To push a Docker image to a registry, you first need to tag the Docker image with the registry URL, repository name, and appropriate tag using the docker tag command. For example:
docker tag my_image registry.example.com/my_repository:my_tag
This command will tag the my_image Docker image with the URL registry.example.com, repository name my_repository and tag my_tag.
After tagging the image, use the docker push command followed by the tagged image name to push the image to the registry. For example:
docker push registry.example.com/my_repository:my_tag
This command will push the my_image Docker image to the registry with URL registry.example.com, repository name my_repository, and tag my_tag.
Note that you need to be authenticated to the registry before you can push the image. For more information, refer to the Docker documentation on docker push.