Lesson 221
CI/CD & DevOps
Ship fast, ship safe
1:00How a single git push becomes running production software — the pipeline, CI vs Continuous Delivery vs Deployment, IaC, deployment strategies, observability, and the DORA metrics.
By the end, you can
- Explain what DevOps is and identify the five elements of the CALMS model.
- Trace a commit through the five pipeline stages and explain what each one does.
- Describe how CI prevents broken code from reaching production.
- Distinguish Continuous Integration, Continuous Delivery, and Continuous Deployment by their gates and automation levels.
- Explain what makes Infrastructure as Code declarative and idempotent.
- Compare Rolling, Blue-green, Canary, and Feature flag strategies and identify when each is preferred.
- Describe how a canary release limits blast radius and how rollback works.
- Name the three pillars of observability and explain what an SLO and error budget are.
- List the DORA four keys, classify each as a speed or stability metric, and explain why all four must be measured together.
- Apply the shift-left principle to explain why early testing is cheaper than late testing.
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