The document provides an introduction to Docker, a technology for managing containers, highlighting its benefits such as portability, deployment ease, and security. It explains concepts like containerization and the tools that come with Docker, including Docker Engine, Compose, and Docker Hub for managing images. Additionally, it discusses the deployment process using Docker and emphasizes the use of orchestration tools like Docker Compose and Rancher OS.

1. Introduction to
Docker

2. Table of contents
• Who is it for?
• Status Quo
• What is a container?
• What is Docker?
• Docker toolbox
• Deployment with docker

3. Who is it for?
Devs DevOps
Any language
Any database
Any OS
Any crazy thing
Any server
Any OS
Any machine
Any cloud

4. Status Quo

5. What is a container?

6. So why should I care…
• Portability
• Deployment ease
• Gives control to the developers
• IT ops manage the same environment
• Security
• Lower cost

7. What is Docker?
It is the technology that manages containers
It is distributed via images hosted commonly on the
docker cloud
* images are small version of linux containing just one thing in particular
(rails application, ruby, postgres)

8. Welcome to the Matrix
Ruby on Rails ? ? ? ?
.NET ? ? ? ?
Java ? ? ? ?
Django ? ? ? ?
Developer
laptop
Another laptop QA Production

10. Welcome to the Matrix
Ruby on Rails Container Container Container Container
.NET Container Container Container Container
Java Container Container Container Container
Django Container Container Container Container
Developer
laptop
Another laptop QA Production

11. Demo time

12. Docker images
You can use pre-built images using the docker hub.
You can create your own images with your own code &
dependencies
hub.docker.com

13. A custom image - Dockerfile
FROM ruby:2.2.3
MAINTAINER Abraham Kuri <kurenn@icalialabs.com>
ENV PATH=/usr/src/app/bin:$PATH RAILS_ENV=production RACK_ENV=production
ADD . /usr/src/app
WORKDIR /usr/src/app
# Clean up un-needed files:
RUN mv config/database.yml.url-example config/database.yml
&& rm -rf .dockerignore Dockerfile tmp/cache/* tmp/pids/* log/* dev-entrypoint.sh
docker-compose.yml *.env .env examples
# Run bundle install
RUN bundle install --deployment --without development test
# Precompile assets for production
RUN DATABASE_URL=postgres://postgres:c@postgres.example.com:5432/blah
rake assets:precompile
EXPOSE 3000
CMD ["rails", "server", "-p", "3000", "-b", "0.0.0.0"]

15. The Docker Toolkit
• Docker Engine
• Compose
• Machine
• Kitematic
* https://www.docker.com/products/docker-toolbox

16. Docker compose
Helps you orchestrate multiple containers with ease:
• Create containers
• Run multiple containers
• Remove containers
It uses YAML to describe all our needs
* http://bit.ly/2b8wmaH

17. Deployment with Docker
As long as you have Docker running on the remote
server you will be able to run any image.
You can orchestrate containers with docker-compose
for production.
There are two big tools to manage not just containers
but hosts as well:
• Rancher OS (free, open source)
• Docker registry (paid, docker license)
* https://github.com/kurenn/docker-rails

18. Thanks!
Questions?
@kurenn