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I have a tarred docker repository created by using docker save.

I want to push this tar to a registry, say dockerhub. Is there a way we can do that without loading on local docker?

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Actually this is not possible as docker push command will look for a local image or a repository.
You will have to load your image first from tar file, the push it to your registry.

docker load --input repo.tar
docker image tag myrepo registry-host:5000/myrepo/myrepo:v1
docker image push registry-host:5000/myrepo/myrepo:v1

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