How to save docker running image

Docker is a very popular open source application container engine that can help developers package applications and dependent libraries, environments and other components into an independent running environment, simplifying the deployment, management and expansion of applications. In the process of using Docker for application development and deployment, you often encounter situations where you need to save and share Docker images. In this article, we will discuss how to run images in Docker and save them.

1. Run the Docker image

Before running the Docker image, you need to meet the following conditions:

1. Install and configure the Docker engine, which can be downloaded from the Docker official website and installation.

2. Download a Docker image. You can search and download the image you need through Docker Hub, or you can build an image yourself.

Next, we will demonstrate how to run a Docker image through the command line.

1. Download an Ubuntu image through Docker Hub:

$ docker pull ubuntu:latest

2. Run the image and enter the container:

$ docker run -it --name my-ubuntu ubuntu:latest /bin/bash

This command will download the latest version of the Ubuntu image and Start a new container. The -it option is to start an interactive terminal, the --name option is to name the container, and /bin/bash is the command to be run in the container. If everything is running fine, you will be in Ubuntu's command line terminal.

2. Save the Docker image

During the process of running the Docker image, you may want to make some modifications to the image and save these modifications. Or, you might want to share your own built Docker image with others. In this case, you need to save the Docker image locally or upload it to an image repository such as Docker Hub.

1. Save the image locally

Through the docker commit command, you can save the modification of a container as a new image. Assuming that you have already run an Ubuntu container and modified some configuration files in the previous steps, you now need to save this container as a new image. You can run the following command:

$ docker commit my-ubuntu my-ubuntu:v1.0

This command will save the container named my-ubuntu as a new image my-ubuntu:v1.0. You can run the docker images command to view all your Docker images.

2. Upload the image to Docker Hub

You can also upload your own Docker image to a mirror repository such as Docker Hub to share it with others. To upload a Docker image, you need to have a Docker Hub account and add the account to the Docker configuration file. Then, you can upload the image to Docker Hub with the following command:

$ docker tag my-ubuntu:v1.0 my-dockerhub-account/my-ubuntu:v1.0
$ docker login
$ docker push my-dockerhub-account/my-ubuntu:v1.0

This command will rename the image my-ubuntu:v1.0 to my-dockerhub- account/my-ubuntu:v1.0, where my-dockerhub-account is your Docker Hub account name. Next, you need to log in to your Docker Hub account and upload the image through the docker push command.

3. Summary

This article introduces how to run images in Docker and save them. Through these methods, the image can be easily modified and shared during the development process, which facilitates application development, deployment, and management. Hope this article is helpful to you.

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