From owner-freebsd-questions@FreeBSD.ORG Mon Feb 8 21:27:44 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 740F81065672 for ; Mon, 8 Feb 2010 21:27:44 +0000 (UTC) (envelope-from amvandemore@gmail.com) Received: from mail-px0-f203.google.com (mail-px0-f203.google.com [209.85.216.203]) by mx1.freebsd.org (Postfix) with ESMTP id 478568FC14 for ; Mon, 8 Feb 2010 21:27:44 +0000 (UTC) Received: by pxi41 with SMTP id 41so7246953pxi.27 for ; Mon, 08 Feb 2010 13:27:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=Ohmzb4jIIRQFNqbyQSuwTZh44aW3R/pw8ZKvd9uI6rQ=; b=YVjxsxGLTB1q5A4MI1qh348MyRAv2L0Y4UceYQsg2d/aLbrXQOm04gc2ZkJ2kauamF I6Rggg5Ljc/vQD3vXcDRMqMWw9SlJ5wNxZLfVpPITWwI0Za4VL7EsLCaDXftNoZD9wMS 57J9R5/o3WuGHAzBWJ8wwbkKszqYpjm0aPs44= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=RBlh3wIm8HWMCpq3KEIKbtb4srB0qEtBq7s/fVNNBJ2356gjPOFixRV+d2dGGKvSid 0CwRGLQMXdn5MFA3bvvdsjxFzO4cOjfKIw4skukF4sa0q6iul3zeLyJv3vZhOx/yi8qx ge8fJokWs/TPt1FDb/Rk2ZQLCdFK6/16Pg28I= MIME-Version: 1.0 Received: by 10.143.21.25 with SMTP id y25mr4671900wfi.206.1265664463811; Mon, 08 Feb 2010 13:27:43 -0800 (PST) In-Reply-To: <20100208211524.GA57127@eggman.experts-exchange.com> References: <12972016.97.1265661043611.JavaMail.root@goblin> <32433176.107.1265661327344.JavaMail.root@goblin> <6201873e1002081309m6a2d4916u828d39f1e0c9c2a@mail.gmail.com> <20100208211524.GA57127@eggman.experts-exchange.com> Date: Mon, 8 Feb 2010 15:27:43 -0600 Message-ID: <6201873e1002081327k20bb39aey5a24d1b9337e41f9@mail.gmail.com> From: Adam Vande More To: Jason Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: "Richard L. Houston" , freebsd-questions@freebsd.org Subject: Re: Updating packages in Jails X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Feb 2010 21:27:44 -0000 On Mon, Feb 8, 2010 at 3:15 PM, Jason wrote: > Use this as a starting point >> >> http://www.freebsd.org/doc/handbook/jails.html >> >> Anyways, host and jail need to run the exact same kernel. Normally I'll >> build my kernel and install it into the base as well as each individual >> jail >> so everything is consistent. >> > > Why do they need to run the exact same kernel? I didn't see that anywhere > in > the document, unless I missed it. > > thanks > They aren't a full form of visualization in terms of having a hypervisor, as it is dependent the system calls coming from a jail being the same calls that are present in the host kernel. Mismatched kernel version could break that mapping. Which is also why jails are a faster form of virtualization because all the call mappings are 1:1. At least that's my understanding. -- Adam Vande More