What is docker hub used for?

Docker hub is a public registry maintained by Docker. It contains more than 15,000 images that can be used to download and build containers, and also provides certification, workgroup structure, workflow tools, and build triggers. and private tools.

The operating environment of this article: ubuntu 18.04 system, Docker version 20.10.11, Dell G3 computer.

What is docker hub used for?

Docker Hub is a public registry maintained by the Docker Company. It contains more than 15,000 images that can be used to download and build containers, and also provides certification, workgroup structure, and workflow tools. (such as webhooks), build triggers, and private tools (such as private repositories for storing images you don’t want to share publicly).

Docker Hub Features

Let’s take a closer look at the features of Docker Hub, here you can see more information.

• Private warehouse

• Organization and team

• Automatic build

• Webhooks

Private repository

Sometimes you don’t want to make your image public or share it, so Docker Hub allows you to have a private repository repository, you can log in here to set it up.

Organizations and Institutions

One of the more useful aspects of private repositories is that you can share the repository with your team or your organization. Docker Hub supports creating organizations so that you and your colleagues can manage your private repositories. Here you can learn how to create and manage an organization.

Automatic build

The automatic build function will automatically build or update the image directly from Github and BitBucket to Docker Hub by adding a commit to the Github or Bitbucket repository. Hook is implemented, and when you push a submission, the build and update will be triggered.

To set up an automated build you need:

1. Create a Docker Hub account and log in

2. Connect your GitHub or BitBucket through the Link Accounts menu

3. Configure automated build

4. Select a Github or BitBucket project that contains a Dockerfile

5. Select the branch you want to use for building (the default is the master branch)

6. Create a name for the automatic build

7. Specify a Docker label to build

8. Specify the path of the Dockerfile, the default is /.

Once the automatic build is configured, the build will be automatically triggered within a few minutes, and you will see your new build in the Docker Hub repository source, and it will be updated in sync with your Github or BitBucket Until you disable automatic builds.

If you want to see the status of your automated build, you can go to your Docker Hub automated build page and it will show you the status and build history of your build.

Once you create an automated build, you can disable or delete it. However, you cannot push an automated build through docker push, but can only manage it by submitting your code on Github or BitBucket.

You can create multiple automated builds in a repository, configuring them to specify only the Dockerfile or Git branch.

Build Trigger

Automatic builds can also be triggered through Docker Hub URLs, so you can automatically build images through command reconstruction.

Webhooks

Webhooks are part of your repository and allow you to trigger an event when an image is updated or pushed to your repository. When your image is pushed, the webhook can be delivered based on the URL you specified and a valid Json.

Recommended learning: "Docker Video Tutorial"

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