On 12/02/2015 11:01 AM, Brian C. Lane wrote:
On Wed, Dec 02, 2015 at 08:39:42AM -0600, Pat Riehecky wrote:
On 12/01/2015 07:23 PM, Brian C. Lane wrote:
I've been doing some experiments for bz#1283701, supporting running
docker at install time to pull down images without rebooting into the
system first. At first I thought it would be much harder than it is.
I've added docker and some support libraries to lorax, they only added
about 12M and that's before I've even looked at trying to trim them down
at all.
I have an experimental %post --nochroot that starts up docker, points to
the LVM thin pool (setup by kickstart, not docker-storage-setup), and
pulls down a couple simple images. It writes the config to the target
system and kills off docker. The only slightly odd part is bind mounting
/var/lib/docker to /mnt/sysimage/var/lib/docker so that everything it
writes ends up on the target system.
I propose turning the %post hack into some kickstart commands for
setting up the storage, pulling images, and doing whatever other normal
setup things are needed.
What do you think? Is this worth the extra 12M (or so) to add this?
I'll confess this sounds a bit more like orchestration than installation to
me.
That was my original thinking as well, I usually like setting up the
base system and then use something like ansible to do setup of the
services after rebooting. But not everyone works that way.
I see what you are getting at.
Would an anaconda addon make more sense? Technology changes and best
practices go obsolete. Putting this into an addon would (a) help
highlight the nifty anaconda addons API, (b) insulate anaconda a bit
from one specific container technology, and (c) help keep some level of
"orchestration" out of the raw installer.
Plus, in theory the %addon sections could be easily copied from one
kickstart file to another (like containers).
Thoughts?
Any chance for an example use case?
Setup of systems in a single pass instead of having to install, reboot,
apply configuration using ansible.
Also remember that anaconda can be used to create disk images, so this
can be used to make images with the required docker images already
installed and setup, and then those images can be deployed with
something like vagrant.
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