[Samba] Shadow Copy2 & zfs Snapshots
lists.samba.org at sjau.ch
lists.samba.org at sjau.ch
Thu May 28 07:15:28 UTC 2020
Hi there
I did investigate the problem a bit more. I also setup a test server and
a test vm (for windows) and then I used a live data example, copied it
to the test server including snapshots. After each test I did roll back
the snapshots to 2020-05-27 13:00 UTC.
The snapshots existing in the test server for that dataset until
yesterday when I run the tests can be found here
https://paste.simplylinux.ch/view/raw/f01a7654 ) as well as the
(current) output of /shadowcopy2/.zfs/snapshot done with a simple ls -al
( https://paste.simplylinux.ch/view/raw/b8f4ab4f ).
At the end you'll find the full /etc/samba/smb.conf file content.
For the test I did create 3 different shares. One that doesn't use the
prefix at all (sc2norm), one that uses the prefix but is not using BRE
(sc2snap) and one that uses the snap prefix with BRE (sc2bre).
I also tested with enforcing SMB3 but that did not have any effect. In
the samba config I just allow VPN IPs to access the server and the
shares for this test setup, so no additional security measures were taken.
In the Windows VM I just mounted the shares with a cmd.exe terminal and run:
net use n: \\IP-OF-TEST-SERVER\sc2norm
net use o: \\IP-OF-TEST-SERVER\sc2snap
net use p: \\IP-OF-TEST-SERVER\sc2bre
For each of the shares I did first check one specific file and
screenshotted the "old versions" listed in Windows. Then I edited that
file and took another screenshot.
When using the sc2norm share, I got the following results:
[sc2norm]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:format = easysnap-hourly_%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:sort = desc
vfs objects = shadow_copy2
- Searching for old versions did show all previous edits on the file:
https://images.sjau.ch/img/320efef3.png
- After editing it and doing a search again, it did show a new previous
version: https://images.sjau.ch/img/a98e6e08.png
When using the snapprefix but no BRE, I got the following results:
[sc2snap]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:delimiter = _
shadow:format = _%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:snapprefix = ^easysnap-hourly
shadow:sort = desc
vfs objects = shadow_copy2
- Searching for old versions did not show all the previous edits on the
file: https://images.sjau.ch/img/449eabcc.png --> several edits from
2020-05-26 are missing
- After editing it and doing a search again, it did show the last edit
also, but still missing edits from 2020-05-26:
https://images.sjau.ch/img/00ea231e.png
When using the snapprefix with BRE, I got the same results as without BRE:
[sc2bre]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:delimiter = _
shadow:format = _%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:snapprefix =
^easysnap-\(frequent\)\{0,1\}\(hourly\)\{0,1\}\(daily\)\{0,1\}\(monthly\)\{0,1\}
shadow:sort = desc
vfs objects = shadow_copy2
- Searching for old versions did not show all the previous edits on the
file: https://images.sjau.ch/img/07962cc8.png --> several edits from
2020-05-26 are missing
- After editing it and doing a search again, it did show the last edit
also, but still missing edits from 2020-05-26:
https://images.sjau.ch/img/a89ab810.png
Also in earlier tests with other datasets I noticed a strange behaviour
that I couldn't replicated otherwise: When using snapprefix with BRE and
searching for old version, it did list some (not all) old versions.
After editing the file and doing the search again, it did not show any
old versions at all. I have encountered that serveral times but have
been unable to replicated this behaviour consistently.
smb.conf:
[global]
security = user
passwd program = /run/wrappers/bin/passwd %u
pam password change = false
invalid users = root
# protocol = SMB3
server string = NixTesti
workgroup = WORKGROUP
hosts allow = 127.0.0.1, 10.10.20.0/24
map to guest = bad user
[sc2bre]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:delimiter = _
shadow:format = _%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:snapprefix =
^easysnap-\(frequent\)\{0,1\}\(hourly\)\{0,1\}\(daily\)\{0,1\}\(monthly\)\{0,1\}
shadow:sort = desc
vfs objects = shadow_copy2
[sc2norm]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:format = easysnap-hourly_%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:sort = desc
vfs objects = shadow_copy2
[sc2snap]
browseable = yes
create mask = 0644
directory mask = 0755
guest only = yes
hosts allow = 127.0.0.1, 10.10.20.0/24
path = /shadowcopy2
read only = no
shadow:delimiter = _
shadow:format = _%Y-%m-%d-%H-%M-UTC
shadow:localtime = yes
shadow:snapdir = .zfs/snapshot
shadow:snapprefix = ^easysnap-hourly
shadow:sort = desc
vfs objects = shadow_copy2
On 18.05.20 06:13, lists.samba.org--- via samba wrote:
> Hi there
>
> I'm having some troubles with Shadow Copy2 & zfs Snapshots. I have
> hourly and daily snapshots. If I use the following settings it works
> (but omits daily snapshots):
>
> vfs objects = shadow_copy2
> shadow:snapdir = .zfs/snapshot
> shadow:sort = desc
> shadow:localtime = yes
> shadow:format = easysnap-hourly_%Y-%m-%d-%H-%M-UTC
>
> However when I try to use the BRE with the prefix, so that daily and
> hourly snapshots would be included, it won't work (no previous old
> versions being shown in Windows file properties):
>
> vfs objects = shadow_copy2
> shadow:snapdir = .zfs/snapshot
> shadow:sort = desc
> shadow:localtime = yes
> shadow:format = _%Y-%m-%d-%H-%M-UTC
> shadow:snapprefix = ^easysnap-\(hourly\)\{0,1\}\(daily\)\{0,1\}
> shadow:delimiter = _
>
> Any suggestions why it won't work with the BRE?
>
> sjau
>
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