Introduction to Docker

Jan 21, 201416 likes14,662 views

Docker allows building, shipping and running applications as lightweight containers. It provides an isolated runtime environment for applications and their dependencies, allowing developers to easily deploy their code in a consistent manner across different environments. Operations teams also benefit from Docker as it standardizes the application lifecycle and deployment process, improving efficiency, quality and speed of continuous integration and deployment. Docker containers are more lightweight than virtual machines and provide better performance, density and portability.

Introduction to
Docker
Containerization is the new virtualization

who

engineer and operations chap
open source chap
funny accent
(photo by Jennie Rainsford)

other matters
author
http://www.jamesturnbull.net
hack-n-slash developer
https://github.com/jamtur01
pontification
http://www.kartar.net

So what is Docker?
Container virtualization
Build, pack, ship and run applications as containers
Build once, run in many places
Isolated and content agnostic

So why should I care?
Easy (and lightweight!) way to model reality
Devs care about their app, Ops cares about the containers
Golden images without the overhead

Why developers care...
A clean, safe, hygienic and portable runtime environment
No worries about missing dependencies, packages and other pain
points
Run each app in its own isolated container, so you can run various
versions of libraries and other dependencies
Automate testing, integration, packaging
Reduce/eliminate concerns about compatibility on different platforms

Why operations care...
Make the entire lifecycle more efficient, consistent, and repeatable
Increase the quality of code produced by developers
Eliminate inconsistencies between development, test, and production
environments
Support segregation of duties
Significantly improves the speed and reliability of continuous
deployment and integration

So why not VMs or Cloud?
Speed of deployment
Portability
Size aka cached layering FTW
Density & Performance
Cost

Technology Stack
Runs (for now) on most Linux distros
cgroups and namespacing
Device Mapper or AUFS or vfs or <pluggable in future>
lxc or <pluggable in future>

Building Docker images with a
Dockerfile
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Building the image
$sd dce bid-=jmu0/pce".
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Pushing the image
$sd dce ps jmu0/pce
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Running the container
$sd dce rn- - 8 - /a/w/yp jmu0/pce
uo okr u d p 0 v vrwwmap atr1aah2

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