Practical Docker with Python (eBook)

Sathyajith Bhat is a seasoned DevOps/SRE professional currently working as a DevOps Engineer on Adobe I/O, which is Adobe’s developer ecosystem and community. Prior to this, he was the lead Ops/SRE at Styletag.com. He transitioned to Ops/SRE after being a lead analyst at CGI, working primarily on Oracle Fusion stack (Oracle DB/PL/SQL/Oracle Forms and other related middleware) designing, architecting, and implementing complete end-to-end solutions for a major insurance provider in the Nordics.In his free time, Sathya is part of the Barcamp Bangalore planning team, handling DevOps and Social Media for BCB. He is also a volunteer Community Moderator at Super User and Web Apps Stack Exchange, keeps the servers for Indian Video Gamer forums up and running, and was previously a Moderator for Chip-India and Tech 2 forums.

Table of Contents 5
About the Author 8
About the Technical Reviewer 9
Acknowledgments 10
Introduction 11
Chapter 1: Introduction to  Containerization 12
What Is Docker? 12
Docker the Company 12
Docker the Software Technology 13
Understanding Problems that Docker Solves 13
Containerization Through the Years 15
1979: chroot 15
2000: FreeBSD Jails 15
2005: OpenVZ 15
2006: cgroups 16
2008: LXC 16
Knowing the Difference Between Containers and Virtual Machines 16
Summary 19
Chapter 2: Docker 101 20
Installing Docker 20
Installing Docker on Windows 21
Installing on MacOS 23
Installing on Linux 24
Additional Steps 25
Understanding Jargon Around Docker 27
Layers 27
Docker Image 28
Docker Container 28
Bind Mounts and Volumes 29
Docker Registry 29
Dockerfile 30
Docker Engine 31
Docker Daemon 31
Docker CLI 31
Docker API 33
Docker Compose 34
Docker Machine 34
Hands-On Docker 35
Working with Docker Images 37
Working with a Real-World Docker Images 41
Summary 49
Chapter 3: Building the Python App 50
About the Project 50
Setting Up Telegram Messenger 51
BotFather: Telegram’s Bot Creation Interface 53
Creating the Bot with BotFather 54
Newsbot: The Python App 57
Installing Dependencies of Newsbot 57
Running Newsbot 58
Sending Messages to Newsbot 59
Summary 62
Chapter 4: Understanding the Dockerfile 63
Dockerfile 63
Build Context 64
Dockerignore 65
Building Using Docker Build 66
Dockerfile Instructions 69
FROM 70
WORKDIR 71
ADD and COPY 75
RUN 77
CMD and ENTRYPOINT 79
Gotchas About Shell and Exec Form 82
ENV 83
VOLUME 85
EXPOSE 85
LABEL 88
Guidelines and Recommendations for Writing Dockerfiles 89
Multi-Stage Builds 90
Dockerfile Exercises 91
Summary 99
Chapter 5: Understanding Docker Volumes 100
Data Persistence 100
Example of Data Loss Within Docker Container 101
tmpfs Mounts 103
Bind Mounts 104
Volumes 108
Docker Volume Subcommands 109
Create Volume 109
Inspect 110
List Volumes 111
Prune Volumes 111
Remove Volumes 111
Using Volumes When Starting a Container 112
VOLUME Instruction in Dockerfile 115
Docker Volume Exercises 116
Summary 127
Chapter 6: Understanding Docker Networks 128
Why Do We Need Container Networking? 128
Default Docker Network Drivers 129
Bridge Network 129
Host Network 130
Overlay Network 131
Macvlan Networks 131
None Networking 131
Working with Docker Networks 132
Bridge Networks 136
Creating Named Bridge Networks 141
Connecting Containers to Named Bridge Networks 146
Host Networks 150
Docker Networking Exercises 151
Summary 159
Chapter 7: Understanding Docker Compose 160
Overview of Docker Compose 160
Installing Docker Compose 162
Docker Compose Basics 163
Compose File Versioning 163
Version 1 164
Version 2 164
Version 3 164
Docker Compose File Reference 168
Services 168
build 168
context 169
image 169
environment/env_file 169
depends_on 170
image 171
ports 171
volumes 172
Restart 174
Docker Compose CLI Reference 175
build 175
down 175
exec 175
logs 176
stop 176
Docker Volume Exercises 176
Summary 191
Index 192