1. Devops Architecture
By Ojasvi Jagtap

2. Agenda
• Devops Introduction
• Devops Infrastructure
• Automation
• Devops Workflow with CI-CD-CD
• Devops Architecture
• Cost based analysis

3. Devops Introduction

4. Devops
• What is DevOps?
Devops = Automation + Continuous Improvement + Co-ordination
• Devops key work areas are,
- Infrastructure creation and management.
- Automation
- Workflow creation and maintenance
- Co-ordination between teams.

5. Continuous Improvement with Devops
Communicate/Co-
ordinate with
teams
Discover
bottlenecks/
improvement
areas /
Optimization areas
/ refinement scope
Fix and automate
discovered areas
Test automation
Integrate with
Devops workflow

6. Infrastructure

7. Devops Infrastructure
Organizations Infrastructure can be categorize into below three high level categories.
IT Infrastructure
• VCS (Git/Stash)
• JIRA
• Code review Tool (Gerrit)
• Repository
Manager(Artifactory)
• Authentication
Management
server(LDAP)
• Database
• ……..
Build Infrastructure
• Platform build servers
• Servers to run code
coverage/ test
frameworks which needs
access to source code.
• ……
Test Infrastructure
• Deployment test
• Acceptance test
• Sanity test
• Functional test
• …..

8. GIT
Jira
Code Review
Tool
Production
staging area
Artifactory
I
T
I
N
F
R
A
An IT Infrastructure should have
 High Security ( Has sensitive data
– > Source code + org data)
 100% Uptime
 High availability
 High Performance
 More robust
An IT Infrastructure is
recommended to be hosted
(Considering high data sensitivity)
 On Premise ( Procure/lease
H/W) virtualized machines.
 On Private Cloud
On premise Infra Setup

9. Build Servers
Test servers
having
source code
B
U
I
L
D
I
N
F
R
A
Build Infrastructure should have
 High Security (It host source code)
 High Performance
 Easily Reproducible
 Highly available
 High uptime
 More robust
 Less complex
Build Infrastructure can be
 Created run time dynamically
(Devops says “Treat your
infrastructure as a code”)
 Or Assigned Dedicated VMs
(Traditional Approach - Fixed
infa)
On Premise + Private Cloud containerized Infra Setup
Build Infrastructure
recommended to host
 On Premise ( Procure/lease
H/W) virtualized machines.
 On Private Cloud
 And use containerization
Configuration management tools

10. Test Servers (Sanity/Functional,
Acceptance etc )
Test deployment platform
T
E
S
T
I
N
F
R
A
Test Infrastructure has
 Less security issue (does not host
source code)
 High Performance
 Easily Reproducible
 Highly available
 High uptime
 More robust
 Less complex
Test Infrastructure can be
 Created run time dynamically
(On Demand infra,
infrastructure as a code)
 Assigned Dedicated VMs
(Fixed infa)
On Cloud containerized Infra Setup
Test Infrastructure
recommended to host
 On Public Cloud
 Use containerization
 Use cloud platforms
Configuration management tools

11. Infrastructure Hosting

12. On Premise Infrastructure (Virtualization)
Hypervisors like VMware, HyperV, KVM, Xen etc.
Market Share
• Magic Quadrant
• Figure 1. Magic Quadrant for x86 Server Virtualization Infrastructure
• Source: Gartner (August 2016)

13. Cloud Services (IaaS)
Cloud Providers like Amazon Web Services (AWS), Windows Azure, Google Compute Engine, Rackspace Open
Cloud, and IBM SmartCloud Enterprise etc
Market Share
• Magic Quadrant
• Figure 1. Magic Quadrant for Cloud Infrastructure as a Service, Worldwide
• Source: Gartner (August 2016)
Costing Sample

14. Automation

15. Automation
Success rate of Devops is highly depend on the automation percentage.
More you automate, more you go close to Devops….
1) Automated Infrastructure management.
2) Automated Builds.
3) Automated Tests.
(Unit test, Coverage test, Functional test, Sanity tests etc)
4) Automated Deployment.

16. Workflow

17. Devops Workflows
Continuous Integration
Continuous Delivery
Continuous Deployment

18. Continuous Integration (CI)

19. What is Continuous Integration
“Continuous Integration is a software development practice where members of a
team integrate their work frequently, usually each person integrates at least daily -
leading to multiple integrations per day. Each integration is verified by an
automated build (including test) to detect integration errors as quickly as possible “
-Martin Fowler

20. Why Continuous Integration?
• Make the whole process from check-in to release more efficient
• Automate more, shorten development cycle, release faster!
• Quickly identify check-ins that break builds or cause unit test failures
• Find more defects early in the software cycle
• Finding and fixing defects early and quickly is inexpensive in the long
run
• Debugging and investigating defects later on takes time and resources
that could otherwise be used on new development

21. Why Jenkins ?
 Its free open source system.
 Jenkins is a highly configurable.
 Supported by over 400 plugins - SCM, Testing, Notifications, Reporting, Artifact Saving,
Triggers, External Integration, Jenkins administration.
 There is a large support community and thorough documentation.
 There are additional development communities which are providing more support and
flexibility to Jenkins.
 It’s easy to write plugins
 You can fix, if you find anything wrong with Jenkins.
 Jenkins work very well with build tools like Ant, Maven, and Gradle etc.
 Using different means you can communicate with Jenkins.
Web based GUI
Command line interface
Rest API
 You can also get help from third-party vendors to run your Jenkins. They offers extra
features to manage your Jenkins. They also provides cloud-based solutions to run a Jenkins
instance
Cloudbees - http://www.cloudbees.com/
ShiningPanda - https://www.shiningpanda.com/
CI Tools
• Jenkins
• Teamcity
• Travis
• Bamboo
• Circle CI

22. Continuous Delivery (CD)

23. What is Continuous Delivery
• Continuous Delivery (CD) is the natural extension of Continuous Integration: an approach in which
teams ensure that every change to the system is releasable. In CD teams keep producing valuable
software in short cycles and ensure that the software can be reliably released at any time. It is used in
software development to automate and improve the process of software delivery.
• Continuous Delivery doesn't mean every change is deployed to production all the time, It means that
every change is proven to be deployable and of releasable quality at any time.

24. Core Tools of CI/CD
• Use of Source / Version Control
• CI Tool like Jenkins
• Configuration management tools like Ansible, Vagrant etc
• Build and Test Infrastructure
• Automated Build
• Automated Tests
• Automated Deployment

25. Common CI/CD Workflow

26. Continuous Deployment (CD)

27. What is Continuous Deployment
• Continuous deployment is the next extension of continuous delivery, every change that passes the
automated tests is deployed to production automatically. Continuous deployment should be the goal
of most companies that are not constrained by regulatory or other requirements.
• Continuous Deployment is a software development practice in which every code change goes through
the entire pipeline and is put into production, automatically, resulting in many production deployments
every day.
• With Continuous Delivery your software is always release-ready, yet the timing of when to push it into
production is a business decision, and so the final deployment is a manual step. With Continuous
Deployment, any updated working version of the application is automatically pushed to production.
Continuous Deployment mandates Continuous Delivery, but the opposite is not required.

28. Continuous Delivery Vs Deployment
 You need to decide scope of your Devops workflow automation.
 Continuous deployment is more suitable for the web based application release cycles where it
requires to deploy new version as soon as it is available.
 For products which does not require frequent deployment, and release time is more than a month,
in that case you can automate deploy but can trigger deployment manually.

29. Architecture Design

30. Continuous Delivery Pipeline Architecture

31. Continuous Deployment Pipeline Architecture

32. Cost Based Tool Analysis

33. Sample 1
Low Cost Setup using Open source / free Tools
Infrastructure
• OpenStack / Trial versions of
AWS/Azur / google cloud
• Dockers, Kubernetes
• Vagrant, Ansible
• Version Control – GITHub
• Code Review – Gerrit
• Bug Tracker – MantisBT
• Repository management tool –
Artifactory trial version, docker
hub
• Web server – Nginix
• Monitoring tools –
Elasticsearch, Logstash, and
Kibana (ELK stack) , Nagios
Build
• Build Tools – Make, Ant, Maven
• CI Tool – Jenkins
• Configuration management
tools – Ansible, Vagrant
Test
• Static Analysis(code quality) -
SonarQube
• Unit test framework – Junit
• Java Code Coverage – JaCoCo
• Acceptance test
framework(BDD) - Cucumber
• Test framework for web
applications – Selenium
• PaaS for Deployment Testing –
Cloud foundry

34. Sample 2
Medium cost setup combining Open source / free Tools + Proprietary Tools
Infrastructure
• lease/procure hardware
•VMWare,HyperV,KVM,XEN
•AWS, Azur, Google – licensed version
•Dockers, Kubernetes
•Vagrant, Ansible
•Version Control – Setup Git server
•Code Review – Gerrit
•Bug Tracker – Jira
•Repository management tool –
Artifactory licensed version
•Web server – Nginix
•Monitoring tools – Elasticsearch,
Logstash, and Kibana (ELK stack) ,
Nagios, splunk
Build
•Build Tools – Make, Ant, Maven
•CI Tool – Jenkins/ CloudBee Jenkins
•Configuration management tools –
Ansible, Puppet, Chef
•Provisioning tool- Vagrant
Test
•Static Analysis(code quality) -
SonarQube
•Unit test framework – Junit
•Java Code Coverage – JaCoCo, clover
•Acceptance test framework(BDD) -
Cucumber
•Test framework for web applications –
Selenium
•PaaS for Deployment Testing – Cloud
foundry

35. Thank You