Re: CephFS snapshots with samba shadowcopy

[Sebastian Knust <sknust@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I am providing CephFS snapshots via Samba with the shadow_copy2 VFS 
object. I am running CentOS 7 with smbd 4.10.16 for which ceph_snapshots 
is not available AFAIK.

Snapshots are created by a cronjob above the root of my shares with
  export TZ=GMT
  mkdir /cephfs/path/.snap/`date +@GMT-%Y.%m.%d-%H.%M.%S`
i.e. the exported shares are subfolders of the folder in which I create 
snapshots.

Samba configuration is:
  [global]
  ...
  shadow:snapdir = .snap
  shadow:snapdirseverywhere = yes
  shadow:format = _@GMT-%Y.%m.%d-%H.%M.%S_some-inode-number
  ...
  [sharename]
  ...
  path = /cephfs/path_to_main_root/share
  vfs object = shadow_copy2
  ...
  [other_share_with_different_root]
  ...
  path = /cephfs/path_to_different_root/other_share
  vfs object = shadow_copy2
  shadow:format = _@GMT-%Y.%m.%d-%H.%M.%S_other-inode-number

The inode numbers in the configuration are of course the inode numbers 
of the directory containing the snapshots.

Cheers
Sebastian

On 13.07.22 02:08, Bailey Allison wrote:
> Hi All,
>
>   
>
> Curious if anyone is making use of samba shadowcopy with CephFS snapshots
> using the vfs object ceph_snapshots?
>
>   
>
> I've had wildly different results on an Ubuntu 20.04 LTS samba server where
> the snaps just do not appear at all within shadowcopy, and a Rocky Linux
> samba server where the snaps do appear within shadowcopy but when opening
> them they contain absolutely no files at all.
>
>   
>
> Both the Ubuntu and Rocky samba server are sharing out kernel cephfs mount
> via samba, ceph version is 17.2.1 and samba version is 4.13.7 for Ubuntu
> 20.04 and 4.15.5 for Rocky Linux.
>
>   
>
> I have also tried using a samba fuse mount with vfs_ceph with the same
> results.
>
>   
>
> More so just curious to see if anyone on the list has had success with
> making use of the ceph_snapshots vfs object and if they can share how it has
> worked for them.
>
>   
>
> Included below is the share config for both Ubuntu and Rocky if anyone is
> curious:
>
>   
>
> Ubuntu 20.04 LTS
>
>   
>
> [public]
>
>          force group = nogroup
>
>          force user = nobody
>
>          guest ok = Yes
>
>          path = /mnt/cephfs/public
>
>          read only = No
>
>          vfs objects = ceph_snapshots
>
>   
>
> Rocky Linux
>
>   
>
> [public]
>
>          force group = nogroup
>
>          force user = nobody
>
>          guest ok = Yes
>
>          path = /mnt/cephfs/public
>
>          read only = No
>
>          vfs objects = ceph_snapshots
>
>   
>
> Regards,
>
>   
>
> Bailey
>
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--
Dr. Sebastian Knust      | Bielefeld University
IT Administrator         | Faculty of Physics
Office: D2-110           | Universitätsstr. 25
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