Docker: What, why, and how?

Andrew T. Baker

Software developer

Blog:

http://www.andrewtorkbaker.com

Twitter:

@andrewtorkbaker

Docker Hub:

atbaker

About you

Today

What is Docker?
Docker in practice
Docker's past, present, and future
Using Docker today
Docker & Continuous Delivery
Trying it yourself
Questions

"It worked in my
development environment"

The promise of Docker:

Build once, run anywhere

What is Docker?

Virtualization tool?

Configuration manager?

VM manager?

cgroups?

LXC?

libvirt?

go?

Docker.com says

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

Less portable, minimal overhead

Most portable,
lots of overhead

Manual
configuration

Traditional VMs

CM tools

Docker

Docker in practice

Containers

How you run
your application

Images

How you store
your application

Dockerfiles

# Set the base image to Ubuntu
FROM ubuntu

# Update the repository sources list
RUN apt-get update

# Install MongoDB package (.deb)
RUN apt-get install -y mongodb-10gen

# Create the default data directory
RUN mkdir -p /data/db

# Expose the default port
EXPOSE 27017

# Default command to start the database
CMD ["usr/bin/mongod", "--port 27017"]