Suggest an editImprove this articleRefine the answer for “How does CI integrate with Docker?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**CI and Docker** are integrated so that testing, building, and deployment run in a stable and reproducible environment, the same for all developers and servers. **Key point:** integrating CI with Docker turns the build process into a universal factory: code → container → test → stable image.Shown above the full answer for quick recall.Answer (EN)Image**CI and Docker** are integrated so that testing, building, and deployment run **in a stable and reproducible environment**, the same for all developers and servers. Docker makes the CI pipeline predictable, independent of local systems, and easy to scale. --- ### How CI uses Docker 1. **Running the build in a container** - A CI system (for example, GitHub Actions, GitLab CI, Jenkins) runs the pipeline in a Docker container with the required image (for example, `node:20`, `python:3.11`). - All steps (build, test, lint) run inside this container, which guarantees the same environment for everyone. 2. **Building the application's Docker image** - The pipeline builds a Docker image with the project's code and dependencies. - This image can be tested and later used on the server without changes. Example pipeline step: ```bash docker build -t myapp:latest . ``` 3. **Testing in a container** - Tests run inside a container that reproduces the production environment (database, services, configs). - After the tests, the container is removed, keeping the system clean. 4. **Publishing to a Docker Registry** - A successful build pushes the finished image to Docker Hub, GitLab Registry, or Amazon ECR. ```bash docker push myapp:latest ``` 5. **Preparing for CD (Continuous Deployment)** - CI finishes the checks and passes the image to the CD pipeline, where it's deployed to a server or Kubernetes. --- ### Benefits of the integration - **The same environment** - "works on CI" = "works in production". - **Fast isolation** - tests don't conflict with each other. - **Easy to scale** - containers can run in parallel. - **Simplified deployment** - CI generates a ready Docker image that goes straight to production. --- ### Conclusion Integrating CI with Docker turns the build process into a **universal factory**: code → container → test → stable image. This ensures full predictability, compatibility, and reliability of releases at every stage of development.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.