2.5. Uploading container images to a mirror registry

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 variables pointing to the pull secret file:

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

3. Set the environment variables pointing to the local container image directory:

   $ IMAGE_LOCAL_DIR=~/microshift-containers

4. Set the environment variables pointing to the mirror registry URL for uploading the container images:

   $ TARGET_REGISTRY=<registry_host>:<port> 

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   Replace <registry_host>:<port> with the host name and port of your mirror registry server.

5. Run the following script to upload the container images to the ${TARGET_REGISTRY} mirror registry:

   pushd "${IMAGE_LOCAL_DIR}" >/dev/null
   while read -r src_manifest ; do
     local src_img
     src_img=$(dirname "${src_manifest}")
     # Add the target registry prefix and remove SHA
     local -r dst_img="${TARGET_REGISTRY}/${src_img}"
     local -r dst_img_no_tag="${TARGET_REGISTRY}/${src_img%%[@:]*}"
     # Run the image upload
     echo "Uploading '${src_img}' to '${dst_img}'"
     skopeo copy --all --quiet \
        --preserve-digests \
        --authfile "${IMAGE_PULL_FILE}" \
        dir://"${IMAGE_LOCAL_DIR}/${src_img}" docker://"${dst_img}"
   done < <(find . -type f -name manifest.json -printf '%P\n')
   popd >/dev/null