How to export tar package from docker image

In Docker, the export of the image can be completed by packaging it into a .tar file. This method allows us to export the image to anywhere and import it for use at a later point in time. This article will introduce how to use Docker to export an image into a tar package.

1. Preparation

Before exporting the image, you need to ensure that you have installed Docker and have administrator rights.

2. Find the image to be exported

First, we need to find the ID of the image to be exported. You can use the following command to list the IDs of all images:

$ docker image ls

After finding the corresponding image ID, record it.

3. Export the image

Before exporting the image, make sure you have stopped the container. You can stop a running container with the following command:

$ docker stop <CONTAINER_NAME>

Note: If the running container is not stopped, you will not be able to export the image of the container.

The command to export the image is as follows:

$ docker save <IMAGE_ID> -o <TAR_FILENAME>

Among them, <IMAGE_ID> is the image ID to be exported, and <TAR_FILENAME> is the exported file name.

For example, if you want to export the image with the ID "abc123def456", you can use the following command:

$ docker save abc123def456 -o myimage.tar

4. Import the image

After exporting the image, It can be imported and used elsewhere. Use the following command to import the image:

$ docker load -i <TAR_FILENAME>

Where, <TAR_FILENAME> is the name of the .tar file to be imported.

For example, if you want to import a file named "myimage.tar", you can use the following command:

$ docker load -i myimage.tar

After the import is successful, you can use the following command to view the imported image:

$ docker image ls

Through the above steps, you have successfully completed the export and import of the Docker image. This method allows you to easily export the image to other places and import it for use at a later point in time.

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