Red Hat build of MicroShift

Upload container images to a mirror registry

To use your container images at an air-gapped site, upload them to the mirror registry by using the following procedure.

Prerequisites

You logged into a host with access to microshift-quay.
The .pull-secret-mirror.json file is available locally.
The microshift-containers directory contents are available locally.

Procedure

Install the skopeo tool used for copying the container images by running the following command:
```
$ sudo dnf install -y skopeo
```
Set the environment variables pointing to the pull secret file:
```
$ IMAGE_PULL_FILE=~/.pull-secret-mirror.json
```
Set the environment variables pointing to the local container image directory:
```
$ IMAGE_LOCAL_DIR=~/microshift-containers
```
Set the environment variables pointing to the mirror registry URL for uploading the container images:
```
$ TARGET_REGISTRY=<registry_host>:<port>
```
- Replace <registry_host>:<port> with the hostname and port of your mirror registry server.

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