How to use Docker containers in Linux systems

With the popularity of microservice architecture, Docker containers are becoming more and more popular. It allows developers to build and run applications on different platforms and environments, improving the portability and scalability of applications. This article will introduce how to use Docker containers in Linux systems.

1. Installing Docker

Installing Docker on a Linux system is very simple. You can download the Docker installation package from the Docker official website, or you can install it using the system's default package manager.

For Ubuntu system, you can use the following command to install:

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

For CentOS system, you can use the following command to install:

sudo yum update
sudo yum install docker

After successful installation, you can use the following command to check Docker Whether it is installed correctly:

docker --version

2. Start the Docker service

After the installation is complete, you need to start the Docker service. You can use the following command:

sudo service docker start

You can also use the following command to enable auto-start:

sudo systemctl enable docker.service

3. Pull the Docker image

The Docker image is a pre-configured application environment. Docker users can pull already built images and run them locally or online.

You can pull the Docker image through the following command:

docker pull image-name

"image-name" is the name of the image that needs to be pulled. For example, if you want to pull the latest version of Ubuntu, you can use the following command:

docker pull ubuntu:latest

You can find and download other images on Docker Hub.

4. Run the Docker container

Once the Docker image is pulled, you can run the Docker container. You can use the following command:

docker run image-name

"image-name" is the name of the image that needs to be run.

For example, to run an interactive terminal in Ubuntu, you can use the following command:

docker run -it ubuntu /bin/bash

This will launch an interactive Ubuntu terminal. After running the command, you can use the exit command to exit the terminal.

5. Background services for running Docker containers

There are many services that need to run in the background. In Docker, you can run a daemon using the following command:

docker run -d image-name command

"command" is the command that needs to be run. For example, to run an Apache web server in the background, you can use the following command:

docker run -d -p 80:80 httpd

This will start an Apache web server, listen on local port 80, and run in the background.

6. View running Docker containers

You can use the following command to view the currently running Docker containers:

docker ps

This will list all running Docker container details.

7. Stop the Docker container

To stop the Docker container, you can use the following command:

docker stop container-id

"container-id" is the ID of the container that needs to be stopped. . You can use the "docker ps" command to find the container's ID.

8. Delete Docker container

To delete a Docker container, you can use the following command:

docker rm container-id

"container-id" is the ID of the container that needs to be deleted . You can use the "docker ps -a" command to find the ID of the container.

Summary

Docker container is a popular microservice architecture that can build and run applications on different platforms and environments. In Linux systems, Docker containers can be installed and used using simple commands. We covered how to pull and run Docker images, run background services, and view and stop Docker containers. Hope this article helps you!

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