What Is DevOps? Understanding CI, CD, and Agile in Modern Software Delivery
This article explains DevOps as the integration of development and operations, defines continuous integration (CI) and continuous delivery/deployment (CD), contrasts them with agile development, and illustrates how these practices streamline software delivery, testing, and production deployment.
DevOps Overview
DevOps combines Development and Operations into a methodology that promotes communication, collaboration, and integration between application development, operations, and quality assurance teams, aiming to break down traditional barriers.
It emphasizes a culture where developers (Dev) and IT operations staff (Ops) work together, using automation of software delivery and infrastructure changes to make building, testing, and releasing software faster, more frequent, and more reliable.
Continuous Integration (CI)
CI (Continuous Integration) means developers frequently commit code to the main branch, where each change is automatically built and tested before merging.
The CI process automatically detects source code changes, pulls the code, builds it, and typically runs unit tests, ensuring new changes are good and suitable for further use.
Continuous Delivery (CD) and Continuous Deployment
CD can refer to Continuous Delivery or Continuous Deployment. After CI completes automated build and testing, Continuous Delivery automatically publishes the verified code to a repository, aiming for a codebase that can be deployed to production at any time.
Continuous Deployment extends Continuous Delivery by automatically releasing the production‑ready build to the production environment without manual intervention.
Continuous Delivery provides the capability to deploy at any time, while Continuous Deployment is the highest stage where every change is automatically deployed.
Agile Development
Agile development focuses on a mindset that embraces change and rapid iteration. It is more of a conceptual approach than a specific toolchain, emphasizing flexibility and quick delivery.
Relationship Between CI, CD, and DevOps
CI, CD, and DevOps are interrelated concepts. CI provides the foundation of automated building and testing; CD builds on CI to enable automated delivery and deployment; DevOps encompasses the cultural and procedural practices that bring development and operations together to realize these automation pipelines.
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