[Csync2] cysnc2 vs linking hackery

[Giampaolo Tomassoni]

From: Rafiu Fakunle [mailto:rafiu at openfiler.com]
> Hi Giampaolo,

Hi,


> Giampaolo Tomassoni wrote:
> > From: csync2-bounces at lists.linbit.com
> >   
> >> [...]
> >
> > I guess Rafiu would like to sync metadata with it.
> Precisely.
> 
> >  If this is the case, I'm not shure csync2 can help.
> >   
> 
> :(
> 
> > Don't know what's supposed to be in /var/lib/nfs (it's years I 
> don't use it anymore), but the content of /var/cache/samba looks 
> like a lot of BDBs, which are not safe to be syncd through csync2.
> >   
> 
> double :(. No way around this? Perhaps using samba's tdbbackup tool in 
> some form? I *really* don't want to use a cluster_meta block device if 
> it can be helped.

tdbbackup seems to make a backup of the tdbs files by creatings files with same name and differente extension. You could probably synch them and then "recover" the tdbs by renaming the backup files. But this must probably happen when samba is not yet running on the destinating system. I mean, it could possibly happen in a fallback before it is fully brought up.

This would need some testing, anyway.

giampaolo


> 
> Thx,
> 
> 
> R.
> 
> > giampaolo
> >
> >   
> >> Michael.
> >>
> >>     
> >>> I read in an ML post that csync2 is only recommended for slow 
> >>> changing config files. How would that apply to metadata for services 
> >>> like nfs , Samba/winbind etc. Could I use csync2 to replicate 
> >>> /var/lib/nfs and /var/cache/samba for instance?
> >>>
> >>> If csync2 is not the way to go, how about a cross between the 
> >>> metadata volume and some other [d|i]notify based solution where 
> >>> local changes (on active primary) are synced to the metadata volume 
> >>> and then synced back to place (on passive secondary), controlled as 
> >>> a heartbeat resource, when a failover occurs.
> >>>
> >>> TIA
> >>>
> >>> R.
> >>>       
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> >>     
> >
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>