Docker - Getting Started

1. Docker - Getting
Started
Quick Dev Notes

2. Hi, I’m Gaurav Gahlot.
Quick Dev Notes
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3. Agenda
Applications Run Businesses
Virtualisation
Hello Containers!
Docker
Docker Use Cases
Docker Image
Docker Registry

4. Applications Run Businesses

5. Virtualisation
The Hypervisors
• Type 1 - Bare Metal
• Type 2 - Hosted

6. Virtualisation
Server
VM VM VM VM
OS OS OS OS
App App App App
Operating System

9. Hello Containers!
OS Virtualisation
Consists of an entire runtime system
Light weight
Ultra fast
Enhances Reliability
Portable
Improve resource utilisation

10. VM vs Container Architecture
Server
VM VM VM VM
OS OS OS OS
App App App App
Server
Operating System
App App App App
Free Space
(ready for
use)
Container Engine

11. What is Docker?
Docker != Containers
Docker is:
• Docker, Inc. - the company
• Docker - the container runtime
• Docker - the open source project (now called Moby)
Docker runs on Linux, Windows and Mac OS

12. Docker Use Cases

13. Docker Architecture

14. Docker Image
An image is a stopped container
Built out of a manifest file - Dockerfile
Does not have a state and it never changes
Contains a union of layered filesystem
Tags (default: latest)
Dockerfile Image Container
Build Run

15. Dockerfile
FROM sets the Base Image for subsequent instructions
ARG defines a variable that can be passed at build-time
LABEL adds metadata to an image
ENV sets the environment variables
WORKDIR sets the working directory for RUN, CMD, ENTRYPOINT, COPY and ADD
CMD provides defaults for an executing container; one per Dockerfile
RUN executes a command in a new layer
COPY copies files or directories from local source to container filesystem
ADD copies files, directories or tar files from local/remote source to container
filesystem
EXPOSE specifies the ports that a container listens on
ENTRYPOINT allows to configure a container to run as an executable

16. Docker Registry
Registry - collection of repositories
Repository - collection of images
Image - layered filesystem with tags
Registry - Public or Private

17. Docker Registry

18. What’s Next?
Dive Deep:
• Containers
• Images
• Containerisation
Named Volumes
Networking
Docker Compose
Docker Swarm

19. Thank you!
Any Questions?

20. Stay Connected!
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