This document provides an introduction and overview of Docker and containers. It discusses what containers are, how they differ from virtual machines, and how Docker works. Key points covered include common Docker commands, the Docker architecture, building images with Dockerfiles, and using Docker Compose to run multi-container applications. The benefits of containers for streamlining deployment and rapid scaling are also highlighted.

1. Speaker
Introduction to Docker and
Containers

2. Agenda of the Day
• Introduction to Docker
• What and Why of Containers?
• Understanding Docker Lifecycle
• Building docker images using Dockerfile
• What is Docker Compose?

3. Docker
Leading open-source containerization
platform
Supported natively in Azure
Docker containers wrap up a piece of software
in a complete filesystem that contains
everything it needs to run: code, runtime,
system tools, system libraries – anything you
can install on a server. This guarantees that it
will always run the same, regardless of the
environment it is running in

4. Docker Architecture

5. Docker CLI
• Command-line interface for Docker, available for Linux, OS X,
and Windows (available separately or as part of Docker Toolbox)

6. Running a Container
docker run -i -t ubuntu /bin/bash

7. Containers
Lightweight alternative to virtual machines
Smaller, less expensive, faster to start up, and self-contained
Host Operating System
Hypervisor
Guest OS
Libraries
App
Guest OS
Libraries
App
Guest OS
Libraries
App
Operating System
Container Engine
Libraries
App
Libraries
App
Libraries
App
Virtual Machines
Containers

8. Processes in containers are isolated from other
containers in user space, but share the kernel with the host and other
containers
Differences in underlying OS and infrastructure
are abstracted away, streamlining “deploy anywhere” approach
Containers can be created almost instantly, enabling rapid scale-
up and scale-down in response to changes in demand
Containers

9. Containers

10. Semantics

11. Common Docker CLI Commands
docker run - Use an image to run a container
docker pull - Pull an image from a registry
docker build - Build a Docker image
docker exec - Execute a command in a container
docker stop - Stop a running container
docker images - List available Docker images
docker ps - List running Docker containers

12. Running Containers on Linux
Container A
App 1
Container B
App 2
Container C
App 3
Linux-Based Host Operating System
Infrastructure
Container A
• Isolation from kernel-level container support
• Containers are started from images
Container B
• Binaries depend on specific OS/kernel
Container C
• No guest OS needed

13. What is Docker?
Server Docker Daemon
Rest API
Client Docker CLI Manages
• Container
• Network
• Image
• Data Volumes

14. Container Anatomy
• Container images
• The container
• Container tooling
Container layer (Thin r/w)
Your Application
Updates/Patches/Additional tools
Frameworks and Tools
Base OS layer

15. Dockerfile to Create Images

16. What is Docker Compose?
• Used to instance multiple containers
• Can reference Dockerfiles
and/or images
• Paired with docker-compose.yml
Web Frontend
SQL Server on Linux
Web API Redis Cache

17. Docker-Compose Structure
Version: ‘3.0’
Services:
service-name:
image: docker-image
image: how to build
depends on:
-other services
environment:
-key/value pairs
ports:
-port mapping
network:
network-name:
volumes:
volume-name:

18. CI/CD for Containers

19. DevOps flow – CD push to cluster