Description
Hi,
I upgraded my Slurm cluster from Ubuntu 20.04 to 24.04 (and also Apptainer).
In the new system I can't use overlay images with fakeroot on CephFS storage anymore.
Creation with overlay create --fakeroot --size 10240 foo.img seems to work, but the created image is not recognized as ext3 by "file" (says "data")
When trying to use the image with eg. shell --fakeroot --overlay foo.img docker://ubuntu I get:
FATAL: while loading overlay images: failed to open overlay foo.img: image format not recognized
Overlay images on local block storage (eg. /tmp) work.
As mentioned this operation worked in my "old" system with the same CephFS mount (Ceph Cluster has Ceph 15):
Ubuntu 20.04 (works):
ceph 15.2.17
apptainer 1.3.3
kernel 5.4.0-200
Ubuntu 24.04 (fails)
ceph 19.2.0
apptainer 1.3.6/1.4.1
kernel 6.8.0-55
Can someone give me a hint what's happening?
thank you