Presented this to the students of Vellore Institute of Technology on 18-March-2019.

1. Introduction to Docker

2. $whoami
Principal Development Engineer at DellEMC
1st half of my career was in CGI & VMware
2nd half of my career has been in System Integration Testing
Docker Captain (since 2016)
Docker Bangalore Meetup Organizer ( 7600+ Registered Users)
Founder of DockerLabs
Ajeet Singh Raina
Twitter: @ajeetsraina
GitHub: ajeetraina

3. - My Personal Blog website
- Built on WordPress, Hosted on One.com
- Recently Completed 4th Year
- 175+ blogs on Docker | Kubernetes | Cloud
- Monthly close to 1 million visitors per month
$curl www.collabnix.com

4. - A Shift from Monolithic to Microservices Architecture
- Traditional Software Development Workflow(with/without Docker)
- What is Docker? What problem does it solve for us?
- Docker Vs Linux Containers
- Docker Vs Virtual Machine
- Docker Underlying Technology
- Running Your First Docker Container - Demo
- Using Docker: Build, Ship and Run Workflow - Demo
- Building Your Docker Image using Dockerfile - Demo
Agenda – Morning Session

5. - Introduction to Docker Networking
- Introduction to Docker Swarm
- How Docker Swarm Mode works?
- Running Web Application using Docker Swarm Mode - Demo
- Test Drive Docker & Docker Swarm on Raspberry Pi – Let’s make it happen !
- How to contribute towards Docker Community?
Agenda – Afternoon Session

6. A Shift from Monolithic to
Microservice Architecture

8. A Close Look at Monolithic
Browser
Client
App
Storefront UI
Module
Catalog
Module
Reviews
Module
Orders
Module
HTML
REST/JSON
Database

9. A Close Look at Monolithic
Browser
Client
App
Storefront UI
Module
Catalog
Module
Reviews
Module
Orders
Module
WAR
Tomcat
HTML
REST/JSON
Database

10. Simple to Develop, Test, Deploy & Scale
- Simple to develop because of all the tools and IDEs support to that kind
of application by default.
- Easy to deploy because all components are packed into one bundle.
- Easy to scale the whole application.
Benefits of Monolith

12. Successful Application keep growing..
- Very difficult to maintain
- One component failure will cause the whole system to fail.
- Very difficult to understand and create the patches for monolithic applications.
- Adapting to new technology is very challengeable.
- Take a long time to startup because all the components need to get started.
Disadvantages of Monolith

13. Today
- Apps are constantly developed
- Built from loosely coupled components
- Newer version are deployed often
- Deployed to a multitude of servers
Customer/
Clients/
Users
Data
Storage
Data
Storage
Data
Storage

14. Microservice Architecture
Catalog
Service
Reviews
Service
Order
Service
…
Service
Catalog
Database
Reviews
Database
Order
Database
…
Database
API
Gateway
Storefront UI
Browser
Mobile
Device
REST
REST
HTML
REST

15. - Can scale independent microservices separately. No need to scale
the whole the system
- Can use the latest technologies to develop the microservices.
- One component failure will not cause entire system downtimes.
- When developing an overall solution we can parallel the
microservices development task with the small teams. So it helps to
decrease the development time.
Benefits of Microservices

16. Once upon a time…a Software Stack

17. Now much more distributed & complex…

20. Let’s start with simple analogy..
You are a shipping company

21. Let’s start with simple analogy..
The customer asked you to ship potatoes

22. Let’s start with simple analogy..
Hence, you said “BIG YES” and you fitted it
with pianos

23. Let’s start with simple analogy..
Another customer asked to ship bottles of
liquor

24. Let’s start with simple analogy..
Things goes really mess up when liquor spill
over your pianos

25. Let’s start with simple analogy..
Your employed crew is worried how to
handle all these differences

26. Problem Statements..
- Size of goods
- Forms of goods
Requirement is to keep it safe and stable during the transport

27. What shall we do?

28. An Effort to solve the problem Complexity

29. Every possible good to ship X Every Possible way to Ship

30. Enter….Internodal Container

31. That’s what Docker is all about..

32. What is Docker and what
problem does it solve?

33. Docker is an open software development
platform which help you to Build, Ship and
Run your applications along with all its
dependencies allowing portability among
any system ranging from small IoT device
like Raspberry Pi, Desktop, Workstation,
Server to the Cloud.

34. • Standardized packaging for
software and dependencies
• Isolate apps from each other
• Share the same OS kernel
• Works for all major Linux
distributions
• Containers native to Windows
Server 2016 & 1809
What is Docker?

35. What is Docker?
Refers to several things in 2019
 Docker as a “Company”
 Docker as a “Product”
 Docker as a “Platform”
 Docker as a “CLI Tool”
 Docker as a “Computer Program”

36. Docker Presence

37. History of Docker
 A Company as well as Product – 6 Years Old company
Developed by DotCloud Inc. ( Currently Docker Inc.)
A Framework they built their PaaS upon.
Released it as open source 3 and 1/2 years back
Cross-platform nature and friendliness towards System Admin and Developers
Possible to set up in any OS, be it Windows, OSX, Linux, Solaris - It work the same
way
 Guaranteed to run the same way - Your development desktop, a bare-metal server,
virtual machine, data center, or cloud

38. Today Docker runs on

39. Docker Vs Linux Container

40. Docker hold just 5% of whole Container
Code

41. Docker Vs Linux Container
Docker Linux Containers
Implementation of kernel-sharing applications
isolation technology which is not VM.
Popularly refers to LXC. It delivers containers
that include a complete Linux system, much like
VM, with its own file system, networking and
multiple applications
Encourages applications to be broken down
into their separate processes and provides
tools to do that. Its granular approach
Uses an init system that can manage multiple
processes. Entire app runs as one.
Docker used LXC in the past but replaced it
with Containerd. Containerd is used for single
application containers
LXC is able to run multiple applications inside
system containers

42. Traditional Software
Development WorkFlow
(without Docker)

48. Traditional Software
Development WorkFlow
(with Docker)

52. Docker Vs VM

53. Docker Containers are NOT VMs

54. Virtual Machine

55. Containers

56. Docker Container Vs VM

57. Comparing Docker & VM
Virtual Machines Docker
Each VM runs its own OS Container is just a user space of OS
Boot up time is in minutes Containers instantiate in seconds
VMs snapshots are used sparingly Images are built incrementally on top
of another like layers. Lots of
images/snapshots
Not effective diffs. Not version
controlled
Images can be diffed and can be
version controlled. Docker hub is like
GITHUB
Cannot run more than couple of VMs
on an average laptop
Can run many Docker containers in a
laptop.
Only one VM can be started from one
set of VMX and VMDK files
Multiple Docker containers can be
started from one Docker image

58. Docker Vocabulary

61. Image Layers
Kernel
Alpine Linux
Install Python and Pip
Upgrade Pip
Copy Requirements
Install Requirements
…

62. Basic Docker CLIs
Pulling Docker Image
$ docker pull ajeetraina/hellowhale
Listing out Docker Images
$ docker image ls
Running Docker Containers
$ docker run –d –p 5000:5000 –-name hellowhale ajeetraina/hellowhale
Stopping the container
$ docker stop hellowhale (or <container id>)

63. Using Docker – Build,
Ship & Run WorkFlow

64. Build. Ship. Run.

65. - Create DockerHub Account(if not completed)
- Open https://play-with-docker.com
- Hello World Example
- Build Your First Docker Image & Push it to DockerHub
Demo

66. Building Docker Containers &
Microservices

67. Introducing Dockerfile
Series of instructions to build Docker Images

68. Dockerfile – Example

69. Each Dockerfile creates a Layer
69
Kernel
Alpine Linux
Install Python and Pip
Upgrade Pip
Copy Requirements
Install Requirements
…

70. - Building Nginx Server using Dockerfile
Demo

71. Compose is a tool for defining and running multi-container Docker applications
Docker Compose

72. Reference
 https://github.com/collabnix/dockerlabs
 https://docs.docker.com
 http://www.collabnix.com

74. - Introduction to Docker Networking
- Introduction to Docker Swarm
- How Docker Swarm Mode works?
- Running Web Application using Docker Swarm Mode - Demo
- From Local Desktop to Cloud in 5 Minutes - Demo
- Test Drive Docker & Docker Swarm on Raspberry Pi – Let’s make it happen !
- Demonstrating Cool Docker Projects - Demo
- 5 Tips to become Docker Captain
- How to contribute towards Docker Community?
Agenda – Afternoon Session

75. Introduction to Docker
Networking

76. Why do we need Docker networking?

80. Getting Started with
Docker Swarm

81. Let’s start with Single Docker Host
A Docker Host
http://collabnix.com/getting-started-with-docker-swarm/

82. You start adding more hosts..
http://collabnix.com/getting-started-with-docker-swarm/

83. But Wait..
Service
Discovery
Scalability
High
Availability
Failure
Management
Scheduling
Rolling Updates
Container Security

84. Docker Swarm comes for rescue..
http://collabnix.com/new-docker-1-12-comes-with-built-in-distribution-orchestration-system/

85. What is Swarm Mode?
• A swarm consists of one or more nodes: physical or virtual machines running Docker Engine.
• It was introduced first under Docker 1.12 release.
• It enables the ability to deploy containers across multiple Docker hosts, using overlay networks for
service discovery with a built-in load balancer for scaling the services.
http://collabnix.com/docker-1-12-swarm-mode-under-the-hood/

87. Building Docker Swarm
Topology

92. Introduction to Docker
Networking

102. Building Swarm Cluster on Raspberry Pi
Running Portainer on Raspberry Pi
Demo

103. Thank You