This document provides an introduction and overview of Docker. It discusses the motivation for using Docker, which includes only needing to build an app once and getting consistency between testing and production environments. It then provides instructions for installing Docker on different operating systems. Several Docker concepts and terms are defined, like images, containers, the Docker engine, Docker Hub, repositories, and more. Basic Docker commands are listed and explained. The Dockerfile is introduced as a way to build images. Key Dockerfile commands are defined. Docker Compose is presented as a tool to run complex multi-container apps with one command. Common Docker commands are provided at the end.

1. Docker 101

2. Mirza Nafis Faysal
Software Engineer, Furqan Software
github.com/NafisFaysal
twitter.com/NafisFaysalMir

3. Motivation
● You only have to build the app once. Because a Docker app runs inside a container, and the
container can run on any system with Docker installed, there is no need to build the app and
configure it for multiple types of hardware platforms or operating systems where it will run. You
only have to build it once for Docker.
●
● You get greater consistency between testing environments and production environments.
When doing development with Docker, you test your app inside a container, and you ship it inside
a container. That means the environment in which you test is identical to the one in which the app
will run in production. As a result, developers can have much more confidence that end users
won't experience problems that the QA team missed when it was testing the app.
Session 1

4. Installing Docker on X Y Z -OS
Super Simple :
https://docs.docker.com/docker-for-mac/install/
https://docs.docker.com/engine/installation/linux/doc
ker-ce/ubuntu/

6. Docker.com Says
Docker is an open platform for developers and sysadmins
to build, ship, and run distributed applications.

7. Traditional VM Docker
They’redifferent,notmutuallyexclusive

9. Fancy Docker Terminology
Docker Image
Docker Container
Docker Engine
Docker Hub
Session 2

10. Docker Git
Image saved state Commit
Container used for local execution Checkout
Repository collection of commits Repository
Docker Hub popular remote server Github

11. Basic Docker Commands

12. $ docker pull
$ docker images
$ docker run –d –p –-name COMMAND
$ docker ps
$ docker stop containerName (or <container id>)
$ docker rm containerName (or <container id>)

13. Dockerfile
Series of commands to build an image

14. Command Description
ADD Copies a file from the host system onto the container
CMD The command that runs when the container starts
ENTRYPOINT
FROM The base image to use in the build. This is mandatory and must be the first command in the file.
ENV Sets an environment variable in the new container
EXPOSE Opens a port for linked containers
MAINTAINER An optional value for the maintainer of the script
ONBUILD A command that is triggered when the image in the Dockerfile is used as a base for another image
RUN Executes a command and save the result as a new layer
WORKDIR Set the default working directory for the container

15. Docker Compose : Get an app running in one command.
Session 3

16. ‘’Compose is a tool for defining and running complex
applications with Docker. With Compose, you define
a multi-container application in a single file, then
spin your application up in a single command which
does everything that needs to be done to get it
running.’’

17. long story short

18. MOST COMMON DOCKER COMMANDS
Stop all containers: docker kill $(docker ps -q)
Remove all containers: docker rm $(docker ps -a -q)
Remove all docker images: docker rmi $(docker images -q)
container's IP address: docker inspect -f
'{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id

19. Question ?

20. Happy Weekend