How to use docker without connecting to the external network

Docker is a popular open source project that allows you to run applications on a single platform, including operating systems such as Windows, Linux, and macOS. Docker is very different from a virtual machine because it uses containers to isolate and run applications, rather than using a virtual machine to emulate an entire operating system.

However, sometimes you may need to use Docker without an external network connection. How to solve this problem? This article will introduce some methods and techniques to use Docker without an external network connection to improve your work and learning efficiency.

First, you need to download all required images from Docker Hub and save them locally. This can be done by running Docker on a computer with an external network connection and pulling the image from Docker Hub. Once all the required images have been downloaded and saved locally, you can package them and copy them to a computer without an external network connection. This can be done using Docker's save command. As shown below:

docker save -o <path for generated tar file> <image name>

Among them, the -o option is used to specify the path and file name of the generated tar file, and specifies the image name.

Next, copy the generated tar file to a computer without an external network connection. To complete the Docker installation on this computer, run the following command:

tar xf <path to the saved image tar>
docker load -i <path to image tar>

where the tar xf command is used to decompress the tar file and the -i option is used to specify the image file to be loaded into Docker. Note that this is not re-pulling the image on Docker Hub, but loading the image directly from a local file. Therefore, you don't need to be connected to the Internet.

Now, once all the required images are in your local Docker environment, you can use Docker commands as usual. You can create containers, run containers, build images, manage containers, etc. All operations can be performed without an external network connection. If you need new Docker images in the meantime, you will need to repeat the above process to download the images from a computer with an external network connection and store them locally.

To summarize, by downloading the Docker image and saving it locally, you can use Docker without an external network connection. While this will require some extra work, it allows you to use Docker without an internet connection, which can be very useful for some users.

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