Dockerfile
Everything on SkillVeris tagged Dockerfile — collected across the glossary, study notes, blog, and cheat sheets.
12 resources across 3 libraries
Study Notes(1)
Cheat Sheets(1)
Interview Questions(10)
What is Docker?
Docker is a platform that packages an application together with its dependencies, libraries, and runtime into a lightweight, portable unit called a container,…
What is a Docker Image vs a Container?
A Docker image is a read-only, layered blueprint containing the application code, dependencies, and configuration, while a container is a running, writable ins…
What is a Dockerfile?
A Dockerfile is a plain-text script of sequential instructions that tells the Docker engine exactly how to assemble a Docker image, layer by layer.
How Do Docker Image Layers and Build Caching Work?
Each instruction in a Dockerfile produces an immutable, content-addressed image layer, and Docker’s build cache reuses a previously built layer whenever the in…
What is a Docker Multi-Stage Build?
A multi-stage Docker build uses multiple FROM instructions in one Dockerfile, where each stage can compile or prepare artifacts and only the final stage copies…
What Are Dockerfile Best Practices?
Dockerfile best practices center on minimizing image size and build time while maximizing cache reuse and security: use a small pinned base image, order instru…
What is the Difference Between ENTRYPOINT and CMD?
ENTRYPOINT defines the fixed, always-executed command a container runs, while CMD supplies default arguments to that command (or a default full command if no E…
What is the Docker Build Context and Why Does It Matter?
The Docker build context is the set of files at a specified path (or URL) that the Docker client packages up and sends to the Docker daemon before a build star…
How do container image layers work, and why do they matter for build speed?
A container image is a stack of read-only filesystem layers, each produced by one build instruction and identified by a content hash, that a union filesystem o…
What causes cache busting in Docker builds, and how do you avoid it?
Cache busting happens when a Dockerfile instruction’s cache key changes unexpectedly — usually because an earlier layer’s content changed, the instruction itse…