What is CI/CD? | Harness Glossary

Chinmay Gaikwad, February 27, 2024

Key takeaway

Continuous integration/continuous delivery (CI/CD) is a software development practice that focuses on automating the process of integrating code changes, testing them, and delivering them to production environments in a rapid and reliable manner. The article explores how CI/CD pipelines automate key stages of the software development lifecycle.

What are the Benefits of CI/CD Pipelines?

By automating the process of building, testing, and deploying code changes, CI/CD enables faster delivery of high-quality software while reducing risks and improving collaboration. Here are some key benefits of CI/CD:

Faster time-to-market

CI/CD allows for rapid and frequent releases of software updates. By automating the integration and deployment processes, developers can quickly deliver new features, bug fixes, and improvements to end-users. This accelerated time-to-market gives organizations a competitive edge by enabling them to respond swiftly to market demands and user feedback.

Improved code quality

With CI/CD, every code change undergoes automated testing, ensuring that it meets predefined quality standards. By catching bugs and issues early in the development cycle, CI/CD helps maintain a high level of code quality. This reduces the likelihood of introducing critical bugs into production and enhances the overall stability and reliability of the software.

Enhanced collaboration

CI/CD promotes collaboration among development teams. By automating the integration of code changes from multiple developers, CI/CD eliminates manual merging and reduces conflicts. This allows developers to work concurrently on different features or bug fixes, increasing productivity and smoother teamwork.

Continuous feedback loop

CI/CD provides a continuous feedback loop for developers. Developers receive immediate feedback on their code changes through automated testing and deployment. This rapid feedback loop encourages iterative development and empowers developers to improve based on real-time insights. It also facilitates faster bug detection and resolution, resulting in more efficient development cycles.

Reduced risk

CI/CD minimizes the risk associated with software deployments. Organizations can automate the deployment process to ensure consistent and repeatable procedures. This reduces the chances of human error and configuration drift, leading to more stable and reliable software deployments. Additionally, catching bugs early in the development cycle reduces the risk of critical issues reaching production.

Scalability and flexibility

CI/CD enables organizations to scale their software development processes efficiently. By automating repetitive tasks, such as building and testing, CI/CD allows teams to handle larger codebases and accommodate increased development velocity. It also provides flexibility by supporting different deployment environments and configurations, making it easier to adapt to changing business requirements.

What is Continuous Integration (CI)?

Continuous Integration (CI) is a software development practice that automates the process of integrating code changes from multiple developers into a shared repository. The main goal of CI is to detect and address integration issues as early as possible, ensuring that the software remains functional at all times.

In a CI workflow, developers frequently commit code changes to a version control system, such as Git. Each commit triggers an automated build process, where the code is compiled, tested, and integrated with the existing codebase. This allows developers to identify any conflicts or errors that may arise due to the integration of their changes with the work of other team members.

One of the key principles of CI is the concept of a "mainline" or "trunk" branch, which serves as the central repository for the project's codebase. Developers are encouraged to commit their changes to this mainline branch regularly, ensuring that the latest code is always available for integration and testing. This promotes collaboration and reduces the risk of long-lived branches that can lead to integration difficulties.

Automated testing plays a crucial role in CI. As part of the CI process, various types of tests, including unit tests, integration tests, and regression tests, are executed to verify the correctness and stability of the codebase. These tests help identify any issues introduced by new code changes and provide timely feedback to developers. If any tests fail, developers are notified immediately, allowing them to address the issues promptly.

What is Continuous Deployment (CD)?

Continuous Deployment (CD) is a software development practice that focuses on automating the process of deploying code changes to production environments. It aims to deliver new features, bug fixes, and improvements to end-users quickly and reliably by streamlining the deployment process.

In a CD workflow, code changes that have passed through the Continuous Integration (CI) phase are automatically deployed to production environments without manual intervention. This automation eliminates the need for time-consuming and error-prone manual deployments.

CD relies on a combination of automated testing, infrastructure provisioning, and release management practices to enable seamless and efficient deployments. Automated tests are executed as part of the CD pipeline to ensure that the code changes meet predefined quality standards and do not introduce regressions or critical bugs.

What is Continuous Delivery (CD)?

Continuous delivery (CD) is a software development approach that focuses on delivering high-quality software to users in a fast and reliable manner. It aims to automate the entire software release process, allowing for frequent and reliable releases. The key principle of CD is to ensure that every change made to the codebase should be tested and ready for deployment at any time.