Query DockerHub for a list of all images and image tags associated with a user account, then pull all of them, tag them with a new registry, push them, and then delete them from the localhost.

dockerhub.sh

#!/bin/bash

# Example for the Docker Hub V2 API
# Returns all imagas and tags associated with a Docker Hub user account.
# Requires 'jq': https://stedolan.github.io/jq/

# set username and password
UNAME=""
UPASS=""
REGISTRY_URL="localhost:5000"

# -------

which jq > /dev/null
if [[ $? -ne 0 ]]; then
  echo "Install jq"
  exit 1
fi

which curl > /dev/null
if [[ $? -ne 0 ]]; then
  echo "Install curl"
  exit 1
fi

# -------

#set -e

# aquire token
getToken(){
  TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${UNAME}'", "password": "'${UPASS}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
}

# get list of repositories for the user account
getImageList() {
  REPO_LIST=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${UNAME}/?page_size=100 | jq -r '.results|.[]|.name')
}

# build a list of all images & tags
getTagList(){ # not needed because of --all-tags flag
  for i in ${REPO_LIST}; do
    # get tags for repo
    IMAGE_TAGS=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${UNAME}/${i}/tags/?page_size=100 | jq -r '.results|.[]|.name')

    # build a list of images from tags
    for j in ${IMAGE_TAGS}; do
      # add each tag to list
      FULL_IMAGE_LIST="${FULL_IMAGE_LIST} ${UNAME}/${i}:${j}"
    done
  done
}

batch() {
  ptr=0
  image_list_arr=($FULL_IMAGE_LIST)

  # pull 10 images at a time
  while [[ $ptr -lt ${#image_list_arr[@]} ]]; do
    for x in {0..9}; do
      docker pull ${image_list_arr[$ptr]} &
      pids[${x}]=$!
      ptr=$((ptr + 1))
    done
    for pid in ${pids[*]}; do
      wait $pid
    done
  done

  # tag 10 images at a time
  ptr=0
  while [[ $ptr -lt ${#image_list_arr[@]} ]]; do
    for x in {0..9}; do
      docker tag ${image_list_arr[$ptr]} ${REGISTRY_URL}/${image_list_arr[$ptr]} &
      pids[${x}]=$!
      ptr=$((ptr + 1))
    done
    for pid in ${pids[*]}; do
      wait $pid
    done
  done

  # push 10 new tags at a time
  ptr=0
  while [[ $ptr -lt ${#image_list_arr[@]} ]]; do
    for x in {0..9}; do
      docker push ${REGISTRY_URL}/${image_list_arr[$ptr]} &
      pids[${x}]=$!
      ptr=$((ptr + 1))
    done
    for pid in ${pids[*]}; do
      wait $pid
    done
  done

  # delete all images in list
  for i in ${FULL_IMAGE_LIST}; do
    docker rmi -f docker.io/${i}
    docker rmi -f ${REGISTRY_URL}/${i}
  done
}

stream() { # one image at a time
  for i in ${FULL_IMAGE_LIST}; do        # for each image in list
    docker pull ${i}                     # pull that image
    docker tag ${i} ${REGISTRY_URL}/${i} # tag that image
    docker push ${REGISTRY_URL}/${i}     # push new tag of that image
    docker rmi -f docker.io/${i}         # delete old tag of that image
    docker rmi -f ${REGISTRY_URL}/${i}   # delete new tag of that image
  done
}

main() {
  getToken
  getImageList
  echo "[========================]"
  echo "Batch or Stream migration?"
  echo "[========================]"
  read -p "Enter: " bs
  case $bs in
    [bB]* )
      getTagList
      batch;;
    [sS]* )
      getTagList
      stream;;
     * ) exit 1;;
  esac
}

main