Date: Sat, 17 Jul 2010 09:00:07 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Lowell Gilbert <freebsd-current-local@be-well.ilk.org> Cc: freebsd-current@freebsd.org, Alex Kozlov <spam@rm-rf.kiev.ua>, Gabor Kovesdan <gabor@freebsd.org> Subject: Re: periodic script in base system to run csup Message-ID: <4C416307.9000001@infracaninophile.co.uk> In-Reply-To: <44k4ov6nax.fsf@lowell-desk.lan> References: <20100716143621.GA9281@ravenloft.kiev.ua> <44k4ov6nax.fsf@lowell-desk.lan>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig1542F6D7EF7AAA6124ED2888 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 17/07/2010 24:04:38, Lowell Gilbert wrote: > Alex Kozlov <spam@rm-rf.kiev.ua> writes: >=20 >> On Fri, Jul 16, 2010 at 04:27:39PM +0200, Gabor Kovesdan wrote: >>> Em 2010.07.16. 16:23, Alex Kozlov escreveu: >>>> On Fri, Jul 16, 2010 at 03:58:33PM +0200, Gabor Kovesdan wrote: >>>> >>>> Thousands pc simultaneously try to access cvsup servers? >>>> Sound like a ddos to me. >>> Yes, this was the only concern and that's why I started this discussi= on. >> And because its periodic, We can't use portsnap solution (random delay= >> before csup start). >=20 > It's not completely impossible; periodic could spin off a separate shel= l > for it, with a random delay. It's not clear what the best way to deal > with the output would be, although several approaches present themselve= s. > It would be a lot more complicated than Gabor's approach, though. Simply ensuring the csup periodic job is the last one to run (/etc/periodic/daily/1000.csup ?) should give you the best of both worlds. You can insert a random delay of up to an hour and still deal with csup as a foreground job. All of the other periodic jobs will run as normal (and should help with randomising the time distribution of the csup runs too) -- you'll just have to wait a bit longer for the nightly e-mail to be produced. Even so, I think this is still likely to upset the cvsup servers: a whole timezone worth of machines hitting a small number of servers within one or two hours might be doable with portsnap / freebsd-update but cvsup requires a lot more effort server-side. Cheers Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate JID: matthew@infracaninophile.co.uk Kent, CT11 9PW --------------enig1542F6D7EF7AAA6124ED2888 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxBYw4ACgkQ8Mjk52CukIx/ZQCfWMuiyGsoD77lllg/aaF9dPaY j6sAn30E/jk37O4y+gR2Fqmn0Th5kvf4 =P5QY -----END PGP SIGNATURE----- --------------enig1542F6D7EF7AAA6124ED2888--
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