How to obtain a Docker image (process)

Docker is a recently popular virtualization technology that can easily deploy, manage and run applications. Docker does this by packaging applications into containers and running them. When using Docker, a very important step is to obtain the required Docker image. This article will introduce you how to obtain a Docker image.

1. Register a Docker Hub account
   Docker Hub is a centralized Docker image warehouse. It is a public repository where users can upload and download Docker images. To download images from Docker Hub, you need to first register an account on the official website and log in. The registration process is very simple, you just need to fill in some basic information.
2. Search for images
   After logging in, you can find the image you need through Docker Hub. Docker Hub provides a search engine where you can enter relevant keywords to find the image you want. The search results will display a list of all eligible mirrors, as well as their names, descriptions, tags, downloads and other information.
3. Download Mirror
   When you find the mirror you want, you can click the mirror name and go to the mirror's details page. This page will provide details and tags for the image, as well as instructions on how to obtain the image. You can find Docker commands on this page that can be used to get, run, or upload the image.
4. Get the image
   You can obtain the Docker image in many ways, the most common way is to use the docker pull command. This command will download the selected image from Docker Hub and store it in your local image repository. You only need to run the following command:

docker pull image_name

where "image_name" is the name of the image you want to download.

5. Run the image
   Once you have successfully obtained the Docker image, you can run it at any time through the docker run command. Here is an example command to run a Docker image:

docker run image_name

This will start a new container and run the selected image within it. If you need to configure environment variables or map ports for your application, etc., you can configure the docker run command with additional command line options.

Summary
Docker image is one of the core components of the Docker ecosystem. In order to use Docker successfully, you need to know how to obtain the images you need. In this article, we introduce how to search and obtain open source images on Docker Hub. Finally, we showed you how to use the docker run command to run an image downloaded from Docker Hub.

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