Multi-Stage Builds & Image Optimization

Multi-Stage Builds for Smaller Images

Multi-Stage Build Missing Copy

EXPOSE Does Not Publish Ports

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

Shell vs Exec Form

Copy-on-Write Layer

Image Repository Format

Reducing Image Size

The 'latest' Tag

Build Context

Cache Invalidation and Ordering

VOLUME in Dockerfile

WORKDIR Behavior

CMD vs ENTRYPOINT

RUN During Build

Image Layers and Caching

Choosing Minimal Base Images

RUN Instruction

Cache Invalidation and Ordering

Image Digests

.dockerignore File

docker build and Build Context

USER Instruction

Combining RUN Commands

Inspecting Docker Images

Tagging and Naming Docker Images

Using .dockerignore to Exclude Files

Building Images with docker build

Ordering Instructions to Optimize Cache

Deleting Files Doesn't Shrink Image

cd Does Not Persist Across RUN

ARG Not Available at Runtime

Dockerignore Excludes Needed File

COPY Won't Extract Archives

Exec Form and Variable Expansion

Multiple CMD Instructions

RUN vs CMD for Startup

COPY Order Wrecks Cache

build-arg for Undeclared ARG

Invalid LABEL Syntax

ONBUILD in the Final Image

Layer Caching and Copy Order

HEALTHCHECK Missing CMD

Split apt-get Layers

Writing to a VOLUME Directory

Non-Root User Breaks Install

ENV Expansion Order

Unpinned latest Tag

Alpine and glibc Binaries

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

Image Layers per Instruction

Image Tagging Conventions

.dockerignore Usage

Ordering for Cache Efficiency

Inspecting Images

HEALTHCHECK Instruction

Image Digests

USER and Non-Root

LABEL and Metadata

VOLUME Instruction

EXPOSE Instruction

ENV vs ARG

WORKDIR Instruction

COPY vs ADD

ENTRYPOINT and CMD Interaction

CMD Instruction Behavior

RUN Shell vs Exec Form

FROM and Base Images

Dockerfile Instruction Syntax

Build Cache Invalidation

docker build and Build Context

Multi-Stage Builds

Image Size Optimization

CMD vs ENTRYPOINT Explained

WORKDIR: Setting the Working Directory

COPY vs ADD for Adding Files

Image Digests and Immutability

VOLUME Instruction

Dockerfile Instruction Syntax

RUN: Shell vs Exec Form

HEALTHCHECK Instruction

Ordering for Cache Optimization

EXPOSE Instruction

COPY vs ADD

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

Choosing a Base Image

Image Tagging and Naming

Building with docker build

LABEL and Metadata

ENV vs ARG

CMD vs ENTRYPOINT

FROM and Base Images

RUN Instruction in Dockerfiles

Choosing and Using the FROM Base Image

Anatomy of a Dockerfile