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You don't necesarily have to change the path to /var/lib/docker/volumes (I myself am not sure where you'd do that), but you can mount any folder path to a volume of a container. I use that in some of my docker-compose.yml files to mount specific directories where other containers deposit their files, i.e. to share my Let's Encrypt certificate between the proxy and Repository, so that the Repository may use it for SMTPS.
