What Is CI/CD In DevOps?

halfbrain_logo512adminJune 21, 2026
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What Is CI/CD In DevOps?

CI/CD is a controlled delivery pipeline. CI means continuous integration: developers merge code frequently and automated checks run early. CD means continuous delivery or deployment: tested code can move toward production in a repeatable way.

The important idea is simple: do not trust memory, manual steps, or random deployment habits. Put the release process into a pipeline so every change follows the same path.

DevOps Production Playbook

Use this section to understand where the concept fits in a real software delivery system: pipeline stage, production risk, detection signals, rollback, security, and big-company standard.

CI/CDBuild
Core Problem

Teams need a repeatable way to test, build, and deploy code without depending on manual release steps.

Mental Model

CI/CD is a conveyor belt for software changes. Every commit should move through checks before it reaches production.

Production Scenario

A developer opens a pull request. The pipeline runs linting, tests, security checks, builds a Docker image, and deploys to staging. Production release happens only after checks pass.

Tooling Context

GitHub Actions, GitLab CI, Jenkins, Docker, artifact registry, test runner, deployment script, secret manager.

Command Examples

git push origin main; docker build -t app:latest .; docker run --rm app:latest; npm test; pytest; echo $CI

Config Example

name: ci; on: push; jobs: build-test; steps: checkout -> install -> test -> build

Failure Modes

Flaky tests, missing secrets, broken dependency, failed image build, wrong branch trigger, production deploy without approval, no rollback artifact.

Detection Signals
DORA Impact

CI/CD can reduce lead time and improve deployment frequency. Weak CI/CD increases failed changes and slows recovery.

Rollback Plan

Revert commit, redeploy previous artifact, restore previous container image tag, pause pipeline, check deployment logs, verify staging before retry.

Security Check

Protect CI secrets. Use environment-specific variables. Require review before production deploy. Scan dependencies and container images.

Big Company Standard

A big company expects branch protection, required checks, artifact versioning, approval gates, audit logs, and clear rollback steps.

Lab Task

Create a simple CI workflow that runs tests on every push and blocks deployment when tests fail.

Interview Angle

What is the difference between CI, continuous delivery, and continuous deployment? Why should production deployment be controlled?

Common Mistakes

Putting deployment scripts only on one engineer's laptop, skipping tests to go faster, using latest tag blindly, storing secrets in repository.

Transferable Principle

Every repeated delivery process should become a pipeline. This principle applies to software, infrastructure, content publishing, and AI automation.

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