OpenStack, Hacking, Community

Aug/01/2014

Kentaro Sasaki, Shuichiro Makigaki

Global Operations Department, Rakuten, Inc.

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• OpenStack Overview

• Issue and Hack it

• Community

• Development

Agenda

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100% OSS cloud management software:

• OpenStack project began in 2010.

• NASA Nebula -> Nova.

• Rackspace Cloud Files -> Swift.

All components are shared-nothing.

10 core components in Icehouse(2014.1)

OpenStack

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Shared-nothing component

Nova

(Compute)

Horizon

(Web UI)

Keystone

(Identity)

Glance

(Image)

Cinder

(Block Storage)

Neutron

(Networking)

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Nova architecture

REST API SQL

RPC

Decide compute node

Consolidate DB access

Each modular

components collaborate

with REST/RPC message.

nova-scheduler

nova-conductor

MySQL

RabbitMQ

nova-compute

nova-api Client

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Guiding Principles at Rakuten

Technology:

• Do not fork an OSS project w/o a good reason,

and contribute to that rather than creating

• Industry Best Practice

Functionality:

• Multi tenant portal for all services

• Auto Scaling to keep stability during peak traffic

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RIaaS – Rakuten Infrastructure as s Service:

• Original management tool (esp. SLB & DNS) > OpenStack

• Online migration of existing VMs on VMware

• Control VMware’s vNetwork Distributed Switch

Issue and Hack it

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e.g. Online migration of existing VMs

Control existing VMs on OpenStack

* “uuid” could not be updated because it has foreign key constraints.

Make VMs look like deploying by using OpenStack.

Run only

DB INSERT

at nova boot

UPDATE

nova’s DB

to be active

SELECT VM’s

instance_id

from vCenter

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def _create_instance(self, context, instance_type, """snip""" instances = self._provision_instances(context, instance_type, min_count, max_count, base_options, boot_meta, security_groups, block_device_mapping) """comment out from here to the end of this function""" # filter_properties = self._build_filter_properties(context, # scheduler_hints, forced_host, forced_node, instance_type) """snip""" return (instances, reservation_id)

Modify nova-api code #1

~/nova/compute/api.py: line 917

Reference: http://docs.openstack.org/developer/nova/devref/vmstates.html

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def _populate_instance_for_create(self, instance, image, index, security_groups, instance_type): """Build the beginning of a new instance.""" if not instance.obj_attr_is_set('uuid'): # Generate the instance_uuid here so we can use it # for additional setup before creating the DB entry. instance['uuid'] = str(uuid.uuid4())

{"server": { "min_count": 1, "flavorRef": "1", "name": "XXX", "imageRef": "YYY", "max_count": 1, "specific_uuid": "ZZZ",} }

Configure "specific_uuid" to instance['uuid']

~/nova/compute/api.py: line 1204

PUT method

Modify nova-api code #2

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UPDATE nova’s DB

vm_state -> active (=BUILD) task_state -> NULL (=scheduling) power_state -> 1 host -> nova-compute node launched_on -> nova-compute node node -> domain-cXX(VMware cluster_name) updated_at -> now() scheduled_at -> now() launched_at -> now()

We can control all of existing VMs on VMware!

instances table in nova DB

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Roles

Technical

committee

Program

Leads (PTLs)

Active Program

Contributors (APCs)

Active Technical Contributors

(ATCs)

• Define OpenStack Programs

• Manage day-to-day operations

• Drive the program goals

• Resolve technical disputes

• Voters for a given program PTL

• Subset of the Foundation Individual Member

• Committed a change over the last two 6-month

• Candidacy for the corresponding program PTL election.

• TC seats are elected by ATC

• Same as APC

• Bug triagers, technical documentation writers, etc can

exceptionally apply for ATC

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Communication

Mailing list: https://wiki.openstack.org/wiki/Mailing_Lists

• Question, Discussion, Announce, …

IRC: https://wiki.openstack.org/wiki/IRC

• Question, Discussion, Code review request, Meeting (weekly), …

• IRC is important place for decision making (Midnight in Japan…)

Others:

• Ticket comment (Launchpad)

• Code review comment (Gerrit)

• QA: https://ask.openstack.org/en/questions/

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Atmosphere

Be kind, honest, correct, detailed, organized and professional.

Full support for new contributors:

Upstream Training (Official contribution training)

Improve your presence in the community:

• Mails, ticket comments, reviewing patches, joining meeting, …

• Your patch can be reviewed quickly.

• Communication on IRC is important. (Patch review request, etc)

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Source code

Official git repository: http://git.openstack.org/cgit • Github mirror: https://github.com/openstack (pull

requests and issues are ignored.)

Python, bash, HTML, JavaScript: • Clean (pep8 is needed.)

• But, lack of comments and code document

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Bug, new feature

Launchpad:

https://launchpad.net/openstack

Bug -> bugs

New feature -> blueprints

Question -> answers

Github issue is ignored.

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Code review

Gerrit Review system:

• Open source code review system

• Used for CI, implementation discussion

Github pull request is ignored.

Patch can be discussed in Launchpad

and mailing list, but must be reviewed

and pass tests to merge.

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E-mail, Launchpad or Gerrit?

Question -> Mailing Lists

Bug discussion -> Launchpad

Implementation discussion -> Gerrit

Importance: pushing patch > launchpad discussion

Actual codes are always justice :-)

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Test, CI

Jenkins:

• CI runs every time automatically

when the patch is pushed.

• The result is commented the

review request, and you can see

test logs.

• Tests are also developed in the

community. (means there may be

bugs in tests!)

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Code review process

Patch must be

reviewed in Gerrit.

Patch must passed

all tests.

Patch must be

reviewed by core

reviewers.

Patch must be

approved by core

developers.

• test fail? fix your code, and push it again.

• test fail?? the test is "valid" test? Check test bug.

• test fail??? Cosmic ray or lack of your luck.

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Community review

Common review checklist: https://wiki.openstack.org/wiki/ReviewChecklist

Everyone can do it: +/- 1 (this can get attentions of core reviewers)

Core reviewer can do it: +/- 2 (two "+2" are required to merge)

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Activity visualization Contribution visualization:

Stackalytics (http://stackalytics.com/)

Activity visualization:

http://activity.openstack.org/

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Activity besides OpenStack itself

Code contribution:

• Common library: oslo (messaging, DB, config paser, i18n, …)

https://wiki.openstack.org/wiki/Oslo

• Git subcommand for gerrit: git-review

https://wiki.openstack.org/wiki/Gerrit_Workflow#Git_Review_Installation

Summit:

Meetup, Conference, Design discussion

https://www.openstack.org/summit/

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Thank you