From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joseph Wolff Subject: Stacked disks Date: Sun, 02 Sep 2007 11:51:26 -0700 Message-ID: <46DB062E.5070004@osdf.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Hello, I would like to set up stacked disk images as follows: 1) Base-image of Ubuntu, with ubuntu-minimal installed. 2) Multiple other images all based on the single image above, with various single-purpose packages installed; eg Apache, Exim, etc. Now, comes the hard part: Q2: What happens if I change the underlying ubuntu-minimal image (For a good example, to apply security updates), while several of the other "upper" images (Apache Exim, etc) are running? Q1: Easier: If everything is down, can I change the underlying image and will the changes be properly reflected in the "upper" (dependent) images? I see problems with simply a file-based algorithm which looks first in the upper image, and then in the base image.. It's really a reconciliation problem.. FYI: I was a KVM forum attendee; I'm building a hosting infrastructure based on KVM, and so clearly saving / consolidating space & updates such as in the example above is of keen interest to me. And Thanks again to the Qumranet team for an informative and successful conference! Thanks, Joe ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/