SESSION OVERVIEW This session combines the principles of Test-Driven Development and Containerization. Test-Driven Development is a well-known Software Development process with a focus on minimizing waste. If followed properly, the TDD principles help developers achieve a clear focus on software acceptance criteria. On the other hand, containerization is a key to DevOps automation practice that has gained a lot of traction relatively to the Docker. When utilized properly, containerization can help to transform your application and its environment into a lean and immutable artifact. Given that, Containerization and TDD help to achieve Lean practices, it also follows that TDD can be effectively used to drive the design, development and validation of Dockerized applications. TDD principles can help create highly efficient, validated application images. This session introduces participants to the idea of utilizing TDD for developing Docker images, and then demonstrates an example of utilizing TDD for containerizing a sample application. SESSION AGENDA 15 min - Overview of principles 15 min - Interactive Demo 15 min - Q & A and Discussions. SESSION TAKEAWAYS An understanding of Test Driven Development A basic understanding of ServerSpec Ideas for how TDD can benefit containerization A basic understanding of Docker A demo of creating validated Docker images for a web application. DURATION 45 Mins

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Test-Driven Development
Applied to Containerization with Docker

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2013
Continuous Delivery
Mobile DevOps
DevOps Culture
2017
Enterprise DevOps
Vision and Strategy
2008
Software Development
DevOps Automation
Continuous Integration
2018
DevOps Coach,
Continuous Delivery
Coach
2016
DevOps - Sharing
Lean
TDD
Vish’s Journey

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Agenda
A Quick Recap 5 min
TDD and Container Development 10 min
Demo 15 min
Q&A 15 min

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A Quick Recap
Of Infra-as-Code

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5
Infrastructure-as-
Code is a
Continuous Cycle
DESIGNED INFRASTRUCTURE
Design Patterns applied to Infrastructure
Code for Modularity, Reusability
DISPOSABLE INFRASTRUCTURE
Completely tear down and recreate entire
infrastructure using code
DEVELOPED INFRASTRUCTURE
Software Development Practices applied
to Infrastructure code: Design Patterns,
Pair Programming
VERSIONED INFRASTRUCTURE
Regular releases of infrastructure
code
TESTABLE, TESTED
INFRASTRUCTURE
Test Strategies, Automated Testing and
Test Infrastructure for Infra code

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Where does TDD come in?
A software dev method applied to container
infrastructure

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Container Patterns
● Lean
● Versioned
● Immutable
How do we achieve this?

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The Mindset Shift
I’m developing a
containerized
application.
I’m writing a
Dockerfile.

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Base Image?
Packages?
Volume
mounting?
Ports to
forward?
Am I making
my image
efficient?
Am I using
Docker best
practices?
Is my image
secure?

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TDD
Cycle

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Demo
Our Theory in Action

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Thank You!
www.agilityroots.com/blog
github.com/savishy
linkedin.com/in/vishwanathv

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References
● Icons courtesy Freepik, Docker
● Container Patterns/Anti-patterns: [1], [2], [3]
● Containers and Infra-as-Code: [1]