How docker packages containers into tar archives

Docker's compressed package refers to the packaged compressed file of Docker's image file and container file. It is usually compressed in tar package format to facilitate migration and backup between different Docker hosts.

Docker is an open source containerization platform that helps developers develop, deploy and run applications. By packaging the application into an independent container, Docker packages all related files such as the application, dependencies, and configurations together. The operation of these files will not be affected by the underlying system, greatly improving the portability and speed of the application. Deployability.

Docker's container and image are the two core concepts of Docker. The container is the entity running on Docker, and the image is the packaging file of the Docker container running environment. When Docker creates a container, it first copies it from the image file and then runs the application in the container, so the importance of the image file is self-evident. Once we create a Docker container on a certain Docker host, we need to package and export the container to other hosts for deployment. At this time, we need to use the compression package function of Docker.

Docker’s compression package function can package containers and image files into tar packages, and then upload, download, share and other operations. Normally, we can use Docker's command line tool to export the container as a .tar file, for example:

docker export 9612d51dc266 > mycontainer.tar

This command will export the container with the ID 9612d51dc266 as the mycontainer.tar file. Then we can use the docker import command to import the .tar file into other Docker hosts, such as:

docker import mycontainer.tar

In this way, the .tar file can be imported into docker, and then we can use the docker run command to run the container.

At the same time, Docker's compressed package can also be used to back up Docker containers and image files. For example, we can use the following command to back up a Docker image:

docker save redis > redis.tar

This command changes the image name to redis The image is packaged into a .tar file. We can use the docker load command to load this .tar file and create a new Docker image:

docker load < redis.tar

The above is the basic method of using Docker’s compression package function, which can help us facilitate the transfer between different Docker hosts Migrate, back up and share Docker containers and image files.

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