Where is the image packaged by Docker stored?

Docker is a popular virtualization tool that packages applications into containers, enabling cross-platform and rapid deployment. When using Docker, a common question is: Where is the image packaged by Docker stored?

First of all, you need to understand the concepts of image and container in Docker. Image is the way Docker packages applications, including the application's code, running environment, dependencies, etc. A container is a running instance created based on an image and has its own file system and network connection.

In Docker, images can be saved in local or remote warehouses. The local image is saved in the host's file system, usually in the /var/lib/docker directory. Each image has a unique ID, which can be viewed through the docker images command.

In local storage, Docker will divide the image into multiple layers, each layer containing changes based on the previous layer. This design allows images to be shared and transferred efficiently because only the changed layers need to be transferred, rather than the entire image.

In addition to local storage, Docker also provides centralized image warehouses, such as Docker Hub. Docker Hub is a public image warehouse where users can upload images they create and download images created by others.

Users can also create their own private warehouse to better manage their images. Docker provides open source private warehouse software Docker Registry. Users can build their own private warehouse and integrate it with Docker Hub.

In short, Docker images can be saved in local or remote warehouses. The local image is stored in the host's file system, while the remote repository can be a public or private repository. Users can choose where to save the image according to their needs.

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