This document discusses Docker, an open-source container platform. It begins with a quick survey asking how familiar people are with Docker. It then defines Docker as allowing applications to be packaged into standardized units called containers that are portable and self-sufficient. The document outlines some benefits of containers like speed and small footprint. It compares containers to virtual machines and explains key components that enable containers like namespaces and control groups. Finally, it provides some basic Docker commands and examples of using Docker to package and run applications.

1. July 14, 2014
Kaushal Kishore [ kaushal@osscube.com ]
Sr. Sofware Engineer [OSSCube]

2. Quick Survey

3. 2
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 ?

4. What is Docker
?

5. 2
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.”

6. 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.

7. Why Containers ?

8. 2
Cargo Transport Pre - 1960

9. 2
Intermodal Shipping Container

10. 2
Docker is a Code Shipping Container

11. build once,
run anywhere

12. configure once,
run anything

13. 2
Why Container ?
• Speed: Boots in seconds
• Footprint: 100-1000 containers on one machine. Small disk
requirements

14. 2
What is Container ?
“Containers are to
Virtual Machines as
threads are to
processes.”

15. 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

16. 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

17. 2
Docker Engine

18. 2
Docker Vs Virtual Machine

19. 2
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

20. 2
Installations of Docker
“We can Install Docker on the listed platforms”

21. 2
Installations : Ubuntu Linux

22. 2
Installations : Binaries

23. 2
Installations : Vagrant

24. Basic Examples/
Commands

25. 2
Basic Commands

26. 2
Classic: “Hello World”

27. 2
Detached mode

28. 2
Containers Vs Images

29. 2
Containers Vs Images

30. 2
Public Index & Network

31. 2
Creating your 1st app: “The interactive way”

32. 2
Creating your 1st app: “The boring way ”

33. 2
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.

34. 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.

35. Questions ?

36. Thank you!
Email : kaushal@osscube.com