4.4. Downloading container images

Procedure

1. Install the skopeo tool used for copying the container images by running the following command:

   $ sudo dnf install -y skopeo

2. Set the environment variable that points to the pull secret file:

   $ PULL_SECRET_FILE=~/.pull-secret-mirror.json

3. Set the environment variable that points to the list of container images:

   $ IMAGE_LIST_FILE=~/microshift-container-refs.txt

4. Set the environment variable that points to the destination directory for storing the downloaded data:

   $ IMAGE_LOCAL_DIR=~/microshift-containers

5. Run the following script to download the container images to the ${IMAGE_LOCAL_DIR} directory:

   while read -r src_img ; do
      # Remove the source registry prefix
      dst_img=$(echo "${src_img}" | cut -d '/' -f 2-)
   
      # Run the image download command
      echo "Downloading '${src_img}' to '${IMAGE_LOCAL_DIR}'"
      mkdir -p "${IMAGE_LOCAL_DIR}/${dst_img}"
      skopeo copy --all --quiet \
         --preserve-digests \
         --authfile "${PULL_SECRET_FILE}" \
         docker://"${src_img}" dir://"${IMAGE_LOCAL_DIR}/${dst_img}"
   
   done < "${IMAGE_LIST_FILE}"