Date: Fri, 30 May 2008 16:40:27 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Ceri Davies <ceri@submonkey.net> Cc: src-committers@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org, Michael Reifenberger <mike@reifenberger.com>, Alexander Leidinger <Alexander@Leidinger.net> Subject: Re: cvs commit: src/usr.sbin/jexec jexec.8 jexec.c Message-ID: <20080530162829.E85310@fledge.watson.org> In-Reply-To: <20080530145656.GB17008@submonkey.net> References: <200805261157.m4QBvnpF025029@repoman.freebsd.org> <20080526144831.K26343@fledge.watson.org> <20080526140735.GA35960@gw.reifenberger.com> <200805281309.49683.jhb@freebsd.org> <20080529140557.GA94385@gw.reifenberger.com> <20080529151233.I3678@fledge.watson.org> <20080529145319.GC94385@gw.reifenberger.com> <20080529155422.T3678@fledge.watson.org> <20080530165051.46452soq4pp07n28@webmail.leidinger.net> <20080530145656.GB17008@submonkey.net>
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On Fri, 30 May 2008, Ceri Davies wrote: >>>> Thats something that the admin should take care for. >>> >>> How might they do that? Remember that any command that works only when >>> the jail IP is "unambiguous" will become effectively non-deterministic as >>> a result of un-garbage collected jails. So >> >> Is it feasible to change the hostname of a dying jail? We could prefix it >> with some string at some point of the shutdown... > > We'd be better off just dropping all the connections at that point. TCP TIME_WAIT exists for a reason that it is better not to disregard. This question gets a bit more complicated in light of vimage, which is something we'll need to discuss at the August developer summit. Also, TIME_WAIT is just one example of a jail persisting due to continuing references to a credential -- there are other legitimate, albeit less common, reasons that it may occur, and those are also valid use cases. Robert N M Watson Computer Laboratory University of Cambridge
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