OpenStack in 10 minutes with Devstack

© Copyright 2014 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.

OpenStack in 10 minuteswith DevStackSean Dague / Aug 20th, 2014Twitter: @sdagueBlog: dague.net

© Copyright 2014 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.2

OpenStack – A Constellation of IaaS Services

Nova

GlanceSwift CinderCinder Neutron

Horizon

KeystoneCeilometer

Heat

Sahara

Trove


Installing OpenStack from Source

● Project Git Trees: 30 - 40● Python Dependencies: 50 – 100● Linux Distro Dependencies: > 100● Databases: 5 – 10● Configuration Changes to System: … a lot

Not a Journey for the faint of heart


● Written in Bash● Prompts for 5 passwords● Sane defaults for all else● Supports latest master +

supported stable branches● Core part of OpenStack's

testing infrastructure● Core part of OpenStack

developer workflow

© Copyright 2014 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.5 Let's kick off a DevStack run...


What DevStack Does

● Installing all prereq software via packages or pip● Installing all OpenStack software via git to latest master● Configuring and installing working database schema● Configuring hypervisor, storage backends, networks● Creating service ids and service catalog entries to connect all components● Starting all OpenStack services under screen (for easy hot fix)● Creating Apache configuration for web dashboard available at 127.0.0.1● Creates working Tempest config in /opt/stack/tempest

WARNING: DevStack will massively modify your OS. Do not run on a laptop.


OpenStack as Layers (Compute Centric View)

Layer 1: Base Compute Infrastructure

Layer 2: Extended Infrastructure

Layer 3: Optional Enhancements

Layer 4: Consumption Services

Nova Glance Keystone

Ceilometer Horizon

Heat Trove Sahara

Ironic

Barbican

Marconi

Compute Image

Bare Metal

Neutron DesignateNetworking DNS

Cinder SwiftObjectBlock

Storage Services Compute ServicesNetwork Services

Identity

Telemetry Dashboard Key Management

Orchestration Database Hadoop Queues

Integrated

Incubated

http://hackstack.org/x/blog/2013/09/05/openstack-seven-layer-dip-as-a-service/


Alternate Compositions





Nova Glance

Ceilometer Horizon

Heat Trove Sahara

Ironic

Barbican

Marconi

Compute Image

Bare Metal


SwiftObject




KeystoneIdentity

CinderBlock


OpenStack Services – Management Glue

● OpenStack Services as Management Plane● Example: Keystone – Identity Services

– Provides REST API over existing auth systems

– Generates Tokens (with expiration) for User + Action in OpenStack Cloud

– Additional Metadata / Grouping for cloud operations

– Service Catalog to be able to discover all OpenStack end points beyond Keystone


Queue Pattern in OpenStack (Creating a Compute Server)

Nova API Keystone Nova Sched Nova ComputeGlance Nova Conductor

Database interactionREST interactionRPC (AMQP) interaction


Watching it in Real Time


Hacking with DevStack

● Edit code in /opt/stack– Be careful about devstack overwriting things, safer to use local branches

● Connect to screen: screen -rd stack● Find service you want restarted

– Ctrl-C

– Up Arrow

– Enter

● Voila! Your changes are now running.


Customizing DevStack further – when the defaults aren't enough

ADMIN_PASSWORD=0penstackAPI_RATE_LIMIT=FalseLOGDAYS=1LOGFILE=$DEST/logs/stack.sh.logMYSQL_PASSWORD=superstackRABBIT_HOST=localhostRABBIT_PASSWORD=superstackSCREEN_LOGDIR=$DEST/logs/screenSCREEN_NAME=${SCREEN_NAME:-stack}SERVICE_PASSWORD=$ADMIN_PASSWORDSERVICE_TOKEN=cd0d1a03-b701-4fcb-801a-8b4d0bc3d06eSTACK_LOG=stack.sh.logVOLUME_BACKING_FILE_SIZE=10000MHEAT_CFN_IMAGE_URL=""enable_service s-account s-container s-object s-proxySWIFT_HASH=8213897fads879789asdf789SWIFT_REPLICAS=1

devstack/localrc – basic devstack configuration


Devstack Defaults





Ceilometer

Trove Sahara

Ironic

Barbican

Marconi

Bare Metal


SwiftObject


Telemetry Key Management

Database Hadoop Queues

KeystoneIdentity

CinderBlock

HeatOrchestration

HorizonDashboard

Nova GlanceCompute Image


And if you need more specifics – local.conf

[[local|localrc]]DATABASE_PASSWORD=passRABBIT_PASSWORD=passSERVICE_TOKEN=passSERVICE_PASSWORD=passADMIN_PASSWORD=passMULTI_HOST="True"API_RATE_LIMIT="False"RECLONE="True"LOGFILE=/opt/stack/logs/stack.sh.logVERBOSE=TrueLOG_COLOR=TrueSCREEN_LOGDIR=/opt/stack/logs

[[post-config|$NOVA_CONF]][DEFAULT]flat_interface = eth1vlan_interface = eth1

Pass through variables


Caveat Developer

● 4G memory recommended– 8G VMs used in OpenStack testing

● Can run in a VM– 2nd Level guests will be slow, but cirros works ok

● Be extremely careful with changes in /opt/stack● Does not reclone git trees by default● If all else goes wrong... ./clean.sh should fix it


DevStack doesn't support my particular desired config, what do I do?

● A good change to DevStack– Generally useful configs

– Not just pass through variables that could be specified via local.conf

– Fits current architecture

● Reviewed through review.openstack.org– Small review team, please be patient

– Small patches much better than large ones

– Questions can be asked on #openstack-qa on freenode.net


Related Projects

● openstack-dev/devstack-vagrant– Vagrant configuration to make DevStack deployment into a VM even easier

● openstack-dev/grenade– Upgrade testing for OpenStack that consumes devstack as a library

● openstack-infra/devstack-gate– Setup tool for building the devstack based configurations we test with in OpenStack

● openstack-dev/bashate– bash style enforcement tool (inspired by pep8) used by bash projects in OpenStack


Thanks!





Nova Glance Keystone

Ceilometer Horizon

Heat Trove Sahara

Ironic

Barbican

Marconi

Compute Image

Bare Metal


Cinder SwiftObjectBlock


Identity



Integrated

Incubated

http://hackstack.org/x/blog/2013/09/05/openstack-seven-layer-dip-as-a-service/

Questions?

Date post:	15-Jan-2015
Category:	Software
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OpenStack in 10 minutes with Devstack

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