From owner-freebsd-hackers@FreeBSD.ORG Fri Sep 10 12:11:40 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A1DFD10656A7 for ; Fri, 10 Sep 2010 12:11:40 +0000 (UTC) (envelope-from atom@smasher.org) Received: from atom.smasher.org (atom.smasher.org [69.55.237.145]) by mx1.freebsd.org (Postfix) with SMTP id 55D2C8FC12 for ; Fri, 10 Sep 2010 12:11:38 +0000 (UTC) Received: (qmail 45614 invoked by uid 1000); 10 Sep 2010 12:11:37 -0000 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Date: Sat, 11 Sep 2010 00:11:37 +1200 (NZST) From: Atom Smasher In-Reply-To: Message-ID: <1009110004520.2000@smasher> MIME-Version: 1.0 OpenPGP: id=0xB88D52E4D9F57808; algo=1 (RSA); size=4096; url=http://atom.smasher.org/pgp.txt References: To: Ivan Voras X-POM: The Moon is Waxing Crescent (7% of Full) X-Hashcash: 1:20:1009101211:ivoras@freebsd.org::42x4J8mSW5t9PzQT:000000000000000 00000000000000000000000037jd X-Hashcash: 1:20:1009101211:freebsd-hackers@freebsd.org::Vh+w+txH1yRrnvSV:000000 0000000000000000000000002UOm Cc: freebsd-hackers@freebsd.org Subject: Re: How to disallow logout X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Sep 2010 12:11:40 -0000 On Fri, 10 Sep 2010, Ivan Voras wrote: > 1) power outage of the server > 2) power outage on the client > 3) network problems (ssh or TCP connection drop) > 4) administrative command (e.g. root executes "killall $shell") > > ? > > I don't think there is a way to protect from all of those, so any effort > in protecting from only part of the problem looks useless. ======================== you forgot cosmic rays, nuclear war and zombie apocalypse, among other failure modes. *NOTHING* is capable of protecting against everything; a good solution will most always have pitfalls; as a sysadmin/engineer/manager one has to either accept the pitfalls or find a more acceptable solution, which usually means different pitfalls. that doesn't mean a given solution is useless. -- ...atom ________________________ http://atom.smasher.org/ 762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808 ------------------------------------------------- "I am committed to helping Ohio deliver its electoral votes to the president [Bush] next year" -- Walden O'Dell, CEO of Diebold August 2003