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What is a Container?

  • A stand-alone executable package that contains:

    • Code
    • Runtime
    • System tools
    • Libraries
    • Settings

  • Isolates software from its surroundings

How do they differ from a VM?

Layers

What do they isolate?

  • Some examples:
    • Processes
    • File system
    • Shared memory
    • Network
    • Resource (CPU etc.)

What is Docker?

  • A container platform
  • A set of tools
  • A client and a daemon
  • Other options (rkt, clearcontainer etc.)

Create a node js image

  • An image is a snapshot of the filesystem
  • Used to run a container
  • Example Dockerfile
FROM alpine
RUN apk update && apk add nodejs
  • Build the image
docker image build -t tr/presentation .

Run a container

docker container run -it --rm \
	tr/presentation node

... or pull one

docker image pull node

Create a simple application

  • Review the files in the repo, js source & Dockerfile
  • Build the image
docker image build -t \
	travelrepublic/presentation-docker-node
  • Run the container
docker container run -it --rm \
	-p 9000:8080 \
	-e ENVIRONMENT=test \
	travelrepublic/presentation-docker-node

A simple CI process

CI

Demonstrate CI process

  • Review the .travis.yml file
  • Change the node version to node:6 and push to the repository
  • Keep an eye on travis, pull the newly built image and run locally