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What is Pipeline as Code?

Defining CI/CD pipeline configurations as version-controlled code files rather than through UI-based pipeline builders.

Pipeline as Code stores build, test, and deployment pipeline definitions in the same repository as application code. Examples include Jenkinsfile (Jenkins), .github/workflows/*.yml (GitHub Actions), .gitlab-ci.yml (GitLab), and azure-pipelines.yml (Azure DevOps). Benefits include version history of pipeline changes, code review for pipeline modifications, branch-specific pipeline variations, and reproducibility. Pipelines typically define stages (build, test, deploy), steps within stages, environment variables, triggers (push, PR, schedule), and conditions. Treating pipelines as code enables the same engineering practices (review, testing, rollback) applied to application development.

Related Terms

Rolling Update
A deployment strategy that gradually replaces old application instances with new ones, maintaining availability throughout.
Terraform
An open-source tool for provisioning and managing cloud infrastructure using declarative configuration files.
Health Check
An endpoint or mechanism that reports whether an application is running correctly and ready to handle requests.
Immutable Deployment
A deployment strategy where new versions replace existing instances entirely rather than updating them in place.
Docker Compose
A tool for defining and running multi-container Docker applications using a YAML configuration file.
Log Aggregation
The process of collecting, centralizing, and indexing log data from multiple sources for unified search and analysis.
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