replicating data over 2 servers

[nbari at unixmexico.com]

unison seems to be ok, but now i have another problem:

I am  trying to download some files from a server using unison via ssh,
the files are owned by www:www and mode rw only by the user (chmod 600),
but  I am  geting  an  Permission denied messages when trying to download
this files.

I can not login directly with user root to the server, but I can do su -
with the user that I use to acces to the server, so my question is, how
can download does files? i dont want to change permisions to does files. i
have already addes my user to the www group, but still geting the
Permission deniedd message. any idea?

thanks.





> nbari at unixmexico.com writes:
>
>> the problem when using rsync in both servers is that if data on server A
>> is  updated, and data on server B is updated at the same time, there is
>> a
>> chance to lost data.
>>
>> If a user writes to a file on server A and then rsyn is executed data
>> will
>> be lost, and so if a users writees on server B an rsync tryis to fecth
>> from server A data will be lost
>
> I haven't used this yet but it sounds like it fits the bill:
>
>   http://www.cis.upenn.edu/~bcpierce/unison/
>
>   Unison is a file-synchronization tool for Unix and Windows. (It also
>   works on OSX to some extent, but it does not yet deal with 'resource
>   forks' correctly; more information on OSX usage can be found on the
>   unison-users mailing list archives.) It allows two replicas of a
>   collection of files and directories to be stored on different hosts
>   (or different disks on the same host), modified separately, and then
>   brought up to date by propagating the changes in each replica to the
>   other.
>
>   Unison shares a number of features with tools such as configuration
>   management packages (CVS, PRCS, etc.), distributed filesystems
>   (Coda, etc.), uni-directional mirroring utilities (rsync, etc.), and
>   other synchronizers (Intellisync, Reconcile, etc). However, there
>   are several points where it differs:
>
>   [...]
>
> It's in /usr/ports/net/unison
>
>