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I have an image to be updated with following command before each deployment.
$docker pull myusername/myproject:latest This command overwrites the previous image. How can I backup this image (or change it to a different tag locally without committing to networking repository? If there is anything wrong, I can restore the backup.
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Restore your dataUse docker pull to restore images you pushed to Docker Hub. If you backed up your images to a local tar file, use docker image load -i images. tar to restore previously saved images. Re-create your containers if needed, using docker run , or Docker Compose.
back up docker containers by exporting the docker container file system as a tar archive using the docker export command. You can later on create a new docker image from that tar archive with the docker import command.
How can I backup this image
Simply use the docker save command. $ docker save myusername/myproject:latest | gzip -c > myproject_img_bak20141103.tgz
You will later be able to restore it with the docker load command. gunzip -c myproject_img_bak20141103.tgz | docker load
or change it to a different tag locally without committing to networking repository?
Use the docker tag command: $ docker tag myusername/myproject:latest myusername/myproject:bak20141103
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For completeness: For Docker on Windows the following syntax applies:
docker save -o container-file-name.tar mcr.microsoft.com/windows/nanoserver:1809
docker load -i "c:\path\to\file.tar"
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