Re: K12OS: rsync as alternative to nis/nfs?
Chris Hobbs (chobbs@silvervalley.k12.ca.us)
Tue, 12 Feb 2002 22:09:41 -0800
Good points - in my case, since I'm mostly concerned with dealing with
/home, a student will only be logged (in theory...) into one app server
at a time, so the only syncing happening for his files will be between
that one app server and the file server. For /etc/whatever, I could
stagger the cron jobs to prevent this problem (ie, app1 sync at :01,
:07, :13, etc, while app2 syncs at :02, :08, :14 - ntp would be used to
assure everyone is at the right time). I'll check out those links in the
morning Eric - thanks!
Eric Harrison wrote:
>On Tue, 12 Feb 2002, Dan Young wrote:
>
>>Re: the interval for synching:
>>
>>If the maximum # of connections in your rsyncd.conf is set to one, you'll
>>never start a session while another is running, although this obviously
>>won't work if you plan to sync more than two servers.
>>
>>I've a wee bit of experience (emphasis on "wee bit") with the multiple rsync
>>session syndrome (our web server uses this to sync between a staging and
>>production server) and it gets a bit weird when sessions overlap.
>>
>>-Dan Young
>>-Parkrose School District
>>
>>>The bidirectional thing turns out to be trivial - the only challenge
>>>will be determining an appropriate interval - the shorter the better,
>>>obviously, but there needs to be enough time to finish synching before
>>>the next scheduled sync starts - trial and error will be the solution
>>>here :)
>>>
>
>Dan brings up a good point here: if you are doing bi-directional rsyncing
>among multiple servers, you'll run into some weird problems with temporary
>files.
>
>Envision edge server #1 syncing TO the master server at the same time that
>edge server #2 tries to sync FROM the master server. It seems like you could
>quickly run into some crippling loops, especially as the number of servers
>increases.
>
>LinuxWorld recently had an article on unison, an rsync-like utility designed
>for bi-directional synchronization:
>http://www.linuxworld.com/ic_788354_7077_1-3135.html
>
>Other, less hackish options include NFS replacements that deal with
>disconnected use such as coda or intermezzo:
>
> http://www.coda.cs.cmu.edu
> http://www.inter-mezzo.org
>
>
>-Eric
>
>
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