Tutorial on importing and exporting Docker containers

background

The popularity of Docker is closely related to its easy sharing and portability of containers. Users can not only submit containers to public servers, but also export containers to local file systems. Similarly, we can also import the exported container back into the Docker runtime environment.

Method 1: Import and export of containers (export and import)

1. View the container that needs to be exported

docker ps -a

2. Export

The exported tar file is transferred to the machine to be imported

docker export container name or container ID > exported path and tarball name

docker export centos> centos.tar

3. Import

docker import tarball path custom image name: TAG (default is latest)

docker import centos.tar test/centos 

Now there is a new image on the new machine, and you can use this image to directly generate a container.

Method 2: Export and import of images (save and load)

1. Save the image

docker save > Customize tarball image name: TAG (default is latest)

docker save > mysql.tar pinpointdocker/pinpoint-mysql:1.8.3

2. Load import

docker load < mysql.tar 

The difference between docker export and docker save

1. Docker save saves the image, and Docker export saves the container.

2. Docker load is used to load image packages, and Docker import is used to load container packages, but both will be restored to images;

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