openstack enabling devops

OpenStack Enabling DevOpsShannon McFarland – CCIE #5245

Distinguished Engineer

@eyepv6DEVNET-1104

© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Public

• Introduction• DevOps• OpenStack• Virtualization• CI/CD Pipeline• Orchestration • Conclusion

Agenda

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© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Public 3

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 Write code to control infrastructure

DevOps

Dev /SW Eng QA

TechnologyOperations

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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 JobsIntegration 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 CreationArtifact Rep Mgr

Deployment Jobs

(rpmbuild/Jenkins/etc)

ContinuousDeployment

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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: 2015-10-15parameters: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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Q & A

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