liveBook · Manning

Staging image

As explained in Learn Docker in a Month of Lunches, Second Edition

A staging image is a container image stored for validation before it is promoted for production deployment.

A staging image is a container image held for validation before production release. Automated smoke tests run the application from staging images, providing confidence before images move to a release repository. section 16.3

Use staging images to separate developer changes from tester-facing validation:

  • Run the smoke-test script with local images when checking changes you built yourself. section 16.3
  • Run it without the local flag to pull the latest images from the staging repository. section 16.3
  • Use staging images to reproduce an issue reported by a tester, then promote validated images through the release workflow. section 16.3

How Learn Docker in a Month of Lunches, Second Edition covers it

How deep it goes
Explains repository selection, local overrides, and release tagging, but stops short of detailed image-building internals.
Examples
Uses a Docker Compose smoke-test script, local-image override, staging repository pulls, and release-image tagging.
What you can do after
Apply it via Docker Compose to validate application startup and reproduce tester-reported issues with consistent images.
How it connects
Connects container images with Docker Compose, smoke testing, CI/CD, and GitHub Actions.
Cover of Learn Docker in a Month of Lunches, Second Edition
liveBookmanning.com
Read Learn Docker in a Month of Lunches, Second Edition on liveBook Get the book at manning.com

This explainer was generated by Manning's knowledge graph from the text of Learn Docker in a Month of Lunches, Second Edition. The section links point to the parts of the book it draws on.