Date: Fri, 23 Mar 2018 08:55:34 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: =?UTF-8?Q?Kamila_Sou=C4=8Dkov=C3=A1?= <kamila@ksp.sk> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Easiest way to get a small VM disk image? Message-ID: <201803231555.w2NFtYqw031888@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <CAO7yDHrMqj%2B2r23zaHRP9YyvX9DBmV5WnpOFZGf2NtayQ%2BAc-Q@mail.gmail.com>
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> Hello, > > I want to build an OpenNebula[1]-compatible VM image of FreeBSD 11.1. One > requirement for my use case is that the image should initially be small > (not as in "take up little physical space", but as in "the size of the > virtual disk as visible in the VM should be small". Specifically, I want > the virtual disk size to be no more than 3GB (which should not be a > problem, as the default installation of FreeBSD takes a lot less than 3G). > > The VM images available in the official downloads have a virtual size of > 20GB. Therefore I need to somehow build my own image (or shrink the > existing ones). Here are the approaches I have thought about: > > - Create and partition an empty disk image, rsync the contents of the > official image into it. Problems: AFAIK requires a FreeBSD host to build > (in order to be able to create a UFS filesystem); requires juggling around > with loopback mounts and such. Probably still the most feasible option, but > I am not sure, which is why I'm asking. > - Create an empty image, boot it in a VM and install from an installation > ISO. Problem: not sure how to automate; might not get 1:1 parity with the > official VM image > - Somehow shrink the existing image. Problem: How? > - Find out how the official images are built and do that with a smaller > size. This is where this list comes in :-) > > Which (of these, or any other) is the easiest way to get a small image? > > Thanks a lot! Thought it still requires a FreeBSD host to do, somethink along the lines of: truncate -s 2G NEW_FreeBSD_vm_image mdconfig -f OFFICIAL_FreeBSD_vm_image -u 100 mdconfig -f NEW_FreeBSD_vm_image -u 101 #You have to fdisk, bsdlabale and newfs /dev/md101 here to your needs mkdir /tmp/output mount /dev/md101s1 /tmp/output cd /tmp/output dump 0Bf 2000000 - /dev/md100s1 | restore rf - && rm restoresymtable This was hand written here in vi, so probably has lots of sharp edges. -- Rod Grimes rgrimes@freebsd.org
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