How to run docker image file

Docker is a containerization technology that packages an application and its dependencies into a container and then runs it anywhere. Whether in development, testing or production environments, Docker can easily deploy applications into containers.

Docker is an application based on client-server architecture, where the client and server can run on the same machine or on different machines. A container is a concept in Docker that is a packaging form of an application and its dependencies. The image in Docker is the template of the container. It is a read-only file that contains all dependencies, files, configurations, etc. required to run an application. When a container runs, Docker creates a writable file system layer associated with the image, then runs the container in this writable file system layer and isolates the container from the host environment.

So, how to run the image in Docker? Below we will introduce in detail how to run Docker images.

1. Get the image

Before running the image, you first need to obtain the image that needs to be run. Docker Hub is the most basic image warehouse in Docker, which contains a wealth of public images and official images. Images can be obtained through the Docker official website or the command line.

Command line:

$ docker pull 镜像名称

For example, if we want to obtain the hello-world image, we can execute the following command:

$ docker pull hello-world

2. Run the image

After obtaining the image, you can run the image. Docker provides the command docker run to run the image.

Command line:

$ docker run 镜像名称

For example, if we want to run the hello-world image, we can execute the following command:

$ docker run hello-world

After running the image, you will see the following information in the console ：

Hello from Docker!
This message shows that your installation appears to be working correctly.
...

3. View running containers

In Docker, you can use the docker ps command to view running containers.

Command line:

$ docker ps

If you want to view all running containers, you can use the docker ps -a command.

Command line:

$ docker ps -a

4. Enter the container

In Docker, you can use the docker exec command to enter the container.

Command line:

$ docker exec -it 容器ID bash

For example, if we want to enter the container with ID f2a55167c8e4, we can execute the following command:

$ docker exec -it f2a55167c8e4 bash

After entering the container, we can execute various commands, such as View files in the container, open a terminal, etc.

5. Stop the container

In Docker, you can use the docker stop command to stop the running of the container.

Command line:

$ docker stop 容器ID

For example, if we want to stop the container with ID f2a55167c8e4, we can execute the following command:

$ docker stop f2a55167c8e4

6. Delete container

In Docker, you can use the docker rm command to delete a container.

Command line:

$ docker rm 容器ID

For example, if we want to delete the container with the ID f2a55167c8e4, we can execute the following command:

$ docker rm f2a55167c8e4

Summary

Through the above steps, We can successfully run images in Docker and enter, stop, and delete containers. Docker can help developers develop, test and deploy applications more conveniently, enhancing the portability and reliability of applications.

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