[Csync2] Can csync2 delete files/folders on destination host that do not exist on source?

[Ali Nebi]

Hello,

Sorry for my delay and thank you for your reply.

After reading your answer, now i understand how it works.

Thank you again.

Regards,
Ali

On Sat, Oct 27, 2012 at 2:34 PM, Lars Ellenberg
<lars.ellenberg at linbit.com>wrote:

> On Fri, Oct 26, 2012 at 05:10:25PM +0300, Ali Nebi wrote:
> > Hi,
> >
> > I'm new to csync2 and i'm just started using it in our environment for
> > synchronization of files. I was using rsync for syncing, but wanted to
> test
> > csync2 and to learn how it works. I got it working just fine regarding
> sync
> > together with lsyncd, but I have a question regarding deleting
> > files/folders from destination host that do not on source.
> >
> > Using rsync I can keep files/folders in sync including '--delete' option.
> > This way rsync delete from destination host everything that do not exist
> on
> > source host. Can csync2 do same?
>
> csync2 does only ever push those *changes* it is aware of.
>
> At some point it recorded a "local state" into its data base.
> At a later point, it verifies the then current local state against the
> recorded state.
> The *changes* in this local state are then pushed to the peer(s).
>
> Which means, for csync2, to push out a "delete", it needs to be aware
> that there had been a deletion. You need to tell it that at some point,
> there had been a local file, but now it is no longer...
>
> There are two ways to achieve that.
> To "delete remotely", you could locally mark as dirty a file that does
> not exist:
>         csync2 -m this-file-exists-only-on-peer
>         csync2 -uv this-file-exists-only-on-peer
>
> To make the peer(s) look like the node you chose to be master,
> on all nodes do:
>   csync2 -cIr /
> on the master do:
>   csync2 -TUIX
>   csync2 -uv
> (that is not something you should do as normal operation,
>  but only on initial setup, or when integrating a new node,
>  possibly occasionally as maintenance).
>
> > I run following test:
> >
> > on host1 i create:
> >
> > /var/www/html/test1
> > /var/www/html/test2
> >
> > They are successfully synced to host2. Now on host2 i create
> >
> > /var/www/html/test3
> >
> > And on host1 i run sync again, what i see is that 'test3' folder is not
> > deleted on host2.
>
> Of course.
>
> > They I decided on host1 to create one more folder:
> >
> > /var/www/html/test4.
> >
> > This new folder was synced to host2, but  'test3' folder is still not
> > removed. Is there a way to do this using csync2?
>
> See above: csync2 is push only, and it pushes changes that happened
> locally.
>
> Test3 never existed, so it was not deleted locally, no change to test3,
> nothing to push out...
>
> But it is symetrical, so host2 had been expected to sync its test3
> folder over to host1... then, if you delete it on host1 again, that
> would be propagated back to host2.
>
> If you want host2 to always be "slave", you can configure it so,
> but you still need to trigger pushes (csync2 -x runs) on it,
> which would then make host1 aware of the creation of test3,
> but refuse it.
> On the next push from host1 to host2 it would be deleted.
>
>
> --
> : Lars Ellenberg
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com
>
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
> _______________________________________________
> Csync2 mailing list
> Csync2 at lists.linbit.com
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>



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