Docker Combat Guide
Docker Combat Guide
The Docker Guide for Software Developers
About the Book
A 138 Full-size DIN-A4 size pages in PDF format, DRM-free, super effective for Developers in order to learn by examples how to use Docker (80% of the book) and Docker SDK for Python 3 (20%).
Docker allows you to run identical environment in Development that in Production.
Docker allows you to work with images that are equal in all you Servers, are immutable. If one works bad, you simply kill that Container and start another, new.
Docker is also very System Administrator, DevOps and SRE oriented, as it requires a lot of Linux understanding, so if you're a Software Developer you may not know how powerful it is.
This guide is created specifically for Software Developers in Python, PHP, Java, that want to discover the power of Docker Containers with easy examples.
It covers creating Docker in workstations running:
- Ubuntu Linux
- Windows
- Mac OS X
This is not an extensive guide for System Administrators, DevOps and SREs.
This is a guide for Developers that want to start using Docker super quickly, by using examples from different projects. Also explains the usage of docker-compose and the Volumes.
The guide offers source code and the link to a repository, so you can just clone the code from there.
Updates
2021-11-24
Added the usage of a Software to reverse engineering an image and getting the original Dockerfile.
Added a typical copy and paste error to Troubleshoot section.
About the Author
Table of Contents
- Index...........................................................................2
- Dedication.......................................................................5
- Contact me.......................................................................6
- Receiving Free Updates.............................................................6
- If you’re not satisfied..............................................................6
- Conventions......................................................................7
- Knowing what version are you using – docker version....................................8
- Creating our first Container..........................................................9
- Our first Dockerfile..............................................................9
- Running our first Container based in a Dockerfile......................................9
- docker ps -a...................................................................10
- Running a Container that does something and exits......................................10
- Naming the images with -t (tagging)...............................................11
- docker images.................................................................11
- Running a container by its name..................................................13
- Have a cheap Ubuntu in your Windows or Mac with Docker...............................14
- docker ps.....................................................................19
- A simple web Hello World in Flask...................................................20
- A small CLI Python + MySql + Docker program as a sample..............................24
- Installing the MySql driver.......................................................25
- Dockerfile....................................................................26
- build_docker.sh................................................................27
- docker_run.sh.................................................................27
- docker_run_mysql.sh...........................................................28
- start.sql......................................................................29
- select_values_example.py.......................................................30
- Executing the Container.........................................................30
- Entering the Container and running the code.........................................32
- Tying together MySQL and a Python Menu with Object Oriented Programming.............32
- MySQL Library...............................................................33
- A Data Object: CarDO..........................................................34
- Queue Manager................................................................36
- Bonus.......................................................................42
- A Dockerfile with PHP, Apache and Catalonia Frameworks...............................43
- End of life of images............................................................44
- Create the Dockerfile...........................................................44
- The www.cataloniaframework.com.conf file.........................................47
- Stopping, starting the docker Service and creating the Catalonia image....................48
- Building with --no-cache option...................................................48
- Trying the Container working.....................................................49
- A base Dockerfile for your Jenkins deployments........................................51
- The EXPOSE instruction........................................................54
- Build the Container.............................................................54
- Run the Container displaying the password..........................................54
- Mapping the ports with -p........................................................55
- Configure Jenkins with Projects and Pipelines........................................58
- Why I propose you to use Python 3.8, at least, for your Internal Automation Tools in Docker
- Containers and Ubuntu LTS........................................................59
- Reliability and Maturity.........................................................59
- A sample Star Wars Python 3 Flask Applications........................................61
- MT Notation..................................................................66
- The Dockerfile for flask.........................................................66
- Installing PIP3 Requirements with pip3 install -r requirements.txt........................67
- Defining Environment Variables in the Container with ENV............................67
- File requirements.txt............................................................68
- build_docker.sh................................................................68
- Refreshing settings in a Docker immutable image with Python and Flask.....................69
- Smaller Images................................................................72
- Using Docker for Unit Testing......................................................73
- Using Docker for running a demo....................................................73
- Making a Container start automatically...............................................75
- Docker Volumes.................................................................76
- Launch a Container using a specific Volume.........................................77
- Docker compose.................................................................78
- Docker-compose with LAMP and PHPMyAdmin.......................................84
- Volumes.....................................................................87
- Exporting and Importing Docker Images..............................................88
- Docker container ls -a.............................................................89
- Cleaning what you don’t use: docker system prune......................................89
- DockerHub.....................................................................90
- Docker information...............................................................95
- Limit containers resources..........................................................96
- Limit the Memory of the Containers..................................................96
- Limit the CPU for the Containers....................................................96
- Adding an additional user, so you don’t have to run as root................................97
- Checking the logs from a Container.....................................................98
- Communicating with Docker Containers via Linux Signals and Python – docker kill...........98
- The Dockerfile................................................................99
- The dockersignal.py file.........................................................99
- build_and_run_docker.sh.......................................................100
- Reverse Engineering a Docker image to get the founding Dockerfile..........................102
- Troubleshooting...................................................................106
- Troubleshooting a failing Docker Container...........................................106
- Solving the problem when running an Alpine Docker Container: standard_init_linux.go:190: exec
- user process caused “no such file or directory”........................................106
- A typical copy and paste error......................................................108
- Using the Docker SDK.............................................................109
- MT Notation...................................................................109
- Installing the requirements........................................................109
- Videos........................................................................110
- Docker SDK from Python demo (7m 55secs).......................................110
- Docker-compose up demo (4m 10secs)............................................110
- Docker SDK Demo Python 3 program..................................................111
- Running the program.............................................................111
- List Containers (first version)......................................................114
- Run the Container ubuntu:latest with echo hello world (bonus)............................116
- Running a Container.............................................................117
- Reverse Engineering to get what I need..............................................119
- List of all Containers (pretty version)................................................122
- Stop a Container................................................................124
- Finding the prune equivalent.......................................................127
- Writing a Dockerfile and running the Container........................................129
- The docker-compose project.......................................................134
- Recommended Bibliography.......................................................138
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