diff --git a/.circleci/cimodel/data/pytorch_build_definitions.py b/.circleci/cimodel/data/pytorch_build_definitions.py
index b560aa33bd6..6ef69b616e0 100644
--- a/.circleci/cimodel/data/pytorch_build_definitions.py
+++ b/.circleci/cimodel/data/pytorch_build_definitions.py
@@ -11,6 +11,11 @@ from typing import List, Optional
 
 DOCKER_IMAGE_PATH_BASE = "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/"
 
+# ARE YOU EDITING THIS NUMBER?  MAKE SURE YOU READ THE GUIDANCE AT THE
+# TOP OF .circleci/config.yml
+DOCKER_IMAGE_VERSION = "9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
+
+
 @dataclass
 class Conf:
     distro: str
@@ -55,14 +60,11 @@ class Conf:
         return result
 
     def gen_docker_image_path(self):
-        return miniutils.quote(
-            DOCKER_IMAGE_PATH_BASE + self.gen_docker_image_name()
-        )
 
-    def gen_docker_image_name(self):
         parms_source = self.parent_build or self
         base_build_env_name = "-".join(parms_source.get_parms(True))
-        return base_build_env_name
+
+        return miniutils.quote(DOCKER_IMAGE_PATH_BASE + base_build_env_name + ":" + str(DOCKER_IMAGE_VERSION))
 
     def get_build_job_name_pieces(self, build_or_test):
         return self.get_parms(False) + [build_or_test]
@@ -95,9 +97,6 @@ class Conf:
         job_def["name"] = self.gen_build_name(phase)
         job_def["requires"] = ["setup"]
 
-        if phase == "build":
-            job_def["requires"].append(miniutils.quote("docker-" + self.gen_docker_image_name()))
-
         if phase == "test":
 
             # TODO When merging the caffe2 and pytorch jobs, it might be convenient for a while to make a
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 481d7889da5..c0db5477b3b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -39,21 +39,6 @@ commands:
           name: Attaching workspace
           at: ~/workspace
 
-  # Must be run after attaching workspace from previous steps
-  load_shared_env:
-    description: "Loads .circleci/shared/env_file into ${BASH_ENV}"
-    parameters:
-      # For some weird reason we decide to reattach our workspace to ~/workspace so
-      # in the vein of making it simple let's assume our share env_file is here
-      root:
-        type: string
-        default: "~/workspace"
-    steps:
-      - run:
-          name: "Load .circleci/shared/env_file into ${BASH_ENV}"
-          command: |
-            cat << parameters.root >>/.circleci/shared/env_file >> ${BASH_ENV}
-
   # This system setup script is meant to run before the CI-related scripts, e.g.,
   # installing Git client, checking out code, setting up CI env, and
   # building/testing.
@@ -416,7 +401,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - optional_merge_target_branch
@@ -427,9 +411,9 @@ jobs:
         command: |
           set -e
           # Pull Docker image and run build
-          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}:${DOCKER_TAG}
-          time docker pull ${DOCKER_IMAGE}:${DOCKER_TAG} >/dev/null
-          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE}:${DOCKER_TAG})
+          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}
+          time docker pull ${DOCKER_IMAGE} >/dev/null
+          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE})
 
           git submodule sync && git submodule update -q --init --recursive
 
@@ -452,7 +436,7 @@ jobs:
             # The xla build uses the same docker image as
             # pytorch-linux-trusty-py3.6-gcc5.4-build. In the push step, we have to
             # distinguish between them so the test can pick up the correct image.
-            output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+            output_image=${DOCKER_IMAGE}-${CIRCLE_SHA1}
             if [[ ${BUILD_ENVIRONMENT} == *"xla"* ]]; then
               export COMMIT_DOCKER_IMAGE=$output_image-xla
             elif [[ ${BUILD_ENVIRONMENT} == *"libtorch"* ]]; then
@@ -479,7 +463,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -488,7 +471,7 @@ jobs:
         command: |
           set -e
           # See Note [Special build images]
-          output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          output_image=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           if [[ ${BUILD_ENVIRONMENT} == *"xla"* ]]; then
             export COMMIT_DOCKER_IMAGE=$output_image-xla
           elif [[ ${BUILD_ENVIRONMENT} == *"libtorch"* ]]; then
@@ -1296,14 +1279,13 @@ jobs:
     environment:
       BUILD_ENVIRONMENT: pytorch-python-doc-push
       # TODO: stop hardcoding this
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -1311,7 +1293,7 @@ jobs:
         no_output_timeout: "1h"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
@@ -1348,14 +1330,13 @@ jobs:
   pytorch_cpp_doc_push:
     environment:
       BUILD_ENVIRONMENT: pytorch-cpp-doc-push
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -1363,7 +1344,7 @@ jobs:
         no_output_timeout: "1h"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
@@ -1459,7 +1440,7 @@ jobs:
   pytorch_android_gradle_build:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-build
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
@@ -1474,7 +1455,7 @@ jobs:
         no_output_timeout: "1h"
         command: |
           set -eux
-          docker_image_commit=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          docker_image_commit=${DOCKER_IMAGE}-${CIRCLE_SHA1}
 
           docker_image_libtorch_android_x86_32=${docker_image_commit}-android-x86_32
           docker_image_libtorch_android_x86_64=${docker_image_commit}-android-x86_64
@@ -1545,14 +1526,13 @@ jobs:
   pytorch_android_publish_snapshot:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-publish-snapshot
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - setup_ci_environment
@@ -1561,7 +1541,7 @@ jobs:
         no_output_timeout: "1h"
         command: |
           set -eux
-          docker_image_commit=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          docker_image_commit=${DOCKER_IMAGE}-${CIRCLE_SHA1}
 
           docker_image_libtorch_android_x86_32_gradle=${docker_image_commit}-android-x86_32-gradle
 
@@ -1582,14 +1562,13 @@ jobs:
   pytorch_android_gradle_build-x86_32:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-build-only-x86_32
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     - attach_scripts
-    - load_shared_env
     - run:
         name: filter out not PR runs
         no_output_timeout: "5m"
@@ -1606,7 +1585,7 @@ jobs:
         no_output_timeout: "1h"
         command: |
           set -e
-          docker_image_libtorch_android_x86_32=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}-android-x86_32
+          docker_image_libtorch_android_x86_32=${DOCKER_IMAGE}-${CIRCLE_SHA1}-android-x86_32
           echo "docker_image_libtorch_android_x86_32: "${docker_image_libtorch_android_x86_32}
 
           # x86
@@ -1751,7 +1730,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - setup_ci_environment
@@ -1761,9 +1739,9 @@ jobs:
         command: |
           set -e
           # Pull Docker image and run build
-          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}:${DOCKER_TAG}
-          time docker pull ${DOCKER_IMAGE}:${DOCKER_TAG} >/dev/null
-          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE}:${DOCKER_TAG})
+          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}
+          time docker pull ${DOCKER_IMAGE} >/dev/null
+          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE})
 
           echo "Do NOT merge master branch into $CIRCLE_BRANCH in environment $BUILD_ENVIRONMENT"
 
@@ -1778,7 +1756,7 @@ jobs:
           # Push intermediate Docker image for next phase to use
           if [ -z "${BUILD_ONLY}" ]; then
             # Augment our output image name with bazel to avoid collisions
-            output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-bazel-${CIRCLE_SHA1}
+            output_image=${DOCKER_IMAGE}-bazel-${CIRCLE_SHA1}
             export COMMIT_DOCKER_IMAGE=$output_image
             docker commit "$id" ${COMMIT_DOCKER_IMAGE}
             time docker push ${COMMIT_DOCKER_IMAGE}
@@ -1791,7 +1769,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -1799,7 +1776,7 @@ jobs:
         no_output_timeout: "90m"
         command: |
           set -e
-          output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-bazel-${CIRCLE_SHA1}
+          output_image=${DOCKER_IMAGE}-bazel-${CIRCLE_SHA1}
           export COMMIT_DOCKER_IMAGE=$output_image
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
 
@@ -1832,14 +1809,14 @@ jobs:
   pytorch_doc_test:
     environment:
       BUILD_ENVIRONMENT: pytorch-doc-test
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      # TODO: stop hardcoding this
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: medium
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -1847,7 +1824,7 @@ jobs:
         no_output_timeout: "30m"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
@@ -1991,45 +1968,8 @@ jobs:
       resource_class: large
       environment:
         IMAGE_NAME: << parameters.image_name >>
-        # Enable 'docker manifest'
-        DOCKER_CLI_EXPERIMENTAL: "enabled"
-        DOCKER_BUILDKIT: 1
       steps:
         - checkout
-        - run:
-            name: Calculate docker tag
-            command: |
-              set -x
-              mkdir .circleci/shared
-              # git keeps a hash of all sub trees
-              echo "export DOCKER_TAG=$(git rev-parse HEAD:.circleci/docker)" >> .circleci/shared/env_file
-        # Saves our calculated docker tag to our workpace for later use
-        - persist_to_workspace:
-            root: .
-            paths:
-              - .circleci/shared/
-        - load_shared_env:
-            root: .
-        - run:
-            name: Check if image should be built
-            command: |
-              set +x
-              export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
-              export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
-              eval $(aws ecr get-login --no-include-email --region us-east-1)
-              set -x
-              # Check if image already exists, if it does then skip building it
-              if docker manifest inspect "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/${IMAGE_NAME}:${DOCKER_TAG}"; then
-                circleci-agent step halt
-              fi
-              PREVIOUS_DOCKER_TAG=$(git rev-parse "$(git merge-base HEAD << pipeline.git.base_revision >>):.circleci/docker")
-              # If no image exists but the hash is the same as the previous hash then we should error out here
-              # no stampeding herd effect plz.
-              if [[ ${PREVIOUS_DOCKER_TAG} = ${DOCKER_TAG} ]]; then
-                echo "ERROR: Something has gone wrong and the previous image isn't available for the merge-base of your branch"
-                echo "       contact the PyTorch team to restore the original images"
-                exit 1
-              fi
         - run:
             name: build_docker_image_<< parameters.image_name >>
             no_output_timeout: "1h"
@@ -2038,9 +1978,7 @@ jobs:
               export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
               export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
               set -x
-              source .circleci/shared/env_file
               cd .circleci/docker && ./build_docker.sh
-
   docker_for_ecr_gc_build_job:
       machine:
         image: ubuntu-1604:201903-01
@@ -2067,25 +2005,14 @@ jobs:
           type: string
       environment:
         PROJECT: << parameters.project >>
-        # TODO: Remove legacy image tags once we feel comfortable with new docker image tags
         IMAGE_TAG: << parameters.tags_to_keep >>
       docker:
         - image: 308535385114.dkr.ecr.us-east-1.amazonaws.com/gc/ecr
           aws_auth:
             aws_access_key_id: ${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
             aws_secret_access_key: ${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
+
       steps:
-        - checkout
-        - run:
-            # NOTE: see 'docker_build_job' for how these tags actually get built
-            name: dynamically generate tags to keep
-            no_output_timeout: "1h"
-            command: |
-              GENERATED_IMAGE_TAG=$(\
-                git log --oneline --pretty='%H' .circleci/docker \
-                  | xargs -I '{}' git rev-parse '{}:.circleci/docker' \
-                  | paste -sd "," -)
-              echo "export GENERATED_IMAGE_TAG='${GENERATED_IMAGE_TAG}'" >> ${BASH_ENV}
         - run:
             name: garbage collecting for ecr images
             no_output_timeout: "1h"
@@ -2094,7 +2021,7 @@ jobs:
               export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
               export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
               set -x
-              /usr/bin/gc.py --filter-prefix ${PROJECT}  --ignore-tags "${IMAGE_TAG},${GENERATED_IMAGE_TAG}"
+              /usr/bin/gc.py --filter-prefix ${PROJECT}  --ignore-tags ${IMAGE_TAG}
 
   docker_hub_index_job:
       docker:
@@ -2471,7 +2398,6 @@ workflows:
           name: pytorch_linux_xenial_pynightly_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-pynightly"
           filters:
             branches:
               only:
@@ -2479,7 +2405,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-pynightly-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-pynightly"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-pynightly:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_pynightly_test
           requires:
@@ -2492,22 +2418,21 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-pynightly-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-pynightly"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-pynightly:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_6_gcc5_4_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3.6-gcc5.4"
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_6_gcc5_4_test
           requires:
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_python_doc_push:
           requires:
@@ -2524,13 +2449,12 @@ workflows:
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-backward-compatibility-check-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_paralleltbb_linux_xenial_py3_6_gcc5_4_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3.6-gcc5.4"
           filters:
             branches:
               only:
@@ -2538,7 +2462,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-paralleltbb-linux-xenial-py3.6-gcc5.4-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_paralleltbb_linux_xenial_py3_6_gcc5_4_test
           requires:
@@ -2551,13 +2475,12 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-paralleltbb-linux-xenial-py3.6-gcc5.4-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_parallelnative_linux_xenial_py3_6_gcc5_4_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3.6-gcc5.4"
           filters:
             branches:
               only:
@@ -2565,7 +2488,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-parallelnative-linux-xenial-py3.6-gcc5.4-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_parallelnative_linux_xenial_py3_6_gcc5_4_test
           requires:
@@ -2578,13 +2501,12 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-parallelnative-linux-xenial-py3.6-gcc5.4-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_6_gcc7_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3.6-gcc7"
           filters:
             branches:
               only:
@@ -2592,7 +2514,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_6_gcc7_test
           requires:
@@ -2605,28 +2527,26 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_asan_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3-clang5-asan"
           build_environment: "pytorch-linux-xenial-py3-clang5-asan-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_clang5_asan_test
           requires:
             - setup
             - pytorch_linux_xenial_py3_clang5_asan_build
           build_environment: "pytorch-linux-xenial-py3-clang5-asan-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_linux_xenial_cuda9_2_cudnn7_py3_gcc7_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
           filters:
             branches:
               only:
@@ -2634,7 +2554,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_cuda9_2_cudnn7_py3_gcc7_test
           requires:
@@ -2647,14 +2567,13 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_build:
           name: pytorch_linux_xenial_cuda10_1_cudnn7_py3_gcc7_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
           filters:
             branches:
               only:
@@ -2662,7 +2581,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_cuda10_1_cudnn7_py3_gcc7_test
           requires:
@@ -2675,7 +2594,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -2690,7 +2609,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-multigpu-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.large
       - pytorch_linux_test:
@@ -2705,7 +2624,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-NO_AVX2-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -2720,7 +2639,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-NO_AVX-NO_AVX2-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -2735,7 +2654,7 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-slow-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -2750,52 +2669,48 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-nogpu-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
           build_environment: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_test
           requires:
             - setup
             - pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_build:
           name: pytorch_libtorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
           build_environment: "pytorch-libtorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_libtorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_test
           requires:
             - setup
             - pytorch_libtorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-libtorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_android_ndk_r19c_x86_32_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_32-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_android_ndk_r19c_x86_64_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           filters:
             branches:
               only:
@@ -2803,12 +2718,11 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_64-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_android_ndk_r19c_arm_v7a_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           filters:
             branches:
               only:
@@ -2816,12 +2730,11 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v7a-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_android_ndk_r19c_arm_v8a_build
           requires:
             - setup
-            - "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           filters:
             branches:
               only:
@@ -2829,36 +2742,34 @@ workflows:
                 - /ci-all\/.*/
                 - /release\/.*/
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v8a-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_bionic_py3_6_clang9_build
           requires:
             - setup
-            - "docker-pytorch-linux-bionic-py3.6-clang9"
           build_environment: "pytorch-linux-bionic-py3.6-clang9-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_bionic_py3_6_clang9_test
           requires:
             - setup
             - pytorch_linux_bionic_py3_6_clang9_build
           build_environment: "pytorch-linux-bionic-py3.6-clang9-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_build:
           name: pytorch_xla_linux_bionic_py3_6_clang9_build
           requires:
             - setup
-            - "docker-pytorch-linux-bionic-py3.6-clang9"
           build_environment: "pytorch-xla-linux-bionic-py3.6-clang9-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_xla_linux_bionic_py3_6_clang9_test
           requires:
             - setup
             - pytorch_xla_linux_bionic_py3_6_clang9_build
           build_environment: "pytorch-xla-linux-bionic-py3.6-clang9-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-bionic-py3.6-clang9:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       # Warning: indentation here matters!
 
@@ -2925,32 +2836,28 @@ workflows:
           name: pytorch_linux_xenial_py3_clang5_mobile_build
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-asan
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-build"
           build_only: "1"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_custom_build_static
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-asan
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-custom-build-static"
           build_only: "1"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_custom_build_dynamic
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-custom-build-dynamic"
           build_only: "1"
           # Use LLVM-DEV toolchain in android-ndk-r19c docker image
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_code_analysis
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
           # Most of this CI is already covered by "mobile-custom-build-dynamic" job
           filters:
             branches:
@@ -2961,14 +2868,14 @@ workflows:
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-code-analysis"
           build_only: "1"
           # Use LLVM-DEV toolchain in android-ndk-r19c docker image
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_6_gcc5_4_ge_config_legacy_test
           requires:
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-ge_config_legacy-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_6_gcc5_4_ge_config_profiling_test
@@ -2976,7 +2883,7 @@ workflows:
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-ge_config_profiling-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_test:
           name: pytorch_linux_xenial_cuda10_2_cudnn7_py3_ge_config_legacy_test
@@ -2984,7 +2891,7 @@ workflows:
             - setup
             - pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-ge_config_legacy-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -2993,16 +2900,15 @@ workflows:
             - setup
             - pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-ge_config_profiling-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_bazel_build:
           name: pytorch_bazel_build
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3.6-gcc7
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-bazel-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:f990c76a-a798-42bb-852f-5be5006f8026"
           resource_class: large
       - pytorch_linux_bazel_test:
           name: pytorch_bazel_test
@@ -3010,7 +2916,7 @@ workflows:
             - setup
             - pytorch_bazel_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-bazel-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:f990c76a-a798-42bb-852f-5be5006f8026"
       - caffe2_linux_build:
           name: caffe2_onnx_main_py3_6_clang7_ubuntu16_04_build
           requires:
@@ -5037,8 +4943,7 @@ workflows:
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_32"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -5047,8 +4952,7 @@ workflows:
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_64"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -5057,8 +4961,7 @@ workflows:
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v7a"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -5067,8 +4970,7 @@ workflows:
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v8a"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -7085,54 +6987,63 @@ workflows:
             branches:
               only: postnightly
 
-      # - docker_for_ecr_gc_build_job
+  docker_build:
+    triggers:
+      - schedule:
+          cron: "0 15 * * 0"
+          filters:
+            branches:
+              only:
+                - master
+    jobs:
+      - docker_for_ecr_gc_build_job
       - docker_build_job:
-          name: "docker-pytorch-linux-bionic-py3.6-clang9"
+          name: "pytorch-linux-bionic-py3.6-clang9"
           image_name: "pytorch-linux-bionic-py3.6-clang9"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9-cudnn7-py3"
+          name: "pytorch-linux-xenial-cuda9-cudnn7-py3"
           image_name: "pytorch-linux-xenial-cuda9-cudnn7-py3"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
+          name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
           image_name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          name: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           image_name: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3-clang5-asan"
+          name: "pytorch-linux-xenial-py3-clang5-asan"
           image_name: "pytorch-linux-xenial-py3-clang5-asan"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.8"
+          name: "pytorch-linux-xenial-py3.8"
           image_name: "pytorch-linux-xenial-py3.8"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-clang7"
+          name: "pytorch-linux-xenial-py3.6-clang7"
           image_name: "pytorch-linux-xenial-py3.6-clang7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc4.8"
+          name: "pytorch-linux-xenial-py3.6-gcc4.8"
           image_name: "pytorch-linux-xenial-py3.6-gcc4.8"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc5.4"
+          name: "pytorch-linux-xenial-py3.6-gcc5.4"
           image_name: "pytorch-linux-xenial-py3.6-gcc5.4"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc7.2"
+          name: "pytorch-linux-xenial-py3.6-gcc7.2"
           image_name: "pytorch-linux-xenial-py3.6-gcc7.2"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc7"
+          name: "pytorch-linux-xenial-py3.6-gcc7"
           image_name: "pytorch-linux-xenial-py3.6-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-pynightly"
+          name: "pytorch-linux-xenial-pynightly"
           image_name: "pytorch-linux-xenial-pynightly"
   ecr_gc:
     triggers:
diff --git a/.circleci/docker/build.sh b/.circleci/docker/build.sh
index d6fddfab753..6dc249f8937 100755
--- a/.circleci/docker/build.sh
+++ b/.circleci/docker/build.sh
@@ -188,7 +188,6 @@ tmp_tag="tmp-$(cat /dev/urandom | tr -dc 'a-z' | fold -w 32 | head -n 1)"
 # it's no longer needed.
 docker build \
        --no-cache \
-       --progress=plain \
        --build-arg "TRAVIS_DL_URL_PREFIX=${TRAVIS_DL_URL_PREFIX}" \
        --build-arg "BUILD_ENVIRONMENT=${image}" \
        --build-arg "PROTOBUF=${PROTOBUF:-}" \
diff --git a/.circleci/docker/build_docker.sh b/.circleci/docker/build_docker.sh
index 1e8695017dc..eeb4e70a09b 100755
--- a/.circleci/docker/build_docker.sh
+++ b/.circleci/docker/build_docker.sh
@@ -6,8 +6,14 @@ retry () {
     $*  || (sleep 1 && $*) || (sleep 2 && $*)
 }
 
-# Setup from previous step, typically located in .circleci/artifacts/env_file
-tag="${DOCKER_TAG}"
+# If UPSTREAM_BUILD_ID is set (see trigger job), then we can
+# use it to tag this build with the same ID used to tag all other
+# base image builds. Also, we can try and pull the previous
+# image first, to avoid rebuilding layers that haven't changed.
+
+#until we find a way to reliably reuse previous build, this last_tag is not in use
+# last_tag="$(( CIRCLE_BUILD_NUM - 1 ))"
+tag="${CIRCLE_WORKFLOW_ID}"
 
 
 registry="308535385114.dkr.ecr.us-east-1.amazonaws.com"
diff --git a/.circleci/validate-docker-version.py b/.circleci/validate-docker-version.py
new file mode 100755
index 00000000000..9410b885680
--- /dev/null
+++ b/.circleci/validate-docker-version.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+import cimodel.data.caffe2_build_definitions as caffe2_build_definitions
+import cimodel.data.pytorch_build_definitions as pytorch_build_definitions
+from yaml import load
+
+try:
+    from yaml import CLoader as Loader
+except ImportError:
+    from yaml import Loader
+
+
+def load_config(filename=".circleci/config.yml"):
+    with open(filename, "r") as fh:
+        return load("".join(fh.readlines()), Loader)
+
+
+def load_tags_for_projects(workflow_config):
+    return {
+        v["ecr_gc_job"]["project"]: v["ecr_gc_job"]["tags_to_keep"]
+        for v in workflow_config["workflows"]["ecr_gc"]["jobs"]
+        if isinstance(v, dict) and "ecr_gc_job" in v
+    }
+
+
+def check_version(job, tags, expected_version):
+    valid_versions = tags[job].split(",")
+    if expected_version not in valid_versions:
+        raise RuntimeError(
+            "We configured {} to use Docker version {}; but this "
+            "version is not configured in job ecr_gc_job_for_{}.  Non-deployed versions will be "
+            "garbage collected two weeks after they are created.  DO NOT LAND "
+            "THIS TO MASTER without also updating ossci-job-dsl with this version."
+            "\n\nDeployed versions: {}".format(job, expected_version, job, tags[job])
+        )
+
+
+def validate_docker_version():
+    tags = load_tags_for_projects(load_config())
+    check_version("pytorch", tags, pytorch_build_definitions.DOCKER_IMAGE_VERSION)
+    check_version("caffe2", tags, caffe2_build_definitions.DOCKER_IMAGE_VERSION)
+
+
+if __name__ == "__main__":
+    validate_docker_version()
diff --git a/.circleci/verbatim-sources/commands.yml b/.circleci/verbatim-sources/commands.yml
index 683a0b71dcc..a4ec6d8f41f 100644
--- a/.circleci/verbatim-sources/commands.yml
+++ b/.circleci/verbatim-sources/commands.yml
@@ -10,21 +10,6 @@ commands:
           name: Attaching workspace
           at: ~/workspace
 
-  # Must be run after attaching workspace from previous steps
-  load_shared_env:
-    description: "Loads .circleci/shared/env_file into ${BASH_ENV}"
-    parameters:
-      # For some weird reason we decide to reattach our workspace to ~/workspace so
-      # in the vein of making it simple let's assume our share env_file is here
-      root:
-        type: string
-        default: "~/workspace"
-    steps:
-      - run:
-          name: "Load .circleci/shared/env_file into ${BASH_ENV}"
-          command: |
-            cat << parameters.root >>/.circleci/shared/env_file >> ${BASH_ENV}
-
   # This system setup script is meant to run before the CI-related scripts, e.g.,
   # installing Git client, checking out code, setting up CI env, and
   # building/testing.
diff --git a/.circleci/verbatim-sources/docker_jobs.yml b/.circleci/verbatim-sources/docker_jobs.yml
index e04d11c5cdb..6ce3440bbf9 100644
--- a/.circleci/verbatim-sources/docker_jobs.yml
+++ b/.circleci/verbatim-sources/docker_jobs.yml
@@ -8,45 +8,8 @@
       resource_class: large
       environment:
         IMAGE_NAME: << parameters.image_name >>
-        # Enable 'docker manifest'
-        DOCKER_CLI_EXPERIMENTAL: "enabled"
-        DOCKER_BUILDKIT: 1
       steps:
         - checkout
-        - run:
-            name: Calculate docker tag
-            command: |
-              set -x
-              mkdir .circleci/shared
-              # git keeps a hash of all sub trees
-              echo "export DOCKER_TAG=$(git rev-parse HEAD:.circleci/docker)" >> .circleci/shared/env_file
-        # Saves our calculated docker tag to our workpace for later use
-        - persist_to_workspace:
-            root: .
-            paths:
-              - .circleci/shared/
-        - load_shared_env:
-            root: .
-        - run:
-            name: Check if image should be built
-            command: |
-              set +x
-              export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
-              export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
-              eval $(aws ecr get-login --no-include-email --region us-east-1)
-              set -x
-              # Check if image already exists, if it does then skip building it
-              if docker manifest inspect "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/${IMAGE_NAME}:${DOCKER_TAG}"; then
-                circleci-agent step halt
-              fi
-              PREVIOUS_DOCKER_TAG=$(git rev-parse "$(git merge-base HEAD << pipeline.git.base_revision >>):.circleci/docker")
-              # If no image exists but the hash is the same as the previous hash then we should error out here
-              # no stampeding herd effect plz.
-              if [[ ${PREVIOUS_DOCKER_TAG} = ${DOCKER_TAG} ]]; then
-                echo "ERROR: Something has gone wrong and the previous image isn't available for the merge-base of your branch"
-                echo "       contact the PyTorch team to restore the original images"
-                exit 1
-              fi
         - run:
             name: build_docker_image_<< parameters.image_name >>
             no_output_timeout: "1h"
@@ -55,9 +18,7 @@
               export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
               export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
               set -x
-              source .circleci/shared/env_file
               cd .circleci/docker && ./build_docker.sh
-
   docker_for_ecr_gc_build_job:
       machine:
         image: ubuntu-1604:201903-01
@@ -84,25 +45,14 @@
           type: string
       environment:
         PROJECT: << parameters.project >>
-        # TODO: Remove legacy image tags once we feel comfortable with new docker image tags
         IMAGE_TAG: << parameters.tags_to_keep >>
       docker:
         - image: 308535385114.dkr.ecr.us-east-1.amazonaws.com/gc/ecr
           aws_auth:
             aws_access_key_id: ${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
             aws_secret_access_key: ${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
+
       steps:
-        - checkout
-        - run:
-            # NOTE: see 'docker_build_job' for how these tags actually get built
-            name: dynamically generate tags to keep
-            no_output_timeout: "1h"
-            command: |
-              GENERATED_IMAGE_TAG=$(\
-                git log --oneline --pretty='%H' .circleci/docker \
-                  | xargs -I '{}' git rev-parse '{}:.circleci/docker' \
-                  | paste -sd "," -)
-              echo "export GENERATED_IMAGE_TAG='${GENERATED_IMAGE_TAG}'" >> ${BASH_ENV}
         - run:
             name: garbage collecting for ecr images
             no_output_timeout: "1h"
@@ -111,7 +61,7 @@
               export AWS_ACCESS_KEY_ID=${CIRCLECI_AWS_ACCESS_KEY_FOR_DOCKER_BUILDER_V1}
               export AWS_SECRET_ACCESS_KEY=${CIRCLECI_AWS_SECRET_KEY_FOR_DOCKER_BUILDER_V1}
               set -x
-              /usr/bin/gc.py --filter-prefix ${PROJECT}  --ignore-tags "${IMAGE_TAG},${GENERATED_IMAGE_TAG}"
+              /usr/bin/gc.py --filter-prefix ${PROJECT}  --ignore-tags ${IMAGE_TAG}
 
   docker_hub_index_job:
       docker:
diff --git a/.circleci/verbatim-sources/job-specs-custom.yml b/.circleci/verbatim-sources/job-specs-custom.yml
index 6f73b5b9e59..aa22f223790 100644
--- a/.circleci/verbatim-sources/job-specs-custom.yml
+++ b/.circleci/verbatim-sources/job-specs-custom.yml
@@ -2,14 +2,13 @@
     environment:
       BUILD_ENVIRONMENT: pytorch-python-doc-push
       # TODO: stop hardcoding this
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -17,7 +16,7 @@
         no_output_timeout: "1h"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
@@ -54,14 +53,13 @@
   pytorch_cpp_doc_push:
     environment:
       BUILD_ENVIRONMENT: pytorch-cpp-doc-push
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -69,7 +67,7 @@
         no_output_timeout: "1h"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
@@ -165,7 +163,7 @@
   pytorch_android_gradle_build:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-build
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
@@ -180,7 +178,7 @@
         no_output_timeout: "1h"
         command: |
           set -eux
-          docker_image_commit=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          docker_image_commit=${DOCKER_IMAGE}-${CIRCLE_SHA1}
 
           docker_image_libtorch_android_x86_32=${docker_image_commit}-android-x86_32
           docker_image_libtorch_android_x86_64=${docker_image_commit}-android-x86_64
@@ -251,14 +249,13 @@
   pytorch_android_publish_snapshot:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-publish-snapshot
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - setup_ci_environment
@@ -267,7 +264,7 @@
         no_output_timeout: "1h"
         command: |
           set -eux
-          docker_image_commit=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          docker_image_commit=${DOCKER_IMAGE}-${CIRCLE_SHA1}
 
           docker_image_libtorch_android_x86_32_gradle=${docker_image_commit}-android-x86_32-gradle
 
@@ -288,14 +285,13 @@
   pytorch_android_gradle_build-x86_32:
     environment:
       BUILD_ENVIRONMENT: pytorch-linux-xenial-py3-clang5-android-ndk-r19c-gradle-build-only-x86_32
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       PYTHON_VERSION: "3.6"
     resource_class: large
     machine:
       image: ubuntu-1604:201903-01
     steps:
     - attach_scripts
-    - load_shared_env
     - run:
         name: filter out not PR runs
         no_output_timeout: "5m"
@@ -312,7 +308,7 @@
         no_output_timeout: "1h"
         command: |
           set -e
-          docker_image_libtorch_android_x86_32=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}-android-x86_32
+          docker_image_libtorch_android_x86_32=${DOCKER_IMAGE}-${CIRCLE_SHA1}-android-x86_32
           echo "docker_image_libtorch_android_x86_32: "${docker_image_libtorch_android_x86_32}
 
           # x86
@@ -457,7 +453,6 @@
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - setup_ci_environment
@@ -467,9 +462,9 @@
         command: |
           set -e
           # Pull Docker image and run build
-          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}:${DOCKER_TAG}
-          time docker pull ${DOCKER_IMAGE}:${DOCKER_TAG} >/dev/null
-          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE}:${DOCKER_TAG})
+          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}
+          time docker pull ${DOCKER_IMAGE} >/dev/null
+          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE})
 
           echo "Do NOT merge master branch into $CIRCLE_BRANCH in environment $BUILD_ENVIRONMENT"
 
@@ -484,7 +479,7 @@
           # Push intermediate Docker image for next phase to use
           if [ -z "${BUILD_ONLY}" ]; then
             # Augment our output image name with bazel to avoid collisions
-            output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-bazel-${CIRCLE_SHA1}
+            output_image=${DOCKER_IMAGE}-bazel-${CIRCLE_SHA1}
             export COMMIT_DOCKER_IMAGE=$output_image
             docker commit "$id" ${COMMIT_DOCKER_IMAGE}
             time docker push ${COMMIT_DOCKER_IMAGE}
@@ -497,7 +492,6 @@
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -505,7 +499,7 @@
         no_output_timeout: "90m"
         command: |
           set -e
-          output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-bazel-${CIRCLE_SHA1}
+          output_image=${DOCKER_IMAGE}-bazel-${CIRCLE_SHA1}
           export COMMIT_DOCKER_IMAGE=$output_image
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
 
@@ -538,14 +532,14 @@
   pytorch_doc_test:
     environment:
       BUILD_ENVIRONMENT: pytorch-doc-test
-      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+      # TODO: stop hardcoding this
+      DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
     resource_class: medium
     machine:
       image: ubuntu-1604:201903-01
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -553,7 +547,7 @@
         no_output_timeout: "30m"
         command: |
           set -ex
-          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          export COMMIT_DOCKER_IMAGE=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           echo "DOCKER_IMAGE: "${COMMIT_DOCKER_IMAGE}
           time docker pull ${COMMIT_DOCKER_IMAGE} >/dev/null
           export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${COMMIT_DOCKER_IMAGE})
diff --git a/.circleci/verbatim-sources/pytorch-job-specs.yml b/.circleci/verbatim-sources/pytorch-job-specs.yml
index 2c417c1aff5..b2dd4ee6e38 100644
--- a/.circleci/verbatim-sources/pytorch-job-specs.yml
+++ b/.circleci/verbatim-sources/pytorch-job-specs.yml
@@ -6,7 +6,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - checkout
     - optional_merge_target_branch
@@ -17,9 +16,9 @@ jobs:
         command: |
           set -e
           # Pull Docker image and run build
-          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}:${DOCKER_TAG}
-          time docker pull ${DOCKER_IMAGE}:${DOCKER_TAG} >/dev/null
-          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE}:${DOCKER_TAG})
+          echo "DOCKER_IMAGE: "${DOCKER_IMAGE}
+          time docker pull ${DOCKER_IMAGE} >/dev/null
+          export id=$(docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -t -d -w /var/lib/jenkins ${DOCKER_IMAGE})
 
           git submodule sync && git submodule update -q --init --recursive
 
@@ -42,7 +41,7 @@ jobs:
             # The xla build uses the same docker image as
             # pytorch-linux-trusty-py3.6-gcc5.4-build. In the push step, we have to
             # distinguish between them so the test can pick up the correct image.
-            output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+            output_image=${DOCKER_IMAGE}-${CIRCLE_SHA1}
             if [[ ${BUILD_ENVIRONMENT} == *"xla"* ]]; then
               export COMMIT_DOCKER_IMAGE=$output_image-xla
             elif [[ ${BUILD_ENVIRONMENT} == *"libtorch"* ]]; then
@@ -69,7 +68,6 @@ jobs:
     steps:
     # See Note [Workspace for CircleCI scripts] in job-specs-setup.yml
     - attach_scripts
-    - load_shared_env
     - setup_linux_system_environment
     - setup_ci_environment
     - run:
@@ -78,7 +76,7 @@ jobs:
         command: |
           set -e
           # See Note [Special build images]
-          output_image=${DOCKER_IMAGE}:${DOCKER_TAG}-${CIRCLE_SHA1}
+          output_image=${DOCKER_IMAGE}-${CIRCLE_SHA1}
           if [[ ${BUILD_ENVIRONMENT} == *"xla"* ]]; then
             export COMMIT_DOCKER_IMAGE=$output_image-xla
           elif [[ ${BUILD_ENVIRONMENT} == *"libtorch"* ]]; then
diff --git a/.circleci/verbatim-sources/workflows-docker-builder.yml b/.circleci/verbatim-sources/workflows-docker-builder.yml
index db6205c0ef5..3ef03d53265 100644
--- a/.circleci/verbatim-sources/workflows-docker-builder.yml
+++ b/.circleci/verbatim-sources/workflows-docker-builder.yml
@@ -1,49 +1,58 @@
-      # - docker_for_ecr_gc_build_job
+  docker_build:
+    triggers:
+      - schedule:
+          cron: "0 15 * * 0"
+          filters:
+            branches:
+              only:
+                - master
+    jobs:
+      - docker_for_ecr_gc_build_job
       - docker_build_job:
-          name: "docker-pytorch-linux-bionic-py3.6-clang9"
+          name: "pytorch-linux-bionic-py3.6-clang9"
           image_name: "pytorch-linux-bionic-py3.6-clang9"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10.1-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9-cudnn7-py3"
+          name: "pytorch-linux-xenial-cuda9-cudnn7-py3"
           image_name: "pytorch-linux-xenial-cuda9-cudnn7-py3"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
+          name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
           image_name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc5.4"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
+          name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
           image_name: "pytorch-linux-xenial-cuda9.2-cudnn7-py3-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          name: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
           image_name: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3-clang5-asan"
+          name: "pytorch-linux-xenial-py3-clang5-asan"
           image_name: "pytorch-linux-xenial-py3-clang5-asan"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.8"
+          name: "pytorch-linux-xenial-py3.8"
           image_name: "pytorch-linux-xenial-py3.8"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-clang7"
+          name: "pytorch-linux-xenial-py3.6-clang7"
           image_name: "pytorch-linux-xenial-py3.6-clang7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc4.8"
+          name: "pytorch-linux-xenial-py3.6-gcc4.8"
           image_name: "pytorch-linux-xenial-py3.6-gcc4.8"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc5.4"
+          name: "pytorch-linux-xenial-py3.6-gcc5.4"
           image_name: "pytorch-linux-xenial-py3.6-gcc5.4"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc7.2"
+          name: "pytorch-linux-xenial-py3.6-gcc7.2"
           image_name: "pytorch-linux-xenial-py3.6-gcc7.2"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-py3.6-gcc7"
+          name: "pytorch-linux-xenial-py3.6-gcc7"
           image_name: "pytorch-linux-xenial-py3.6-gcc7"
       - docker_build_job:
-          name: "docker-pytorch-linux-xenial-pynightly"
+          name: "pytorch-linux-xenial-pynightly"
           image_name: "pytorch-linux-xenial-pynightly"
diff --git a/.circleci/verbatim-sources/workflows-nightly-android-binary-builds.yml b/.circleci/verbatim-sources/workflows-nightly-android-binary-builds.yml
index 2c0cb6d7e5c..3b92f53eed5 100644
--- a/.circleci/verbatim-sources/workflows-nightly-android-binary-builds.yml
+++ b/.circleci/verbatim-sources/workflows-nightly-android-binary-builds.yml
@@ -3,8 +3,7 @@
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_32"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -13,8 +12,7 @@
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-x86_64"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -23,8 +21,7 @@
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v7a"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
@@ -33,8 +30,7 @@
           build_environment: "pytorch-linux-xenial-py3-clang5-android-ndk-r19c-arm-v8a"
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           filters:
             branches:
               only: nightly
diff --git a/.circleci/verbatim-sources/workflows-pytorch-bazel-builds.yml b/.circleci/verbatim-sources/workflows-pytorch-bazel-builds.yml
index 1f6ed3e1017..825ea500ad1 100644
--- a/.circleci/verbatim-sources/workflows-pytorch-bazel-builds.yml
+++ b/.circleci/verbatim-sources/workflows-pytorch-bazel-builds.yml
@@ -2,9 +2,8 @@
           name: pytorch_bazel_build
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3.6-gcc7
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-bazel-build"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:f990c76a-a798-42bb-852f-5be5006f8026"
           resource_class: large
       - pytorch_linux_bazel_test:
           name: pytorch_bazel_test
@@ -12,4 +11,4 @@
             - setup
             - pytorch_bazel_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc7-bazel-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc7:f990c76a-a798-42bb-852f-5be5006f8026"
diff --git a/.circleci/verbatim-sources/workflows-pytorch-ge-config-tests.yml b/.circleci/verbatim-sources/workflows-pytorch-ge-config-tests.yml
index 767e201e0d4..58004904a3f 100644
--- a/.circleci/verbatim-sources/workflows-pytorch-ge-config-tests.yml
+++ b/.circleci/verbatim-sources/workflows-pytorch-ge-config-tests.yml
@@ -4,7 +4,7 @@
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-ge_config_legacy-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_test:
           name: pytorch_linux_xenial_py3_6_gcc5_4_ge_config_profiling_test
@@ -12,7 +12,7 @@
             - setup
             - pytorch_linux_xenial_py3_6_gcc5_4_build
           build_environment: "pytorch-linux-xenial-py3.6-gcc5.4-ge_config_profiling-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3.6-gcc5.4:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           resource_class: large
       - pytorch_linux_test:
           name: pytorch_linux_xenial_cuda10_2_cudnn7_py3_ge_config_legacy_test
@@ -20,7 +20,7 @@
             - setup
             - pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-ge_config_legacy-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
       - pytorch_linux_test:
@@ -29,6 +29,6 @@
             - setup
             - pytorch_linux_xenial_cuda10_2_cudnn7_py3_gcc7_build
           build_environment: "pytorch-linux-xenial-cuda10.1-cudnn7-ge_config_profiling-test"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-cuda10.2-cudnn7-py3-gcc7:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
           use_cuda_docker_runtime: "1"
           resource_class: gpu.medium
diff --git a/.circleci/verbatim-sources/workflows-pytorch-mobile-builds.yml b/.circleci/verbatim-sources/workflows-pytorch-mobile-builds.yml
index 6afa28cc744..2a91b464526 100644
--- a/.circleci/verbatim-sources/workflows-pytorch-mobile-builds.yml
+++ b/.circleci/verbatim-sources/workflows-pytorch-mobile-builds.yml
@@ -3,32 +3,28 @@
           name: pytorch_linux_xenial_py3_clang5_mobile_build
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-asan
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-build"
           build_only: "1"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_custom_build_static
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-asan
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-custom-build-static"
           build_only: "1"
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-asan:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_custom_build_dynamic
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-custom-build-dynamic"
           build_only: "1"
           # Use LLVM-DEV toolchain in android-ndk-r19c docker image
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
       - pytorch_linux_build:
           name: pytorch_linux_xenial_py3_clang5_mobile_code_analysis
           requires:
             - setup
-            - docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c
           # Most of this CI is already covered by "mobile-custom-build-dynamic" job
           filters:
             branches:
@@ -39,4 +35,4 @@
           build_environment: "pytorch-linux-xenial-py3-clang5-mobile-code-analysis"
           build_only: "1"
           # Use LLVM-DEV toolchain in android-ndk-r19c docker image
-          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c"
+          docker_image: "308535385114.dkr.ecr.us-east-1.amazonaws.com/pytorch/pytorch-linux-xenial-py3-clang5-android-ndk-r19c:9a3986fa-7ce7-4a36-a001-3c9bef9892e2"
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 9e546e77e66..f34efcb9716 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -21,6 +21,10 @@ jobs:
         run: |
           pip install -r requirements.txt
           cd .circleci && ./ensure-consistency.py
+      - name: Ensure Docker version is correctly deployed
+        run: |
+          pip install pyyaml
+          .circleci/validate-docker-version.py
       - name: Shellcheck Jenkins scripts
         run: |
           sudo apt-get install -y shellcheck