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[openstack-dev] [Ironic] Updates from the Summit

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Hello!

It's that time - hopefully everyone has recovered from the summit by
now and is getting back in the swing of things.

I'd like to take a little of everyone's time to summarize the main
points we covered while in Vancouver (and record them here for folks
who didn't make it, were in other sessions, etc).

Release Cycle


There's a lot of interest in switching from the 6mo release cycle to
an independent release cycle. I've started a discussion on that. [1]

Networking


This was probably the biggest and most consistent theme -- neutron
integration to allow for separation of provisioning & tenant networks,
and for tenant network isolation, at the physical switch layer, needs
to be completed. Several companies have done POCs, but we need to move
this into the main code.

Sukhdev has offered to lead this work, and has set up a cross-project
meeting to kick it off. [2] I'd say, this is our highest priority this
cycle.

tldr; we'll need to do some work in both the Nova driver and in Ironic
-- but mostly in Ironic -- to change the sequence of Neutron calls,
and to pass additional information to Neutron. We will also need to
define & document the network metadata which Ironic owns (read: is the
source of truth) and supplies to Neutron.

Driver Matrix


We already knew that our driver list was getting out of hand and only
getting worse. So, we came up with a plan to address it.
- name each Driver after the type of hardware it manages (eg, drac,
ilo, amt, ...) rather than the combination of interfaces it implements
- allow dynamic loading/swapping of some interfaces (eg, deploy,
console) where appropriate for that driver, based on the node's
driver_info
- have sane and well tested defaults for each interface which can be exchanged

Why this approach? Because the unique thing about a given server is
the hardware interfaces required to managed it -- not the software
interfaces we might use to copy an image, start a console server, etc.

This will require some careful thought to ensure the config options as
well as the API options (eg, when enrolling a node) remain backwards
compatible.

Driver Interfaces


We'll be splitting part of the DeployInterface out into a new
BootInterface this cycle. This will facilitate the creation of drivers
that no-op deployment -- in other words, pure "boot from network" --
and also facilitate the simplification of the driver matrix mentioned
above.

Additionally, we will be promoting the "heartbeat" / "lookup" /
"passdeployinfo" methods, which are currently implemented in
VendorPassthru, to become a standard part of the Deploy() interface.
It turns out every deploy driver we've got implements this
functionality, and promoting common interfaces out of VendorPassthru
is one of the reasons that interface exists :)

Cinder integration


There are two things people mean when they say "cinder integration
with ironic": attach volumes, and boot from volumes.

Attaching iSCSI volumes to hardware is cool and most of the work is
already done -- but the cinder CLI commands to get the endpoint
weren't documented, so we didn't know. Also, we need some actor inside
the guest to attach and mount the volume. That could go into
cloud-init-v2, or an optional process that gets added to the machine
images. Without that actor, the user has to initiate the attach and
mount themselves -- which is fine, too, but again, the cinder CLI
command to get that endpoint wasn't documented, and a little work is
needed there.

For out-of-band attach (eg, FCoE) the Cinder API should be similar,
but we'll need to create an interface in Ironic to receive and act
upon that information (ie, pass it down to the hardware driver to
initiate the attachment).

For boot-from-volume, passing the iSCSI information to Ironic and
chain-loading iPXE from it is the most straight-forward way, but
should be delayed until after we refactor the Boot interface. Ditto
for boot-from-FCoE -- if we can delay this until the Boot interface is
refactored, then it merely becomes an option to that interface, rather
than a whole new DeployDriver.

State Machine


We designed more states than we were able to implement last cycle.
This cycle, we'll be adding the "enrolled" state and changing the
process for adding Nodes to Ironic to ensure they are manageable
before making them available to Nova.

We will also implement the "zapping" state, which is where long-lived
operations should take place (eg, flashing firmware or a slow-build of
a RAID array). If there's time, we'll also implement the "rescue"
state, though drafts of this appear to be dependent on the network
isolation work, so it may get bumped.

Better Onboarding & Operator docs


There were multiple discussions about the need to improve our
operator-focused "getting started" documentation. Yes. We know :)

I talked with the OpenStack Docs team, and we'll be working on a way
to syndicate / publish the documentation that we have today
(maintained in openstack/ironic/docs/) into the official doc website
while keeping the source of the docs in the current place.

As developers, we're not the best doc writers, but as developers and
reviewers, we've built a habit of proposing/requiring doc updates
along with code changes. Having the code and the operator docs in the
same repo has been helpful, and we'd like to keep it that way.

So - operators and tech writers - please don't be shy. We'd love your
help writing docs about Ironic, and we don't expect you to do
everything yourself.

Using Ironic outside of OpenStack


We had a lot of folks interested in using Ironic by itself, and to
that end, there are a few new projects showcased at the summit that
should facilitate this.

Bifrost [3] is usable at this point; I did a demo of it on my
presentation on Monday [4]. There's more work to be done here -- it is
not very configurable or dynamic yet -- but we will be setting up
functional testing for Ironic using Bifrost / Ansible, in addition to
our current devstack-based job(s).

Michael demo'd his browser-based JS UI for Ironic [5] -- it talks
directly from the browser to Ironic's REST API, and thus delivers a UI
for Ironic without running any additional server-side services. This
hasn't been proposed to the openstack/ namespace yet, though.

Both of these are fairly young projects, but I'd like to see more
projects be usable in their own right.

That's all for now!
-Devananda

[1] http://lists.openstack.org/pipermail/openstack-dev/2015-May/065036.html

[2] http://lists.openstack.org/pipermail/openstack-dev/2015-May/064953.html

[3] https://github.com/openstack/bifrost

[4] about 21 minutes into https://www.youtube.com/watch?v=C9-o1gLHHWo

[5] https://github.com/krotscheck/ironic-webclient


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asked May 28, 2015 in openstack-dev by Devananda_van_der_Ve (10,380 points)   2 4 7

1 Response

0 votes

Thanks for the summary Devananda. Lots of juicy features to sink our teeth
into :-)

There was a session with Nova, to discuss HA of nova compute nodes (and
Nova's resource model) as it pertains to Ironic. What does a potential
future look like?

--ruby


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responded Jun 1, 2015 by Ruby_Loo (4,000 points)   2 3
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