This page includes all the theory related to DevOps.

• Goals of DevOps

• DevOps Lifecycle

• CI (Continuous Integration)

• CD (Continuous Deployment)

• Evolution of DevOps

• What the top companies are doing now

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DevOps is a combination of software development (dev) and operations (ops). It is defined as a software engineering methodology which aims to integrate the work of development teams and operations teams by facilitating a culture of collaboration and shared responsibility.

What is the goal of DevOps?

DevOps represents a change in mindset for IT culture. In building on top of Agile practices, DevOps focuses on incremental development and rapid delivery of software. Success relies on the ability to create a culture of accountability, improved collaboration, empathy, and joint responsibility for business outcomes.

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The DevOps lifecycle and how DevOps works

The DevOps lifecyle stretches from the beginning of software development through to delivery, maintenance, and security. The stages of the DevOps lifecycle are:

Plan: Organize the work that needs to be done, prioritize it, and track its completion.

Create: Write, design, develop and securely manage code and project data with your team.

Verify: Ensure that your code works correctly and adheres to your quality standards — ideally with automated testing.

Package: Package your applications and dependencies, manage containers, and build artifacts.

Secure: Check for vulnerabilities through static and dynamic tests, fuzz testing, and dependency scanning.

Release: Deploy the software to end users.

Configure: Manage and configure the infrastructure required to support your applications.

Monitor: Track performance metrics and errors to help reduce the severity and frequency of incidents.

Govern: Manage security vulnerabilities, policies, and compliance across your organization.

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CI

The "CI" in CI/CD always refers to continuous integration, an automation process for developers that facilitates more frequent merging of code changes back to a shared branch, or “trunk.” As these updates are made, automated testing steps are triggered to ensure the reliability of merged code changes.

CD

The final stage of a mature CI/CD pipeline is continuous deployment. Continuous deployment is an extension of continuous delivery, and can refer to automating the release of a developer’s changes from the repository to production, where it is usable by customers.

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Evolution of DevOps

• Before DevOps:
  Development and operations were siloed. Developers focused on speed; operations prioritized stability. This caused miscommunication, delays, and blame.

• The Shift Begins (2007–2009):
  Patrick Debois and others launched the DevOps movement to bridge the gap. The first DevOpsDays conference in 2009 sparked global interest.

• Why DevOps Took Off:

  • Faster and more reliable deployments

  • Shorter time-to-market

  • Better collaboration and fewer errors

• DevOps Culture Today:
  A mindset that blends automation, collaboration, and continuous improvement across teams.

• Key Practices & Technologies:

  • Automation across the pipeline

  • Cloud computing for scalability

  • Containerization (Docker/Kubernetes)

  • Microservices for modular apps

  • CI/CD for continuous delivery and testing

  • Monitoring & feedback for rapid fixes

• Modern DevOps Roles:
  DevOps engineers manage complex systems, use toolchains, and ensure reliable, scalable delivery.

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What the top companies are doing now

• DevSecOps: Security is built into every stage (Google, Microsoft, Amazon).

• Platform Engineering: Internal tools let developers deploy independently (Spotify, GitHub).

• AI in DevOps: Predictive monitoring, auto-remediation, and code insights (Meta, IBM).

• GitOps & IaC: Infrastructure managed via Git (Red Hat, Shopify).

• Microservices & Serverless: Scalable, fast systems with Kubernetes, AWS Lambda (Netflix, Uber).

• Chaos Engineering: Test system failures proactively (Netflix, LinkedIn).

• Cloud-Native: Everything runs on Kubernetes with multi-cloud setups (IBM, VMware).

• DevEx Focus: Improving developer experience for faster delivery (Shopify, Stripe).

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Reference

https://devops.com/the-evolution-of-devops/