KNOWLEDGE / Docker / DevOps
Docker for Repeatable Services
A production-minded model for images, containers, layers, networks, and local environments.
DockerDevOpsContainers
- DOMAIN
- DevOps
- LEVEL
- Foundational
- READ
- 7 min
- UPDATED
- Aug 1, 2026
MENTAL MODEL / KEY IDEAS
Keep these in mind
- 01An image is an immutable build result
- 02Runtime state stays outside the image
- 03Reproducibility requires pinned inputs
Image and container
The image packages the filesystem and process configuration. A container is a runtime instance with its own writable layer and resource boundaries.
- Layer cache
- Entrypoint
- Volumes
- Networks
Build well
Small build contexts, multi-stage images, locked dependencies, and non-root runtime users improve speed and safety.
- Pin base images
- Copy dependency files first
- Exclude secrets
Operate predictably
Health signals, graceful shutdown, and explicit configuration make the same image useful from local development to deployment.