[openstack-dev] [kolla] image bloat
robertc at robertcollins.net
Fri Jul 17 03:59:54 UTC 2015
On 17 July 2015 at 15:49, Steven Dake (stdake) <stdake at cisco.com> wrote:
> From: Robert Collins <robertc at robertcollins.net>
> Reply-To: "OpenStack Development Mailing List (not for usage questions)"
> <openstack-dev at lists.openstack.org>
> Date: Thursday, July 16, 2015 at 6:48 PM
> To: OpenStack Development Mailing List <openstack-dev at lists.openstack.org>
> Subject: Re: [openstack-dev] [kolla] image bloat
> We don’t use pip during deployment as it results in an uncontrolled
> deployment mechanism. Instead we pre-build containers and rely on an atomic
> deployment (either the container deploys or doesn’t, vs using pip during
> deployment, where some could fail and some could succeed). Pre-building is
> more deterministic, but images must be build.
sure- I wasn't suggesting a change to install-at-deploy [you know my
views on deploys better than that!].
> Using pip is slower then yum when installing packages. Most of this has to
> do with invocation of the c compiler for various modules (lxml is an example
> that takes awhile).
With the wheel cache introduced in 7.0.3, you may find that that has
changed [particularly if the build environment can map in a persistent
cache rather than having to start one in the lowest Docker layer].
Installing all the dependencies of OpenStack via pip (including the
cold [but not empty] cache:
time pip install -r global-requirements.txt
E.g. nearly all the time difference was network latency, revalidating
or downloading index data.
> What I actually proposed in the above email was getting rid of our common
> dependency layer where yum is only used one time during the build. This
> would be replaced by using yum for each container (* 40 or so containers
> *100 or so dependencies). We already do this for from-source, but not
> from-binary container building.
Ah ok, I understand now - thanks!
Robert Collins <rbtcollins at hp.com>
HP Converged Cloud
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