The Docker docs also has a breakdown of incompatibilities: https://docs.docker.com/engine/userguide/storagedriver/overlayfs-driver/#/overlayfs-compatibility Notably, there's the open(2) issue that has already been mentioned. The second issue is that rename(2) can fail if trying to move a dir across the lower and upper dirs: $ mkdir lower upper work merged $ mkdir lower/dir $ sudo mount -t overlay overlay \ -olowerdir=$PWD/lower,upperdir=$PWD/upper,workdir=$PWD/work \ merged $ python -c 'import os; os.rename("merged/dir", "merged/dir2")' Traceback (most recent call last): File "<string>", line 1, in <module> OSError: [Errno 18] Invalid cross-device link So you have to watch for EXDEV and fall back on copying. _______________________________________________ cloud mailing list -- cloud@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to cloud-leave@xxxxxxxxxxxxxxxxxxxxxxx
