July 14, 2014

Kaushal Kishore [ kaushal@osscube.com ]

Sr. Sofware Engineer [OSSCube]

Quick Survey

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Quick Survey

• How many people have heard of Docker before this Meetup ?• How many people have tried Docker ?• How many people are using Docker in production ?

What is Docker

?

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What is Docker ?

“Docker is an open-source engine to easily create

lightweight, portable, self-sufficient containers

from any application. The same container that a

developer builds and test on a laptop can run at

scale, in production, on VMs, OpenStack cluster,

public clouds and more.”

2

Origin of Docker

• Docker is a rewrite of similar code that currently powers the

dotCloud PaaS

• Original version written in Python (like dotCloud PaaS), now

written in Go

• It’s a young project , but with a huge community.

Why Containers ?

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Cargo Transport Pre - 1960

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Intermodal Shipping Container

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Docker is a Code Shipping Container

build once,

run anywhere

configure once, run

anything

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Why Container ?

• Speed: Boots in seconds

• Footprint: 100-1000 containers on one machine. Small disk

requirements

2

What is Container ?

“Containers are to Virtual Machines as

threads are to processes.”

2

What is container in docker?

• LinuX Containers (LXC

• Kernel namespaces (ipc, uts, mount, pid, network and user)

• Chroots (using pivot_root)

• Apparmor and SELinux profiles

• Kernel capabilities

• Control groups (cgroups)

• AUFS or replacement in 0.7 version and later

2

LinuX Containers (LCX)

• Let’s your run a Linux system within another Linux system

• A container is a group of processes on a Linux box, put together

is an isolated environment

• From the inside, it looks like a VM

• From the outside, it looks like normal processes

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Docker Engine

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Docker Vs Virtual Machine

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In the first 6 months

• 6000+ Github stars

• 150+ Contributors

• 50,000+ docker index pull

• 100’s of projects built on top of Docker

– UIs (DockerUI, Shipyard, Dockland...)

– Open Source PaaS (DEIS, Flynn, Dokku...)

– Continuous Deployment (Strider...)

• 1700’s Dockerized applications on Github

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Installations of Docker

“We can Install Docker on the listed platforms”

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Installations : Ubuntu Linux

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Installations : Binaries

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Installations : Vagrant

Basic Examples/Commands

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Basic Commands

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Classic: “Hello World”

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Detached mode

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Containers Vs Images

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Containers Vs Images

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Public Index & Network

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Creating your 1st app: “The interactive way”

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Creating your 1st app: “The boring way ”

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Container Lifecycle

• docker run - creates a container.

• docker stop - stops it.

• docker start - will start it again.

• docker restart - restarts a container.

• docker rm - deletes a container.

• docker attach - will connect to a running container.

• docker wait - blocks until container stops.

2

Container Info

• docker ps - shows running containers.

• docker ps -a - shows running and stopped containers.

• docker inspect - looks at all the info on a container (including IP

address).

• docker logs - gets logs from container.

• docker events - gets events from container.

• docker port - shows public facing port of container.

• docker top - shows running processes in container.

Questions ?

Thank you!Email : kaushal@osscube.com