run_tests/dockerize/docker_run_tests.sh
+++ b/tools/run_tests/dockerize/docker_run_tests.sh
@@ -68,6 +68,7 @@ cd ..
 
 zip -r reports.zip reports
 find . -name report.xml | xargs -r zip reports.zip
+find . -name sponge_log.xml | xargs -r zip reports.zip
 find . -name 'report_*.xml' | xargs -r zip reports.zip
 
 exit $exit_code