OpenShift Commons Briefing: Ask Me Anything about Cinder and Glance

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Ask Me Anything!
Cinder and Glance
Overview and Update
Brian Rosmaita
Senior Software Engineer

What we’ll
discuss today
▸ Cinder
▸ Cinder drivers
▸ OpenShift
▸ cinder-csi
▸ ember-csi
▸ AMA
▸ OpenStack
▸ OpenStack
development
▸ Red Hat OSP
▸ Sausage making
▸ Glance
Agenda
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Why should you care about Cinder and Glance?
Cinder and Glance
… are core components of OpenStack
Openstack
… is the basis of Red Hat OpenStack Platform
Red Hat OpenStack Platform
… can run OpenShift in a "Shift on Stack" configuration
Red Hat OpenShift
… is why there are OpenShift Commons briefings
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Let's talk about …
OpenStack

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OpenStack is an open source project for building a private or public
infrastructure-as-a-service cloud running on standard hardware
▸ Uses virtualized resources to build a cloud
▸ Relies on virtualization software
▸ Relies on a base operating system
▸ more info: openstack . org

Five "essential characteristics"
▸ on-demand self-service
▸ broad network access
▸ resource pooling ("multitenancy")
▸ rapid elasticity
▸ measured service
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NIST special publication 800-145
What is a cloud?

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The OpenStack architecture is a number of projects that provide
different cloud services via REST APIs.
▸ Compute Service - Nova
▸ Networking Service -
Neutron
▸ Image Service - Glance
▸ Block Storage Service - Cinder
▸ Identity Service - Keystone
▸ Object Store - Swift

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The OpenStack architecture is a number of projects that provide
different cloud services via REST APIs.
▸ There are more projects than "the dirty six"
▸ duckduckgo: openstack api reference

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Developers contribute code by posting a gerrit review to the appropriate
project.
How code gets into OpenStack

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Developers contribute code by posting a gerrit review to the appropriate
project.
▸ review . opendev . org / 730183

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Design work is done the same way.
▸ Features are proposed as "specs" that are ReST documents that are
posted in gerrit and reviewed by the project community
▸ example: review . opendev . org / 733555
･ "Default volume type overrides"
･ Is it bikeshedding? (I don't think so!)
▸ duckduckgo: openstack specs

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Each patch goes through:
▸ an initial "check" by the Zuul CI system
▸ code reviews by other contributors
▸ revisions and approval
▸ the Zuul "gate"

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The gate is different from the check.
▸ takes into account other patches for other
projects that are also being submitted
▸ you don't want to test a patch for Cinder
against Nova and Glance the way they are
right now, because when the Cinder patch is
merged, Nova and Glance may be different
from what was tested against
▸ zuul . openstack . org

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Red Hat
OpenStack Platform

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You don't want OpenStack … what you want is OpenStack plus
virtualization plus an operating system, and you would like it in an
easy-to-install package.
▸ It's not enough for the OpenStack code to be solid, it must integrate
well with the all the other OpenStack components and the
virtualization and operating system layers
▸ Red Hat OpenStack Platform is a distribution of OpenStack that is
appropriately packaged and tested to work with RHEL.
That's all very nice, but ...

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From code to cloud
Making the sausage

▸ rdoproject . org
▸ a community distribution of OpenStack
▸ deploys a cloud using Triple-O ("OpenStack on
OpenStack", another OpenStack project)
･ provides an OpenStack undercloud that an
operator uses to deploy an overcloud, which is
the environment that cloud users interact with
▸ packaged in RPMs and tested on CentOS
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RPM Distribution of OpenStack
RDO

▸ an enterprise-grade distribution of OpenStack
▸ packaged for RHEL
▸ tested - both automated testing and manual testing of
key features
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Finally!
Red Hat OSP

▸ built on the OpenStack Train release
▸ 16.0 released 6 Feb 2020 (RHEL 8.1)
▸ 16.1.0 beta on 27 May 2020 (RHEL 8.2)
･ GA real soon - probably within a week or so
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Current Release
Red Hat OSP 16

▸ October 19-23, 2020
▸ will be held virtually … and there is no cost to attend!
▸ to register: openstack . org / summit /2020
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Open Infrastructure Summit (Berlin 2020)

▸ This is where the design discussions for the Wallaby
release take place
▸ around the week of October 19-23, 2020
▸ will be held virtually
▸ probably no cost to attend?
▸ watch: openstack . org / ptg
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OpenStack PTG (Berlin 2020)

▸ 16.0 released 6 Feb 2020 (RHEL 8.1)
▸ 16.1.0 beta on 27 May 2020 (RHEL 8.2)
･ GA real soon - probably within a week or so
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Current Release
Red Hat OSP 16

Upstream OpenStack Releases
cadence: release every 6 months
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The Ussuri River has a reputation for
catastrophic floods.
13 May 2020
VictoriaUssuri
We are not amused.
14 October 2020
Train
Planning was done in Denver at a hotel
with a remarkably loud train outside.
16 October 2019

OpenStack is a coordinated release of a set of
deliverables, each of which has its own version number, so
a release is referred to by its name. For Train:
▸ Nova: version 20.0.0
▸ Glance: version 19.0.0
▸ Cinder: version 15.0.0
▸ Red Hat OSP: version 16
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… is very confusing
OpenStack Versioning

▸ is a Long Life Release
▸ current plan is no more short-term releases
▸ future 16 versions may contain some U or V features
▸ want to keep OSP in closer sync with RHEL
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Current Release
Red Hat OSP 16

▸ Train is the last OpenStack release to support Python 2.7
▸ RH OSP 16 only supports RHEL 8
▸ The default, fully supported version of Python in RHEL 8
is Python 3.6
▸ So RH OSP only supports running on Python 3.6
▸ Upstream
･ Ussuri: Python 3 only (3.6 and 3.7)
･ Victoria: Python 3.6 and 3.8
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Python Version
Red Hat OSP 16

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Glance

▸ Provides services and associated libraries to store,
browse, share, distribute, and manage bootable disk
images, other data closely associated with initializing
compute resources … and metadata definitions.
▸ docs: glance . openstack . org
▸ code: opendev . org / openstack / glance
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The OpenStack Image Service
OpenStack Glance

▸ Interoperable image import
･ allows plugins to process uploaded image data
▸ multiple stores
▸ enhancements for DCN ("edge") deployments
･ ability to move image data closer to where it will
be used
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Recent Developments
OpenStack Glance

▸ Project Team Leader is Abhishek Kekane (Red Hat)
▸ 75% of the core team is from Red Hat
▸ To contribute: glance . openstack . org
･ look for "Glance Contribution Guidelines"
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Community
OpenStack Glance

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Cinder

▸ Implements services and libraries to provide on
demand, self-service access to Block Storage
resources.
▸ Provides Software Defined Block Storage via
abstraction and automation on top of various
traditional backend block storage devices.
▸ docs: cinder . openstack . org
▸ code: opendev . org / openstack / cinder
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The OpenStack Block Storage Service
OpenStack Cinder

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General Architecture
OpenStack Cinder

▸ There are over 70 drivers in the cinder code repository
▸ Drivers mediate between the Block Storage API, which
provides a consistent interface to users, and particular
storage backends
▸ 'Supported' drivers have functioning third-party CI
systems that run on every patch proposed to cinder
▸ The 3rd party CI provides additional information when
patches are reviewed
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About the Drivers
OpenStack Cinder

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Cinder Third Party CI
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

▸ The 3rd party CI run the OpenStack integration test
suite ("tempest") plus additional cinder-focused API
and scenario tests contained in the
cinder-tempest-plugin
▸ We can add extra integration tests for drivers to focus
on particular areas of functionality for particular
configurations
▸ example: review . opendev . org / 737380
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About the Drivers
OpenStack Cinder

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Cinder
and OpenShift

▸ Specifies an interface to enable a storage vendor to
develop a single plugin that will work across all
container systems supporting the standard
▸ Storage vendors do not have to touch the core code
of the container orchestration system
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Container Storage Interface

▸ When running OpenShift in a Shift on Stack
configuration, Cinder is available via the
cinder-csi-plugin
▸ Whatever storage backends an operator configures
for Cinder can be used to serve persistent volumes in
OpenShift
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Cinder and CSI

▸ What about when not running OpenShift on top of
OpenStack?
▸ Cinder can be run in "standalone" mode (OpenSDS
takes this approach)
▸ Gives you a wide choice of backends, but is very
heavyweight
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Cinder and CSI

▸ a Python library that allows cinder storage drivers to
be used outside of cinder
▸ a deliverable of the OpenStack Cinder project
▸ removes the DBMS, message broker, Block Storage
API, scheduler, and volume manager layers
▸ cinderlib 2.0.0 was released last week
･ code: opendev.org / openstack / cinderlib
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cinderlib

▸ Allows you to take advantage of all the tested driver
code from cinder
▸ Allows vendors to re-use the driver code they have
developed for cinder
･ Hitachi and Dell/EMC have added new drivers
for the Victoria release
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cinderlib

▸ Allows you to take advantage of all the tested driver
code from cinder
▸ Allows vendors to re-use the driver code they have
developed for cinder
･ Hitachi and Dell/EMC have added new drivers
for the Victoria release
▸ ember-csi . io
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Ember CSI

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twitter.com/RedHat
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open source software solutions. Award-winning support,
training, and consulting services make Red Hat a trusted
adviser to the Fortune 500.
Thank you

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and now …
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OpenShift Commons Briefing: Ask Me Anything about Cinder and Glance

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