Best practices

Overview

Teaching: 15 min
Exercises: 20 min

Questions

• Are there any practices I should avoid?

• Are there practices I should try to follow?

• How can I keep my images small?

• How can I speed up iterative updates and testing?

Objectives

• Learn some do’s and don’ts

• Learn how to manage image sizes and avoid surprises

• Learn how to use effectively use the build cache to speed up builds

Key Points

• Use a Dockerfile

• Use Trusted Images

• Use versioned dependencies

• Combine steps in a single RUN statement to reduce image size

• Use && to catch errors in multi-step RUN statements

• Use ordering to speed up rebuilds using the build cache

• Use multi-stage builds