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Introduction to Docker

Shailendra Chauhan

Microsoft MVP, Technical Consultant and Corporate Trainer

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• Multi-Dimensional Evolution of Computing

• What is Container?

• Container Platforms

• Why Containers?

• Virtual Machines vs Containers

• Containers and VMs together

• Docker Basics

• Docker for .NET Applications

• Docker Engine Architecture

Agenda

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Evolution of Computing

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• A container is a software that contains an application code and all its dependencies.

• Enables an application to run quickly in an isolated environment.

• Provide smooth migration from one computing environment to another.

• Share the same OS kernel

• Works with all major Linux & Windows Server

What is Container?

Source : www.docker.com

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Container Platforms

Linux Containers (LXC) Docker (Docker Swarm) Kubernetes RedHat OpenShift DC/OS

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•Quickly create ready-to-run packaged

applications, low cost deployment

• Automate testing, integration and

packaging

• Reduce/eliminate platform

compatibility issues

• Supports microservices development

Why Containers?

• Improve speed and frequency of releases, reliability of deployments

•Makes app lifecycle efficient, consistent and repeatable-configure once, run many times

• Eliminate environment inconsistencies between dev, test, and production

• Provide Scalability on demand

For Developers For Administrator

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Virtual Machines vs. Containers

VMs

Source : www.docker.com

Containers

Source : www.docker.com

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• Hardware-level virtualization

• Fully isolated

• Isolated OS

• Having its own kernel

• Slower in start-up

• Many startup process

• Upfront resource allocation

Virtual Machine vs. Containers

• OS-level virtualization

• Process-level isolation

• Isolated processes/filesystems

• Host machine kernel is used

• Faster in start-up

• Single Start-up process

• No upfront resource allocation

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Containers and VMs together

Source : www.docker.com

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• A light weight, open and secure platform for developing, shipping and running applications using container technology.

• Provides Container solutions for developers, architects, DevOps, and IT People.

• Run on most Linux distributions, Windows and Mac OS.

• Supported by most of cloud providers like AWS, Azure, Google etc.

• Provide Dev/Test, CI and DevOps platform for many use cases.

Introduction to Docker

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• Infrastructure Cost Savings

• Standardization and Productivity

• Isolation

• Security

• Makes app lifecycle efficient and consistent

• Continuous Deployment and Testing

• On Demand Scaling

• Multi-Cloud Platforms Support

Docker Benefits

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Docker Desktop

• An application for Mac and Windows to build production-ready container applications

• Enables to build and test Linux & Windows based applications at local machine

• Available in two editions:

• Desktop Community

• Desktop Enterprise

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Docker For Developers

Applications(.NET Core, Java, JS etc.)

Windows Server

Linux

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Docker For .NET Applications

.NET Core

Windows Nano Server

Linux

.NET 3.5 & .NET 4.x Windows Server Core

Legacy Applications

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• Docker File

• Docker Image

• Docker Container

• Docker Registry

Docker Basics

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Docker File

Dockerfile

docker build

• A simple text file that contains commands to build a docker image.

• This file doesn’t have any extension.

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• A lightweight, standalone and executablepackage of software.

• Includes everything which is needed to runan application like code, runtime, systemtools, system libraries and settings.

• An image is stack of multiple read onlylayers referencing another images.

• Created by docker build command.

• Stored in Docker registry (eg. Docker Hub).

Docker Image

Image = Layered File System

Base Image (Ubuntu)

.NET Core SDK

…

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• Container is an running instance of a docker image

• An isolated and secured shipping container

• Run by docker run command

Docker Container

Operating System

Software

Application Code

docker run

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• A Service to host Docker images

• Multiple options are available:• Docker Hub - (Free for public images and Paid for private images)

• Docker Trusted Registry - (on-prem or on-cloud)

Docker Registry

Docker Registry

docker push

docker pull

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Docker Container Life Cycle

Run

Dockerfile

Build

Docker Registry

PullPush

StopStartRestart

Docker Local Instance

Commit

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• A runtime to build and run container based applications whichcan run anywhere consistently on any infrastructure.

• Runs on various Linux (CentOS, Debian, Fedora, Oracle Linux,RHEL, SUSE, and Ubuntu) and Windows Server OS.

• Provides built in orchestration, container networking, out of thebox security, volume and plugins.

Docker Engine

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Server Daemon

Docker Engine Architecture

Volumes

Images

Networks

Plugins

R

E

S

T

A

P

I

Docker CLI

Docker Engine

Containers