Jhonathan Howard Falcutela (Kaii)
Imaginative Dreamer & Hack Artist
Hi, I'm Jhonathan
PHP, Python and JS
Intro to Docker
Docker is an open-source engine that automates the deployment of any application as a lightweight, portable, self-sufficient container that will run virtually anywhere.
- All languages
- All databases
- All O/S
- any distro (as long as its ubuntu/debian)
-
any cloud (as long ay they dont ship with their customers crappy kernels)
- any machine(physical,virtual...)
- recent kernels
- LESS Overhead
- MOAR! Consolidation
- MOAR! Agility
- LESS Cost
Docker Components
( Daemon,Client and Registry )
Daemon (docker -d)
Receives and processes commands to manage lifecycle of containers
Client (docker <command>)
Accepts commands from the user and communicates back and forth with Docker daemon.
Registry (https://registry.hub.docker.com)
archive and directory for user supplied Docker images
Docker Elements
( Dockerfile,Images and Containers )
Dockerfile
skeleton/blueprint of building images
Images (docker images)
templates where containers are build from
Registry (docker registry)
docker image storage
Containers (docker ps)
isolated env that runs your apps
How docker works?
Lets do some examples!
// Outputs a Hello World text
$ sudo docker run ubuntu:14.04 /bin/echo 'Hello World'
Hello World
// run an interactive ubuntu terminal shell
$ sudo docker run -t -i ubuntu:14.04 /bin/bash
root@containername:/#
// daemonize - run as background
$ sudo docker run -d ubuntu:14.04 /bin/sh -c "while true; do echo hello world; sleep 1; done"
1e5535038e285177d5214659a068137486f96ee5c2e85a4ac52dc83f2ebe4147
Virtual Machine
vs
Docker Containers
VM
Containers
- Emulates hardware and OS
- Eats lots of storage space
- Heavy on resources
- Isolates your app but shares the same resource and OS with the host
- Lightweight
- Portable
- Social!
Why Developers care?
- A clean, safe, hygienic and 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?
Build once, run anywhere... Yey!
Docker interests me because it allows simple environment isolation and repeatability. I can create a run-time environment once, package it up, then run it again on any other machine. Furthermore, everything that runs in that environment is isolated from the underlying host (much like a virtual machine). And best of all, everything is fast and simple.
-Gregory Szorc, Mozilla Foundation
http://gregoryszorc.com/blog/2013/05/19/using-docker-to-build-firefox/
Tools
Orchestration
- Fig
- Shipper
- Centurion
- Helios
- Kubernetes
Web Interface
- DockerUI
- Shipyard
PAAS
- Flynn
- Deis
- Dokku
The End...
Intro to Docker
By Jhonathan Howard Falcutela (Kaii)
Intro to Docker
A Malayan College Campus Devcon Talk
