EXPOSE Does Not Publish Ports

Multi-Stage Build Missing Copy

Build Cache Mechanics and Invalidation

Image Layers & the Layered Filesystem

CMD vs ENTRYPOINT & Their Interaction

Inspecting Image History & Layers

Metadata Instructions: LABEL, USER, VOLUME, HEALTHCHECK

Managing Docker Images

Multi-Stage Builds

.dockerignore File Usage

Image Tagging & Naming Conventions

Ordering Instructions for Cache Efficiency

Build Cache & Layer Caching

Build Context & docker build

ENV & ARG: Build vs Run Scope

COPY vs ADD Differences

Dockerfile Instruction Reference

Base Images & the FROM Instruction

Union Filesystem & Copy-on-Write

Shell Form vs Exec Form

HEALTHCHECK Instruction in Dockerfiles

Reducing Docker Image Size

Multi-Stage Builds for Smaller Images

EXPOSE Purpose

VOLUME in Dockerfile

RUN During Build

CMD vs ENTRYPOINT

WORKDIR Behavior

Image Layers and Caching

Cache Invalidation and Ordering

Build Context

The 'latest' Tag

Reducing Image Size

Image Repository Format

Copy-on-Write Layer

Shell vs Exec Form

RUN Instruction

.dockerignore File

docker build and Build Context

Combining RUN Commands

Cache Invalidation and Ordering

Image Digests

Choosing Minimal Base Images

USER Instruction

Inspecting Docker Images

Tagging and Naming Docker Images

Using .dockerignore to Exclude Files

Building Images with docker build

Ordering Instructions to Optimize Cache

Split apt-get Layers

COPY Order Wrecks Cache

build-arg for Undeclared ARG

Invalid LABEL Syntax

ONBUILD in the Final Image

Layer Caching and Copy Order

RUN vs CMD for Startup

Multiple CMD Instructions

Exec Form and Variable Expansion

COPY Won't Extract Archives

Dockerignore Excludes Needed File

ARG Not Available at Runtime

cd Does Not Persist Across RUN

Deleting Files Doesn't Shrink Image

Alpine and glibc Binaries

Unpinned latest Tag

ENV Expansion Order

Non-Root User Breaks Install

Writing to a VOLUME Directory

HEALTHCHECK Missing CMD

Image Layers and Dockerfile Instructions

VOLUME Instruction in Dockerfile

USER: Running as Non-Root

LABEL for Image Metadata

EXPOSE for Documenting Container Ports

ENV and ARG in Dockerfiles

Build Cache Invalidation

docker build and Build Context

Multi-Stage Builds

Image Size Optimization

Ordering for Cache Efficiency

Image Tagging Conventions

.dockerignore Usage

Inspecting Images

HEALTHCHECK Instruction

Image Digests

WORKDIR Instruction

EXPOSE Instruction

VOLUME Instruction

LABEL and Metadata

USER and Non-Root

Image Layers per Instruction

ENV vs ARG

Dockerfile Instruction Syntax

FROM and Base Images

RUN Shell vs Exec Form

CMD Instruction Behavior

ENTRYPOINT and CMD Interaction

COPY vs ADD

CMD vs ENTRYPOINT Explained

WORKDIR: Setting the Working Directory

COPY vs ADD for Adding Files

Dockerfile Instruction Syntax

RUN: Shell vs Exec Form

HEALTHCHECK Instruction

Ordering for Cache Optimization

EXPOSE Instruction

COPY vs ADD

VOLUME Instruction

Image Tagging and Naming

Building with docker build

LABEL and Metadata

ENV vs ARG

CMD vs ENTRYPOINT

FROM and Base Images

Managing Local Images

Inspecting Image History

Reducing Image Size

Multi-Stage Builds

Build Context and .dockerignore

Image Layers and Caching

USER and Non-Root

WORKDIR Instruction

Image Digests and Immutability

Choosing a Base Image

RUN Instruction in Dockerfiles

Choosing and Using the FROM Base Image

Anatomy of a Dockerfile