A brief analysis of the basic usage of Docker official images

Docker is a popular virtualization technology that can assist users to quickly build, publish and run applications. The Docker official image is a predefined environment provided by Docker, which can simplify the deployment process. But for some novice users, using Docker official images is not an easy task. This article will introduce you to the basic usage of Docker official images.

1. Introduction to Docker official image

Docker official image is a solidified but configurable Docker container environment, officially maintained by Docker. They are designed to be simple to use, rich in configuration, and can be used in a variety of scenarios. Docker official images include various operating systems and applications, such as Linux, Apache, Nginx, MySQL, Postgres, etc. Users can use these images directly or customize the images as needed.

On Docker Hub, you can find a complete list of official Docker images (https://hub.docker.com/u/library/). Every image has a name. For example, if you want to use the official image of Ubuntu 18.04, use the image name of ubuntu:18.04.

2. Use Docker official image

2.1 Download the image on Docker Hub

To obtain the Docker official image, you need to install Docker first. If you have Docker installed, just enter the following command in the terminal window to download the corresponding image:

docker pull 镜像名

For example, the following command will download the official Nginx image:

docker pull nginx

2.2 Run the official Docker image

After downloading, you can use the docker run command to start the official Docker image. For example, if you need to start the image you just downloaded:

docker run -it --rm nginx bash

This will open a bash session , you can execute various commands in that session (for example, run an Nginx server).

2.3 Push a customized Docker official image

If you want to push your own Docker official image, you need to upload it to Docker Hub. To upload the Docker official image, you can perform the following steps:

1. Create your own image. For example, the following command will generate an Nginx image named mynginx locally.

docker build -t mynginx .

2. Upload the image to Docker Hub.

docker push myusername/mynginx

This will upload the image to Docker Hub. If you have not used Docker Hub, please register for an account through the registration page. Push focuses on creating a Docker image registry, for which you need to set a name.

3. Summary

Through this article, we introduced Docker official images and explained their basic usage. We have explained how to download and run Docker official images and push customized Docker official images one by one. Docker Hub's official images provide users with a reliable, standardized environment that accelerates software delivery and application deployment. If you are thinking about using Docker to simplify application deployment, using the official Docker image would be a great starting point!

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