docker first steps

First Steps

What’s Docker?

• API to provide lightweight containers• Opensource platform• Run process isolated in the same host• It helps to deploy, ship, test, etc. in a fast way

How it works

How it works

How it works

• Dockerfile: set of instructions to build a docker image. Every instructions creates a new layer and it is assigned to a hash, like a git commit

• Docker Hub: Central repository where docker images are stored

Docker is NOT a Virtual Machine

Docker vs. Virtual Machines

Virtual Machine

Docker vs. Virtual Machines

Docker containers

Advantages

• High level abstraction for containers• Fast to create images• Fast to deploy• Reduce time between development and

deployment• Possible to have several environments isolated

in the same host

Example

So… Docker is AWESOME!!!!111

Well… Not that awesome…

Disadvantages

• Networking limitations• No support for IPv6• Uses NAT• Insecure (Trust Docker Hub)• No support for old kernels• Not easy to debug

And more… http://www.boycottdocker.org

Docker in Production

Tools

• CoreOS, RancherOS, boot2docker• Kubernetes• Docker Machine• Docker Compose• Kitematic

Questions?

Thank you!

Julian Camargo@juliancamargo

jcamargo2@gmail.com