From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1S1MVX-0008T4-DJ for garchives@archives.gentoo.org; Sat, 25 Feb 2012 18:38:11 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 28B30E0DC7; Sat, 25 Feb 2012 18:37:48 +0000 (UTC) Received: from mail-ee0-f53.google.com (mail-ee0-f53.google.com [74.125.83.53]) by pigeon.gentoo.org (Postfix) with ESMTP id 7ED20E0D9F for ; Sat, 25 Feb 2012 18:35:29 +0000 (UTC) Received: by eekb47 with SMTP id b47so665942eek.40 for ; Sat, 25 Feb 2012 10:35:28 -0800 (PST) Received-SPF: pass (google.com: domain of emailgrant@gmail.com designates 10.213.15.209 as permitted sender) client-ip=10.213.15.209; Authentication-Results: mr.google.com; spf=pass (google.com: domain of emailgrant@gmail.com designates 10.213.15.209 as permitted sender) smtp.mail=emailgrant@gmail.com; dkim=pass header.i=emailgrant@gmail.com Received: from mr.google.com ([10.213.15.209]) by 10.213.15.209 with SMTP id l17mr2123513eba.147.1330194928853 (num_hops = 1); Sat, 25 Feb 2012 10:35:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=Q/bBh7xAHYUT8ijBzQd/RZjPALiUXlJTDjQpeYXq9Us=; b=NVEa6vOwSpKeEQQfkSDnfNlFGChutc8pExuflkHw7dgRQsT46NAKldCNJgZ5BRgObo IOHUz3xkBcLraQ5fST/tiuLxijOjYbE6Cr3zVb3qfsfvVGWgZ3AgD4btUrDBNKdBYT8s qMQTLzX3fU84JHqM5DqRFXyKoCH6psA6VCQSM= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.213.15.209 with SMTP id l17mr1592494eba.147.1330194928786; Sat, 25 Feb 2012 10:35:28 -0800 (PST) Received: by 10.213.113.148 with HTTP; Sat, 25 Feb 2012 10:35:28 -0800 (PST) In-Reply-To: <4F48D510.9010803@nileshgr.com> References: <201202251218.59928.michaelkintzios@gmail.com> <4F48D510.9010803@nileshgr.com> Date: Sat, 25 Feb 2012 10:35:28 -0800 Message-ID: Subject: Re: [gentoo-user] Re: Safe way to test a new kernel? From: Grant To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: 062410cc-8d01-418c-aa31-7c9b184e2325 X-Archives-Hash: d2691300f044461b3cdb0da6fcf3154b >>>>>> I need to test a kernel config change on a remote system. =A0Is ther= e a >>>>>> safe way to do this? =A0The fallback thing in grub has never worked = for >>>>>> me. =A0When does that ever work? >>>>> >>>>> You can press ESC in the Grub screen and it will take you to text-onl= y >>> >>> mode. >>> >>>>> =A0There, you select an entry, press "e" and edit it. =A0Press ENTER = when >>> >>> you're >>> >>>>> finished, and then press "b" to boot your modified entry. >>>>> >>>>> That way, you can boot whatever kernel you want if the current one >>> >>> doesn't >>> >>>>> work. >>>> >>>> I can't do that remotely though. =A0I'm probably asking for something >>>> that doesn't exist. >>>> >>>> - Grant >>> >>> Situations like these that made me decide with great conviction to alwa= ys >>> deploy my servers virtualized, even if the box in question will only ho= st a >>> single VM. >>> >>> Now, if I lost my intelligence for a couple of seconds and somehow ende= d up >>> with a VM that's no longer accessible remotely, I just connect to the >>> virtual console. >>> >>> The flip side? Now I'm getting too daring/careless, and the uptime now >>> drops below my (self-imposed) target of 99.99% :-P >> >> What do you do when you need to upgrade the host, rather than the guest? >> > > I think setting up a VM on the server using the new kernel should help > test a new kernel? > > -- > Nilesh Govindarajan > http://nileshgr.com I haven't used a virtualized OS in awhile but the last time I did the hardware interacting with the virtualized OS was also virtualized and wasn't representative of the actual hardware. I don't think I can test the interaction between a kernel and my actual hardware from a virtual OS. - Grant