[mirror-admin] push mirroring plans

[Ricardo J. Barberis]

El Miércoles 17 Diciembre 2008, Jesse Keating escribió:
> On Tue, 2008-12-16 at 22:17 -0600, Matt_Domsch at Dell.com wrote:
> > Thoughts?
>
> Why not something far far more simple, which is a site checksum.  Each
> time we put new content on the site, we update a checksum (it doesn't
> have to be an /actual/ checksum, just some int we increase).  Mirrors
> can more frequently stat the value of this checksum against what they
> have, and if it changes, they know to do a full rsync run.  If it
> doesn't change, they don't do an rsync run.
>
> This would allow mirrors to ramp up their polling of us to every 10
> minutes or even less, without worry of swamping our server with stats of
> files.

This is a good idea and could probably be done by mirror_manager, but be 
careful: we don't want every server to know about the updates and pull them 
all at the same time!!

> Any other solution is going to be "polling" in some form or 
> another, either a daemon listening for an ssh push, or a email server
> waiting for mail to come in.  This more simple method doesn't rely on
> the setup of additional infrastructure on the mirror side, just a slight
> adjustment to the cron jobs mirrors already have in place.  If we make
> the file available via rsync at a top level, or even different files at
> different logical sections of the master mirror it would be quite
> simple.

Hey, we could even rsync that checksum file first, before deciding if we 
can/have to start mirroring. That file could also tell us:
- No need to sync
- You have to sync, but later (e.g because someone else is syncing)
- You may sync now

Best regards,
-- 
Ricardo J. Barberis 
Senior SysAdmin - I+D 
Dattatec.com :: Soluciones de Web Hosting 
Su Hosting hecho Simple..! 

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