---
title: Share the application
weight: 40
linkTitle: "Part 3: Share the application"
keywords: get started, setup, orientation, quickstart, intro, concepts, containers,
  docker desktop, docker hub, sharing
description: Sharing your image you built for your example application so you can
  run it else where and other developers can use it
aliases:
 - /get-started/part3/
 - /get-started/04_sharing_app/
 - /guides/workshop/04_sharing_app/
---

Now that you've built an image, you can share it. To share Docker images, you have to use a Docker
registry. The default registry is Docker Hub and is where all of the images you've used have come from.

> **Docker ID**
>
> A Docker ID lets you access Docker Hub, which is the world's largest library and community for container images. Create a [Docker ID](https://hub.docker.com/signup) for free if you don't have one.

## Create a repository

To push an image, you first need to create a repository on Docker Hub.

1. [Sign up](https://www.docker.com/pricing?ref=Docs&refAction=DocsSharingApp) or Sign in to [Docker Hub](https://hub.docker.com).

2. Select the **Create Repository** button.

3. For the repository name, use `getting-started`. Make sure the **Visibility** is **Public**.

4. Select **Create**.

In the following image, you can see an example Docker command from Docker Hub. This command will push to this repository.

![Docker command with push example](images/push-command.webp)


## Push the image

Let's try to push the image to Docker Hub.

1. In the command line, run the following command:

   ```console
   docker push docker/getting-started
   ```

   You'll see an error like this:

   ```console
   $ docker push docker/getting-started
   The push refers to repository [docker.io/docker/getting-started]
   An image does not exist locally with the tag: docker/getting-started
   ```

   This failure is expected because the image isn't tagged correctly yet.
   Docker is looking for an image name `docker/getting-started`, but your
   local image is still named `getting-started`.

   You can confirm this by running:

   ```console
   docker image ls
   ```

2. To fix this, first sign in to Docker Hub using your Docker ID: `docker login YOUR-USER-NAME`.
3. Use the `docker tag` command to give the `getting-started` image a new name. Replace `YOUR-USER-NAME` with your Docker ID.

   ```console
   $ docker tag getting-started YOUR-USER-NAME/getting-started
   ```

4. Now run the `docker push` command again. If you're copying the value from
   Docker Hub, you can drop the `tagname` part, as you didn't add a tag to the
   image name. If you don't specify a tag, Docker uses a tag called `latest`.

   ```console
   $ docker push YOUR-USER-NAME/getting-started
   ```

## Run the image on a new instance

Now that your image has been built and pushed into a registry, you can run your app on any machine that has Docker installed. Try pulling and running your image on another computer or a cloud instance.

## Summary

In this section, you learned how to share your images by pushing them to a
registry. You then went to a brand new instance and were able to run the freshly
pushed image. This is quite common in CI pipelines, where the pipeline will
create the image and push it to a registry and then the production environment
can use the latest version of the image.

Related information:

 - [docker CLI reference](/reference/cli/docker/)
 - [Multi-platform images](/manuals/build/building/multi-platform.md)
 - [Docker Hub overview](/manuals/docker-hub/_index.md)

## Next steps

In the next section, you'll learn how to persist data in your containerized application.

{{< button text="Persist the DB" url="05_persisting_data.md" >}}