Meetup Docker : From Zero to Hero

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Meetup Veille Techno’
Docker : From Zero to Hero

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Principles
• Open to all : everybody’s welcome !
– Speakers
– Attendees
• Based on BBL
– A cutting edge technology
– A concept introduced in a customer
• There’s a groupe on Yammer !

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What is Docker ?

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• Docker is an ecosystem
• Based on 7 projects
– Engine
– Registry
– Kitematic
– Machine
– Swarm
– Compose
– Networking

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Why Docker ?

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The challenge

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The matrix from hell

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Cargo transport pre-1960

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Also a matrix from hell

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Solution : intermodal shipping container

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Docker is a container system for code

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Docker eliminates the matrix from hell

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Why developers care
• Build once... (finally) run anywhere
– A clean, safe, hygienic, portable runtime environment for your app.
– No worries about missing dependencies, packages and other pain
points during subsequent deployments.
– Run each app in its own isolated container, so you can run various
versions of libraries and other dependencies for each app without
worrying.
– Automate testing, integration, packaging...anything you can script.
– Reduce/eliminate concerns about compatibility on different platforms,
either your own or your customers.
– Cheap, zero-penalty containers to deploy services. A VM without the
overhead of a VM. Instant replay and reset of image snapshots.

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Why administrators care ?
• Configure once... run anything
– Make the entire lifecycle more efficient, consistent, and
repeatable
– Increase the quality of code produced by developers.
– Eliminate inconsistencies between development, test,
production, and customer environments.
– Support segregation of duties.
– Significantly improves the speed and reliability of continuous
deployment and continuous integration systems.
– Because the containers are so lightweight, address significant
performance, costs, deployment, and portability issues normally
associated with VMs.

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How does it work ?

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VMs vs containers

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Basics of a Docker system

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Changes and updates

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Docker projects

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DOCKER ENGINE

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• Namespaces
– User (To be implemented)
– Pid
– Net
– Ipc
– Mnt
– Uts

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• Cgroups
– Memory
– IO
– Cpu

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• Security
– AppArmor
– SELinux

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• Filesystems
– Aufs
– Btrfs
– Overlayfs
– Vfs
– Unionfs
– DeviceMapper

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• Dockerfile
– It’s like a makefile, but for your image
– File to build your image
– Plenty of keywords
• FROM
• RUN
• EXPOSE
• CMD
• …

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• Builds
– You have to build you container before running it
– Each command of your Dockerfile create a new
layer in you image

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• Variables
– You can pass environment variables to your runing
container

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• Ports
– You can expose ports from you container
– Without a port, a container cannot be reached
from the outside world

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• Links
– You an link docker containers together without
exposing ports
– Environement variables are predictable

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• Data containers
– Datas are not persisted in a container
– Datas sontainers can act like filesystem for
container
– They can be linked to containers

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• Volumes
– You can pass « anything » you want to a container
– Everything is file in a Linux system

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Demo

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DOCKER COMPOSE

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• Docker-compose is orchestration for Docker
• Based on yaml syntax
• TOSCA-like description

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Demo

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DOCKER SWARM

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• Docker swarm is native cluster system for
Docker
• One master, several slaves
• You can decide on which daemon you run
your apps
– Affinity
– Contraint

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Integration with Mesos

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DOCKER MACHINE

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• Used to provide Docker on fresh servers
• Lots of backend
– GCE
– AWS
– Virtualbox…
• Define environment variables easily
• Can create easy swarm cluster

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KITEMATIC

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• Kitematic is easy Docker on Mac
• Soon on Windows !

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REGISTRY

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• Docker image to provide stateless, highly
scalable server side application that stores and
lets you distribute Docker images
• Docker hub is public registry
• Great for CI/CD system

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• You can pull images from a private registry
– docker pull registry-1.docker.io/library/ubuntu

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• There is also managed registry from Docker
(not free) and licenced trusted registry

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LIBNETWORK

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• Native network in Docker
– Bridge
– SDN
– …
• Pluggable
• Isolated

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ORCHESTRATION

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Orchestration
• CoreOS
• Mesos
• Tutum
• Helios (Spotify)
• Kubernetes (Google)

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ECOSYSTEM

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Ecosystem
• Plennnnnnnty of projects
– Mini-PaaS
– Service discovery
– Orchestrator
– Launcher
• Everyone wants to be part of it !

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• Some really nice projects
– CoreOS
– Deis/Flynn
– Mesos
– Project Atomic
– Tutum
– Joyent Triton

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USECASES

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WHAT’S NEW ?
Dockercon June

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• OpenContainer project
– runc
– appc
• Docker on Windows native
• Pluggable addon

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