The Docker Book

The Docker Book

James Turnbull August 26, 2019 Version: v18.09.2 (c2c5fa8) Website: The Docker Book

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This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of

this license, visit here.

? Copyright 2016 - James Turnbull

Contents

Page

Chapter 1 Working with Docker images and repositories

1

What is a Docker image? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Listing Docker images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pulling images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Searching for images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Building our own images . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Creating a Docker Hub account . . . . . . . . . . . . . . . . . . . . . . 13

Using Docker commit to create images . . . . . . . . . . . . . . . . . 15

Building images with a Dockerfile . . . . . . . . . . . . . . . . . . . . 18

Building the image from our Dockerfile . . . . . . . . . . . . . . . . . 22

What happens if an instruction fails? . . . . . . . . . . . . . . . . . . 25

Dockerfiles and the build cache . . . . . . . . . . . . . . . . . . . . . . 27

Using the build cache for templating . . . . . . . . . . . . . . . . . . . 27

Viewing our new image . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Launching a container from our new image . . . . . . . . . . . . . . 30

Dockerfile instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Pushing images to the Docker Hub . . . . . . . . . . . . . . . . . . . . . . 58

Automated Builds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Deleting an image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Running your own Docker registry . . . . . . . . . . . . . . . . . . . . . . 66

Running a registry from a container . . . . . . . . . . . . . . . . . . . 66

Testing the new registry . . . . . . . . . . . . . . . . . . . . . . . . . . 67

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Contents

Alternative Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Quay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

List of Figures

71

List of Listings

75

Index

76

Version: v18.09.2 (c2c5fa8)

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