ci cd

**CI/CD: Continuous Integration / Continuous Deployment** **Overview** CI/CD is a set of practices that allow developers to deliver code changes frequently and reliably. It automates the "Path to Production." **CI (Continuous Integration)** "Merge often." 1. Developer pushes code to Git. 2. **Build**: Compile the code / docker build. 3. **Test**: Run Unit Tests, Linting, Security Scans. 4. **Result**: Pass/Fail. If Pass, merge to `main`. **CD (Continuous Deployment)** "Release often." 5. **Deploy**: Automatically push the passed build to Staging/Production servers. - Updates AWS Lambda. - Restarts Kubernetes Pods. **Benefits** - **Speed**: No manual "Release Day" stress. Releases happen 10x per day. - **Safety**: Tests prevent bugs from reaching users. - **Feedback**: Developers know instantly if they broke something. **Tools** - **Jenkins**: Old school, self-hosted, infinite customization. - **GitHub Actions**: Modern, integrated into Git. - **GitLab CI**: Integrated into GitLab. - **CircleCI**: SaaS specific.