How to enter the world of Docker

With the gradual development of cloud computing and container technology, Docker has become a very popular container technology that can effectively manage, deploy, and quickly start applications. In this article, we will introduce how to enter the world of Docker.

What is Docker?

Docker is a virtualization technology that can isolate applications by creating lightweight containers so that they can run balancedly between different environments. In Docker, each container can host an independent application and have its own dependency environment and file system. This way, developers can easily deploy applications on any operating system that supports Docker without having to worry about applications interfering with each other.

How to install Docker?

First, you need to install Docker Engine. Docker Engine is the core of Docker and is used to create and run containers.

On Linux, you can use the following command to install:

sudo apt-get update
sudo apt-get install docker-ce

On Mac, you can download Docker Desktop from the official Docker website and follow the installation guide to install it.

On Windows, you can also download Docker Desktop from the official Docker website and install it according to the installation guide.

How to enter Docker?

Once your Docker Engine is successfully installed, you can start using Docker. Below are some useful commands to help you navigate in Docker.

Running a Docker Container

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

docker run [image name]

For example:

docker run hello-world

This command will run a container from Docker Hub downloads and runs the image named "hello-world". If all goes well, you will see a simple welcome message.

View running containers

To view running containers, you can use the following command:

docker ps

This command will list all running containers, and their Details such as ID, name, status and port.

View all containers

To view all containers (including stopped containers), you can use the following command:

docker ps -a

This command will list all containers, regardless of whether they are running.

Enter the container command line

To enter the command line of a running container, you can use the following command:

docker exec -it [container ID] bash

For example:

docker exec -it 1234abcde567 bash

This command Will enter the container with the container ID "1234abcde567" and open a bash shell.

Stop the container

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

docker stop [container ID]

For example:

docker stop 1234abcde567

This command will stop the container with the ID "1234abcde567" container.

Delete container

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

docker rm [container ID]

For example:

docker rm 1234abcde567

This command will delete the container with the ID "1234abcde567" container.

Summary

Docker is a very popular container technology that can greatly simplify the deployment and management of applications. In this article, we have introduced the process of how to install Docker, run the container, view the container, enter the container command line, stop the container, and delete the container. I hope this article can help you gain an in-depth understanding of Docker and benefit from it.

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