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It has been asked on #docker-dev recently if it was possible to attach a volume to a container after it was started. At first, I thought it would be difficult, because of how the mnt namespace works. Then I thought better :-) TL,DR To attach a volume into a running container, we are going to: use nsenter to mount the whole filesystem containing this volume on a temporary mountpoint; create a bind mount from the specific directory that we want to use as the volume, to the right location of this ...