On Tue, 21 May 2013, Bill Nottingham wrote:
Matthew Miller (mattdm(a)fedoraproject.org) said:
>>> 2) I also commented out the "Zeroing out empty
>>> postinstall stuff, because it drastically increases the
>>> image build time for not much benefit, IMHO.
>> One time image build cost vs. whatever benefit multipled
>> by every time the image is used. :)
> To put some numbers behind it, the compressed qcow2 image with
the dd to
> zero empty space is 215M out of appliance-creator. Without it, it's 242M.
post install is the wrong place, agreed. Pre-build of an
image is not
There are privacy implications in not blanking a VM image.
In some LVM setups, one may pick up a previous image's slack
space still containing live data. A cautious provider does
not provide an image with anything worth trolling (trawling
What timing is seen running (pre install):
shred -n 0 -z /path/to/image
compared to that 'dd' approach quoted?
-- Russ herrold