The DevOps model is rapidly transforming IT operations and development practices. But what are the precursors necessary to implement DevOps? To achieve an agile, virtualized, and highly automated IT environment, what technological requirements need to be in place? OpenStack has the potential to facilitate DevOps implementation and practices at several different layers in the data center. In this session we'll quickly discuss what DevOps is, then discuss many components that are logically required to move towards DevOps in your environment. Finally we'll explore in depth several ways OpenStack can provide these baseline components. Watch the DevNet 1104 replay from the Cisco Live On-Demand Library at: https://www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=92695&backBtn=true Check out more and register for Cisco DevNet: http://ow.ly/jCNV3030OfS

1. OpenStack Enabling DevOps
Shannon McFarland – CCIE #5245
Distinguished Engineer
@eyepv6
DEVNET-1104

2. • Introduction
• DevOps
• OpenStack
• Virtualization
• CI/CD Pipeline
• Orchestration
• Conclusion
Agenda

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What is DevOps?
• Practice that emphasizes the
collaboration between developers, QA
and Technical Operations
• As much an organizational process as it
is technical
• Focused on automating the build, test
and deployment of software
• Aims to release better tested software
more frequently
• Blurs the line between traditional
developers and IT Operations
DevOps
Dev /
SW Eng QA
Technology
Operations
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OpenStack
• Open Source platform for cloud computing that controls
large pools of compute, storage and networking
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OpenStack
• Provides APIs to all features and functionality
• Compute (Nova)
• Storage – Cinder (block), Swift (Object), Glance (images)
• Networking (Neutron)
• Includes complex concepts – firewalls, VPN, etc.
• Supports many flavors of networking – VLAN, VXLAN,
provider networks, etc.
• Floating IP to map private IP space to public
• Encourages DevOps model but doesn’t require it
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Why Virtualization?
Traditional approach:
• Group of developers start coding on their laptops
• Transition to a HW that has been allocated at project start and may or may not
match requirements
• Long lead time to get new/different hardware
• Hardware upgrade and updates are cumbersome and slow
• Low utilization on dedicated hardware (5-15% is common)
Virtualization allows allocation of physical hardware to multiple projects
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Virtualization using OpenStack
IT Team
• Deploys an OpenStack cloud
• Focuses on deploying standard
hardware and enforcing policy
Development Team
• Get authorized to use cloud
• Starts new VMs as necessary
(typically start by using GUI, quickly
migrate to using APIs)
• Focuses on delivering enhanced
functionality, not filling out paperwork
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Virtualization using OpenStack
Once IT cloud is in place:
• Encourages experimentation via less commitment to hardware
• Offloads both teams – developers don’t spend time configuring hardware, IT
focuses on overall utilization of standardized hardware
• Next step is automation
• Encouraging development to automate makes it easier to enforce policy as it decreases
their work & increases consistency
• Automation progresses into continuous deployment –> on commit, software is deployed
and tested resulting in instantaneous feedback
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Revision
Control
System
Code
Review Tool
Code Repo
Test Jobs
Integration
Server
• RCS: Subversion,
Mercurial, CVS, Bazaar,
Perforce, ClearCase,
etc..
• Code Review: Gerrit, Git
pull request, Phabricator,
Barkeep, Gitlab, etc..
• Code Repo: GitHub,
BitBucket, BitKeeper,
Gitorious, etc..
• Integration Server:
Jenkins/Hudson, Zuul,
CloudBees, Go, Maven,
etc..
• Test Jobs: Tempest,
Rally, puppet-rspec, tox,
etc..
• Artifacts: rpmbuild,
Jenkins, Artifactory,
Apache Archiva, etc..
(Gerrit/Git pull request)
*See notes for logo credits
(Tempest/Rally/etc)
Continuous Integration/Deployment
(GitHub)
Artifact Creation
Artifact Rep Mgr
Deployment
Jobs
(rpmbuild/Jenkins/etc)
Continuous
Deployment
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CI/CD Pipeline to Increase Velocity
• Every commit triggers a build (automated, nothing manual)
• Every build is automatically tested
• Responsible people are notified when things fail
• Everyone sees what’s happening
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CI/CD Principles
• The process must be repeatable and reliable
• Automate everything (DevOps!)
• If something is painful or difficult or large, do it more often and break it down into
smaller jobs
• Everything is in source control
• Done means “released”
• Build quality in (reviews and automated testing)
• Everyone has responsibility for the release process
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CI/CD on OpenStack
• OpenStack can provide the basis for a CI/CD system
• Cleanly supports dynamic allocation and build of system
• Good cloud application – on commit, new infra is spun up that is a scaled
version of the target environment, software is deployed and automatically tested;
results reported back to standard dashboard
• Target scale can be anything from small to very large, with high degree of
confidence in final deployment
• There’s still a problem: how do you orchestrate the bring up of multiple VMs with
complex networking?
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Automating Deployment of Applications (Heat)
• Challenge: How do I orchestrate the deployment of a complex application?
• Solution: OpenStack Heat
• Template based description of applications
• Can deploy multiple composite cloud applications
• Templates describe servers (VMs), floating IPs, security groups, storage,
users, etc.
• Templates also describe relationships between resources (volume X is
connected to server Y)
• Easy to read (text files), easy to audit for compliance
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heat_template_version: 2015-10-15
parameters:
image:
type: string
description: Name of image to use for servers
default: ecb42067-f5f5-4a9c-888f-0559fdf6c11b
flavor:
type: string
description: Flavor to use for servers
default: Demo
private_net_name:
type: string
description: Name of private network to be created
default: test_net
private_net_cidr:
type: string
description: Private network address (CIDR notation)
default: 10.10.30.0/24
. . .
resources:
private_net:
type: OS::Neutron::Net
properties:
name: { get_param: private_net_name }
private_subnet:
type: OS::Neutron::Subnet
properties:
network: { get_resource: private_net }
cidr: { get_param: private_net_cidr }
Heat Template
• JSON/YAML
• Parameters
• Resources
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Conclusion
• OpenStack provides a solid platform for hosting applications
• OpenStack provides APIs to access the infrastructure, encouraging DevOps
practices
• CI/CD on OpenStack is a natural fit (and encourages good practices)
• OpenStack Heat can be used to describe and deploy entire applications –
especially powerful when tied to other automation tools such as Ansible
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16. Q & A

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