How to copy Docker images from one host to another without using a repository

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You will need to save the Docker image as a tar file:

docker save -o <path for generated tar file> <image name>

Then copy your image to a new system with regular file transfer tools such as cp, scp or rsync(preferred for big files). After that you will have to load the image into Docker:

docker load -i <path to image tar file>

PS: You may need to sudo all commands.

EDIT:
You should add filename (not just directory) with -o, for example:

docker save -o c:/myfile.tar centos:16

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