DevOps Fundamentals: Principles and Practices

DevOps Fundamentals

• DevOps is a methodology in software development and IT industry.
• DevOps combines software development (Dev) and IT operations (Ops).
• DevOps aims to improve and shorten system development life cycles.
• Key principles of DevOps include shared ownership, workflow automation, and rapid feedback.
• DevOps is a full lifecycle investment.
• DevOps is a team undertaking.
• DevOps enables better software development and delivery practices.
• DevOps accelerates the continuous delivery process.
• The global DevOps market was over 7billionin2021,andisexpectedtogrowtoover7 billion in 2021, and is expected to grow to over 7billionin2021,andisexpectedtogrowtoover70 billion by 2032.
• DevOps/DevSecOps is the most common software development methodology, used by 47% of software development teams in 2022.

Learning Outcomes

• Define DevOps values, principles, and its business benefits.
• Differentiate between Agile and DevOps.
• List DevOps principles, business benefits, and values.
• List practices and important tools in DevOps life cycle.
• Describe key concepts of Continuous Integration and Continuous Delivery.

Principles of DevOps

• Principle 1: Encourage Collaboration
• Principle 2: Decision-based on Data Analysis
• Principle 3: Customer-centric Action
• Principle 4: Constant Improvement
• Principle 5: Responsibility throughout the Lifecycle
• Principle 6: Automate what you can
• Principle 7: Failure as a learning opportunity

DevOps Business Benefits

• Reduced time taken to create and deliver software
• Reduced application maintenance complexity
• Improved collaboration between developers and operations teams
• Ensured faster time to market through continuous integration and delivery

Agile and DevOps

• Agile is a business methodology emphasizing short, iterative development cycles.
• Agile helps with control, predictability, and adapting to change.
• DevOps extends Agile and combines development (Dev) and operations (Ops).
• DevOps aims to enhance collaboration, communication, and processes to speed up software delivery.

Key Differences between DevOps and Agile

• DevOps focuses on agility in both Development and Operations, whereas Agility is in only development.
• DevOps incorporates processes like CI/CD, whereas Agile incorporates processes like Scrum and Agile Kanban.
• DevOps prioritizes both timeliness and quality whereas Agile prioritizes timeliness.
• DevOps uses self monitoring tools for feedback, whereas Agile uses customer feedback.

Key Differences between DevOps and Agile (Agile Manifesto)

• Individuals and interactions over processes and tools
• Working software over comprehensive documentation
• Customer collaboration over contract negotiation
• Responding to change over following a plan

DevOps Three Ways

• Systems thinking – understanding complex software systems
• Amplifying feedback loops – improving communication between teams
• Cultural change – fostering continuous experimentation and learning

DevOps Phases & Tools

• The software development and delivery workflow is divided into eight phases: Plan, Code, Build, Test, Integrate, Deploy, Monitor, and Operate.
• Tools like Maven, Gradle, Jenkins, Cucumber, Selenium, JUnit, Chef, and Ansible are utilized throughout these stages.

DevOps Process: 8 Steps

• Pick a Component
• Consider Adopting Scrum
• Use Git-based Version Control
• Integrate with Work Tracking Tools
• Write Tests
• Build out a CI/CD to Deploy
• Add Monitoring Mechanism
• Use Feature Flags

DevOps Framework: CALMS

• Culture – prioritize people and processes
• Automation – leverage automation tools to control systems
• Lean – streamline activities by eliminating low-value activities
• Measurement – utilize relevant metrics to improve
• Sharing – provide essential feedback for improvement

DevOps Pipeline

• Set of automated processes and tools allowing Dev and Ops professionals to build and deploy code to a production environment.
• Includes build automation, continuous integration, automation testing, validation, and reporting.
• Features include continuous integration, continuous delivery, continuous deployment, continuous feedback, and continuous operations.

Continuous Integration/Continuous Delivery/Continuous Deployment

• Continuous Integration (CI): Automatically builds and tests the application frequently (ideally every code check-in).
• Continuous Delivery (CD): Extends CI by deploying changes to a production-like environment.
• Continuous Deployment (CD): Every change verified by automated testing is automatically deployed to production.

How to Make Continuous Integration Possible

• Developers integrate work into a main/master branch regularly.
• Automated tests are performed before and after the merge.
• Large features are broken into smaller pieces.
• Main/master branch changes are implemented into suites of automated unit tests.

Continuous Delivery

• Ability to get changes including features, configuration changes, and bug fixes into production quickly.
• Goal is to make deployments manageable tasks in complex environments.

Continuous Testing

• Key principles and practices in testing: Code hygiene, Unit testing, Integration testing, Behavior Driven Design (BDD) /Acceptance-Testing Driven Development (ATDD), Infrastructure Testing, Performance Testing, Security Testing.

Summary

• DevOps encompasses principles, culture, values, business benefits, Agile Development considerations.
• DevOps features continuous integration, continuous delivery, and practices around DevOps life cycles, popular tools, and their application.

Explore the core principles and values of DevOps, a methodology uniting software development and IT operations. Learn how DevOps accelerates delivery, fosters collaboration, and automates workflows. Understand its business benefits and differentiate it from Agile.