How to download CentOS 7.3 image in Docker

Docker is a popular containerization technology that can quickly build, package and deploy applications. When using Docker, you often need to download different versions of the operating system as the base image of the container. This article will introduce how to download the CentOS 7.3 image in Docker.

CentOS is an open source operating system based on Red Hat Enterprise Linux and is widely used in enterprise servers and cloud computing environments. CentOS 7.3 is an important version of the CentOS 7.x series and contains many improvements and new features. You can easily create and manage your own CentOS containers by downloading and running CentOS 7.3 images in Docker.

The following are the specific steps to download the CentOS 7.3 image in Docker:

Step 1: Install Docker

First, make sure Docker is installed. The installation methods of Docker are different in different operating systems. In Ubuntu and Debian systems, you can use the following command to install Docker:

$ sudo apt-get update
$ sudo apt-get install docker.io

In CentOS and Fedora systems, you can use the following command to install Docker:

$ sudo yum update
$ sudo yum install docker

In Windows and Mac systems, you can Download the installation package and follow the prompts to install.

After the installation is complete, you can use the following command to check whether Docker has started correctly:

$ sudo systemctl status docker

Step 2: Search for the CentOS 7.3 image

Search for the CentOS 7.3 image in Docker, you can Use the following command:

$ sudo docker search centos:7.3

This command will list all available CentOS 7.3 images. Here, we choose the official CentOS 7.3 image. The name of the official image is "centos" and the label is "7.3.1611". In the next step, you will use this name and label to download the image.

Step 3: Download the CentOS 7.3 image

To download the CentOS 7.3 image, you can use the following command:

$ sudo docker pull centos:7.3.1611

This command will download the CentOS 7.3 image from Docker Hub. Depending on the network speed, the download may take anywhere from a few minutes to dozens of minutes.

Step 4: Run the CentOS 7.3 container

After the download is completed, you can run the CentOS 7.3 container. You can use the following command:

$ sudo docker run -it centos:7.3.1611 /bin/bash

This command will start a CentOS 7.3 container interactively and enter the bash shell. Any CentOS 7.3 supported commands and operations can be performed in this bash shell. For example, you can run the following command to view the CentOS 7.3 version:

$ cat /etc/centos-release

This command will output the version information of CentOS 7.3.

Step 5: Exit the container

When all operations are completed, you can use the following command to exit the container:

$ exit

This command will exit the container and return to the host's shell.

Summary:

This article briefly introduces how to download and run the CentOS 7.3 image in Docker. These steps also apply to downloading other versions of CentOS or images for other operating systems. Using Docker, you can quickly create and manage containers, becoming one of the essential tools for modern application development and deployment.

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