On Tue, 21 May 2013, Bill Nottingham wrote:
Matthew Miller ([email protected]) said:
2) I also commented out the "Zeroing out empty space"
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
<?>) through
Matt,
What timing is seen running (pre install):
shred -n 0 -z /path/to/image
compared to that 'dd' approach quoted?
-- Russ herrold
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