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List: unison-users
Subject: RE: [unison-users] Re: Master-Master Replication - Deletion of Files
From: Scott Bohler <sbohler () springsted ! com>
Date: 2008-06-02 14:54:45
Message-ID: 8CFA2FBEF17F4F46AF1E10D2A5578C88022631074B () exchange07 ! Springsted ! local
[Download RAW message or body]
Hi Brian,
Regarding cron jobs: Check the -repeat switch in the Unison manual. Uniso=
n can do this for you without additional scripting/cron jobs.
Scott
________________________________
From: unison-users@yahoogroups.com [mailto:unison-users@yahoogroups.com] On=
Behalf Of Brian
Sent: Monday, June 02, 2008 9:43 AM
To: unison-users@yahoogroups.com
Subject: [unison-users] Re: Master-Master Replication - Deletion of Files
Thank you, Alan.
I did some testing with Unison on one system shortly after putting in
this e-mail, and it does indeed remember and can tell when files were
deleted or created. I just made a root location on the same server,
synced it with an e-mail folder, and then I created a new e-mail.
Unison synced the new e-mail to the other root folder. I then went to
the replicated root folder, and deleted the e-mail there. Ran Unison
and it then deleted the e-mail in the actual e-mail folder and
disappeared.
I guess it would have helped if I did some testing first. Unison
definitely is a solution to a master-master replication for servers.
Although it is not real-time, real-time isn't needed with e-mail and
web site updates. I plan to set this up on a cron job that runs every
five minutes.
Then, for PHP session data, I will have a cron job that runs every
minute - but loop it inside that script to run every 10 seconds.
Session data is mission-critical when it comes to logging into
websites - especially if a user pulls the next page from the other
server. If the session file doesn't exist there, then the session
will look to have 'timed out'.
Brian S.
--- In unison-users@yahoogroups.com<mailto:unison-users%40yahoogroups.com>,=
Alan Schmitt <alan.schmitt@...>
wrote:
>
> On 1 juin 08, at 19:49, Brian wrote:
>
> > So since Unison is two-way, would it see that the file was deleted
> > from Server B and then delete it from Server A? Or would it do the
> > same as rsync and copy the deleted e-mail back from Server A to
> > Server B? I know there is something called preference, but I can't
> > exactly set that to delete or write either; because if the e-mail
> > comes in on one server, it would be immediately deleted upon the
> > next Unison job and not replicated if I understand correctly.
>
> Unison would deleted the email from Server A. It works by remembering
> the state of things at last synchronization, and is thus able to
> detect changes in the file content, creation of files, or deletion of
> files, and propagate them.
>
> Hope this helps,
>
> Alan
>
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<DIV dir="ltr" align="left"><SPAN class="707335314-02062008"><FONT face="Arial \
Narrow" color="#0000ff">Hi Brian,</FONT></SPAN></DIV> <DIV dir="ltr" \
align="left"><SPAN class="707335314-02062008"><FONT face="Arial Narrow" \
color="#0000ff"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN \
class="707335314-02062008"><FONT face="Arial Narrow" \
color="#0000ff">Regarding cron jobs: Check the -repeat switch in the \
Unison manual. Unison can do this for you without additional scripting/cron \
jobs.</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN \
class="707335314-02062008"><FONT face="Arial Narrow" \
color="#0000ff"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN \
class="707335314-02062008"><FONT face="Arial Narrow" \
color="#0000ff">Scott</FONT></SPAN></DIV> <DIV><SPAN \
class="707335314-02062008"></SPAN><FONT face="Arial Narrow" \
color="#0000ff"></FONT> </DIV> <DIV><FONT face="Arial Narrow" \
color="#0000ff"></FONT> </DIV> <DIV dir="ltr" align="left"><BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: #0000ff 2px solid;">
<DIV class="OutlookMessageHeader" lang="en-us" dir="ltr" align="left">
<HR tabIndex="-1">
<FONT face="Tahoma" size="2"><B>From:</B> unison-users@<wbr>yahoogroups.<wbr>com
[mailto:unison-<wbr>users@yahoogroup<wbr>s.com] <B>On Behalf Of
</B>Brian<BR><B>Sent:</B> Monday, June 02, 2008 9:43 AM<BR><B>To:</B>
unison-users@<wbr>yahoogroups.<wbr>com<BR><B>Subject:</B> [unison-users] Re:
Master-Master Replication - Deletion of Files<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV id="ygrp-text">
<P>Thank you, Alan.<BR><BR>I did some testing with Unison on one system
shortly after putting in<BR>this e-mail, and it does indeed remember and can
tell when files were<BR>deleted or created. I just made a root location on the
same server,<BR>synced it with an e-mail folder, and then I created a new
e-mail. <BR>Unison synced the new e-mail to the other root folder. I then went
to<BR>the replicated root folder, and deleted the e-mail there. Ran
Unison<BR>and it then deleted the e-mail in the actual e-mail folder
and<BR>disappeared.<BR><BR>I guess it would have helped if I did some testing
first. Unison<BR>definitely is a solution to a master-master replication for
servers. <BR>Although it is not real-time, real-time isn't needed with e-mail
and<BR>web site updates. I plan to set this up on a cron job that runs
every<BR>five minutes.<BR><BR>Then, for PHP session data, I will have a cron
job that runs every<BR>minute - but loop it inside that script to run every 10
seconds. <BR>Session data is mission-critical when it comes to logging
into<BR>websites - especially if a user pulls the next page from the
other<BR>server. If the session file doesn't exist there, then the
session<BR>will look to have 'timed out'.<BR><BR>Brian S.<BR><BR>--- In <A \
href="mailto:unison-users%40yahoogroups.com">unison-users@<WBR>yahoogroups.<WBR>com</A>, \
Alan Schmitt <alan.schmitt@<WBR>...><BR>wrote:<BR>><BR>> On 1 juin
08, at 19:49, Brian wrote:<BR>> <BR>> > So since Unison is two-way,
would it see that the file was deleted<BR>> > from Server B and then
delete it from Server A? Or would it do the<BR>> > same as rsync and
copy the deleted e-mail back from Server A to<BR>> > Server B? I know
there is something called preference, but I can't<BR>> > exactly set
that to delete or write either; because if the e-mail<BR>> > comes in on
one server, it would be immediately deleted upon the <BR>> > next Unison
job and not replicated if I understand correctly.<BR>> <BR>> Unison
would deleted the email from Server A. It works by remembering <BR>> the
state of things at last synchronization, and is thus able to <BR>> detect
changes in the file content, creation of files, or deletion of <BR>> files,
and propagate them.<BR>> <BR>> Hope this helps,<BR>> <BR>>
Alan<BR>><BR><BR></P></DIV><!--End group email --></BLOCKQUOTE>
</p>
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