Intro to Docker

[RaoOfPhysics]

Date: 27 May 2016 Time: 17:00 CEST (UTC +02) Location: 40/R-D10 Vidyo for remote participants (just click on the link to proceed): CERN_OpenScience Session format: Work-Along

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Lesson guide: @tiborsimko Lesson materials: https://github.com/CERNStudyGroup/cernstudygroup.github.io/issues/48#issuecomment-224649345 More info: http://tiborsimko.org/tag/docker.html

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If you haven't done so yet, introduce yourself (#26) and list your project(s) (#24).

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Participated in person:

• @RaoOfPhysics
• @jacquerie
• @xchen101
• @Kjili
• ??
• ??

Participated over Vidyo:

• @tpmccauley
• @andrewjohnlowe
• @pseyfert

[RaoOfPhysics]

Confirming date and time!

[mickypaganini]

Where can I find the material that was used during this tutorial?

[tiborsimko]

@mickypaganini The tutorial was an interactive code-along session style, so there is no formal material. Although part of the tutorial can be followed by reading my old blog posts on docker; see references below.

Here is a rough "table of contents" of what we touched:

• Introduction
  • Virtual Machines vs Container technology differences
  • Docker image registry (docker search python)
  • Pulling an image (docker pull python:2.7)
  • Using image locally (docker run -i -t --rm python:2.7 /bin/bash)
  • Working with images (docker image, docker rmi)
  • Images vs Containers
  • Working with containers (docker ps, docker exec, docker rm)
• Simple web application
  • Example: "Hello World" Python web application http://tiborsimko.org/docker-for-python-applications.html
  • Automatising creation of docker images (Dockerfile)
  • Optimising docker images: RUN commands and image layers
• Composed web application
  • docker-compose: starting several containers and inter-linking them (web, db, cache, mq...)
  • Example: limiting web page hits https://github.com/inveniosoftware/flask-ratelimiter/
  • Building app (docker-compose build)
  • Running app (docker-compose up -d, docker-compose ps)
  • Accessing logs (docker-compose logs)
• Starting containers on remote machines
  • old low-level approach http://tiborsimko.org/docker-on-cern-openstack.html
  • new docker-machine approach; create VM on OpenStack
  • we have seen Docker stack (docker, docker-compose, docker-machine); there are alternative orchestration techniques, Kubernetes, OpenStack Magnum