Push all the images from a local registry to DockerHub in one go

The other day, I wanted to push all the images from my local Docker registry to the Docker Hub but I didn't want to do it manually so I wrote this bash shell script:

	#! /bin/bash
	#
	# This will push all the images from a local registry to DockerHub. For example:
	# local_registry_domain/branch/image_name:my-tag -> docker_hub_username/image_name:my-tag
	#
	dh_username=''
	dh_passwd=''
	local_repo=''
	local_branch=''
	local_repo_path="$local_repo/$local_branch/"
	local_tag=''
	docker login -u $dh_username -p $dh_passwd
	# list local images
	local_images=$(docker images "$local_repo_path*" --format "{{.Repository}}")
	for i in $local_images
	do
	img_name=${i//$local_repo_path/''}
	old_tag="$i:$local_tag"
	new_tag="$dh_username/$img_name:$local_tag"
	# tag the image to match dockerhub repo
	docker tag $old_tag $new_tag
	# push the image to docker
	docker push $new_tag
	done

view raw push_local_to_dockerhub.sh hosted with ❤ by GitHub

What the script's doing basically:

1. Get all the images in the local registry, assuming the image's name is in  this form: 

local.registry.domain/branch/image_name:my-tag

2. For each image, create a new tag that match DockerHub's requirement which is:

docker_hub_username/my-tag

3. Then push that image into Docker Hub

Here is my Docker Hub repositories after finish the PUSH, you can have a look:

https://hub.docker.com/u/dangtrinhnt/

Profit!