[Samba] vfs_shadow_copy2 with snapprefix & delimiter options in samba 4.6.2

Mon Feb 19 07:53:02 UTC 2018

Hi,

I notice you're using 4.6.2 and I'm using 4.6.11. I made the following 
comment at some point within [global]:

   #disable "unix extensions" to avoid using "allow insecure wide links"
   #  for access to ../xxxx_SNAPS for BTRFS "previous versions" snapshots
   #  --it seems to have reverted once more to not need the below two 
settings
   ##unix extensions = no
   ##wide links = yes
   ##allow insecure wide links = yes

I don't know when the behaviour changed allowing me to remove the above. 
At some point I needed (some of??) the above to allow snapshots to work. 
Obviously these may introduce other issues in your setup, so best to 
check in 
https://www.samba.org/samba/docs/current/man-html/smb.conf.5.html to 
understand the implications of allowing wide links.

Regards,
Mike

On 18/02/2018 01:12, Edouard Guigné wrote:
> Hi,
>
> So I tried with a similar config to yours :
>
>   vfs objects = acl_xattr streams_xattr shadow_copy2
>   shadow:snapdir = /data/datashared/.snapshots
>   shadow:basedir = /var/datashared
>   shadow:sort = desc
>   shadow:localtime = yes
>   shadow:snapprefix = 
> ^\(monthly\)\{0,1\}\(weekly\)\{0,1\}\(daily\)\{0,1\}$
>   shadow:delimiter =  _UTC_
>   shadow:format = _UTC_%Y.%m.%d-%H.%M.%S
>   shadow:fixinodes = yes
>
> (I change IPG by UTC in case...)
>
> This does not work better...
> I notice you put btrfs in vfs objects
> I am using xfs + lvm (for snapshots). Do i have to add something 
> special in vfs objects for this file system ?
>
> Regards,
> Ed
>
>
> Le 17/02/2018 à 08:26, Michael Miller a écrit :
>> Hi
>>
>> (+mailing list again for the archives)
>>
>> My config which does show previous versions:
>>
>> # /usr/local/samba/sbin/smbd --version
>> Version 4.6.11
>>
>> To avoid having this config block within in each share, I define the 
>> following within the [global] section:
>>
>>   shadow:snapprefix = 
>> ^\(monthly\)\{0,1\}\(weekly\)\{0,1\}\(daily\)\{0,1\}$
>>   shadow:delimiter = _UTC_
>>   shadow:format = _UTC_%Y.%m.%d-%H.%M.%S
>>
>> And then in the config of the shares, I define:
>>
>> [someshare]
>>   vfs objects = acl_xattr btrfs shadow_copy2
>>   writable = yes
>>   path = /store/samba/someshare
>>   shadow:basedir = /store/samba/someshare
>>   shadow:snapdir = /store/samba/someshare_SNAPS
>>   shadow:sort = desc
>>   shadow:fixinodes = yes
>>
>> Within /store/samba/someshare_SNAPS are the snapshot directories 
>> themselves:
>>
>> # ls -1f /store/samba/someshare_SNAPS |tail -20
>> weekly_UTC_2018.01.29-01.00.01
>> daily_UTC_2018.01.30-01.00.01
>> daily_UTC_2018.01.31-01.00.02
>> monthly_UTC_2018.02.01-01.00.02
>> daily_UTC_2018.02.02-01.00.02
>> daily_UTC_2018.02.03-01.00.02
>> daily_UTC_2018.02.04-01.00.01
>> weekly_UTC_2018.02.05-01.00.01
>> daily_UTC_2018.02.06-01.00.01
>> daily_UTC_2018.02.07-01.00.01
>> daily_UTC_2018.02.08-01.00.01
>> daily_UTC_2018.02.09-01.00.01
>> daily_UTC_2018.02.10-01.00.02
>> daily_UTC_2018.02.11-01.00.01
>> weekly_UTC_2018.02.12-01.00.01
>> daily_UTC_2018.02.13-01.00.01
>> daily_UTC_2018.02.14-01.00.01
>> daily_UTC_2018.02.15-01.00.01
>> daily_UTC_2018.02.16-01.00.01
>> daily_UTC_2018.02.17-01.00.01
>>
>> This config works for me. It is possible that the regex you're trying 
>> to use is not fully basic regular expression compliant. I'm no expert 
>> on this, but ran into problems myself when trying to come up with a 
>> working expression.
>>
>>
>> On 17/02/2018 01:07, eguigne at pasteur-cayenne.fr wrote:
>>> Hello,
>>>
>>> I tried this also, unfortunatly it does not work better.
>>>
>>> I did not find many examples of usage with this options.
>>> Did you succeeded to make it work ?
>>> If yes, what was your configuration ?
>>>
>>> Regards,
>>> Ed
>>>
>>>> Hi,
>>>>
>>>> As per the list.samba.org link, did you try including the delimiter
>>>> within the format, ie as shown in the following?
>>>>
>>>> shadow:snapprefix = ^d[A-Za-z0-9]*y$
>>>> shadow:delimiter = _IPG_
>>>> shadow:format = _IPG_%Y.%m.%d-%H.%M.%S
>>>>
>>>> Regards,
>>>> Mike
>>>> On 16/02/2018 16:50, Edouard GuignÃ© via samba wrote:
>>>>> Hello Dear Samba Users,
>>>>>
>>>>> I have sucessfully set a samba share on a centos 7 box (samba 4.6.2)
>>>>> and succeeded into make work snapshots (vfs_shadow_copy2 with xfs and
>>>>> lvm).
>>>>> The snapshots appears well in windows previous versions.
>>>>>
>>>>> However, I expected to go further with snapshots and use the options
>>>>> "shadow:snapprefix" and "shadow:delimiter"in order to filter daily,
>>>>> weekly snapshots...
>>>>> I did not succeed to do it ; nothing is displayed in windows previous
>>>>> versions when "shadow:snapprefix" and "shadow:delimiter" are set.
>>>>>
>>>>> My snapshots are with the following format, e.g. for daily 
>>>>> snapshots :
>>>>> daily_IPG_%Y.%m.%d-%H.%M.%S
>>>>> I tried
>>>>> shadow:snapprefix = ^d[A-Za-z0-9]*y$
>>>>> shadow:delimiter = _IPG_
>>>>> shadow:format = %Y.%m.%d-%H.%M.%S
>>>>>
>>>>> I find an example at
>>>>> https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.3/html/administration_guide/sect-smb 
>>>>>
>>>>> and I also notice that there is a bug :
>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1329716
>>>>> https://lists.samba.org/archive/samba/2017-April/207869.html
>>>>>
>>>>> May you help me to configure snapprefix and delimiter options ?
>>>>>
>>>>> Best Regards,
>>>>> Ed
>>>>
>>>>
>>>
>>
>>
>