Docker Explained | What Is A Docker Container? | Docker Simplified | Docker Tutorial | Edureka

DevOps Certification Training www.edureka.co/devops
Topics For Today’s Session
Problems Before Docker
Virtualization vs
Containerization
What is Docker?
How does Docker Work?
Hands-On
Docker Compose &
Docker Swarm
Docker Architecture
Docker Components

Problems Before Docker
Code works
fine in my
laptop
There is some
problem with
the code
Dev Prod

Scenario Using Virtual Machines

Scenario After Using Docker

Virtualisation Vs Containerization

What is Docker?

What is Docker?
•Docker is a tool designed to make it easier to create, deploy, and run
applications by using containers.
•Docker containers are lightweight alternatives to Virtual Machines, and it
uses the host OS.
•You don’t have to pre-allocate any RAM in containers.

Docker Engine is simply the
docker application that is
installed on your host
machine.
How Does Docker Work?
Docker Engine
Docker CLI
Client
REST API Docker Daemon
Server
The Client- Server
architecture communicates
using a REST API.
Docker Daemon checks the
requests to manage the
containers.
Docker Engine uses a Client Server Architecture.

Components of Docker
Dockerfile DockerImage Docker Container Docker Registry

Docker File, Images & Container
Docker File Docker Image Docker Container
Build Run
Isolated Application Platform
Contains Everything Needed To
Run The Application
Built From One Or More Images
Read Only Template Used To
Create Containers
Built By Docker Users
Stored In Docker Hub Or Your
Local Registry
A text document which contains
all the commands that a user
can call on the command line to
assemble an image.

Docker Registry
▪Control where your images are being stored
▪Integrate image storage with your in-house development workflow
▪Docker Registry is a storage component for Docker Images
▪We can store the Images in either Public / Private repositories
▪Docker Hub is Docker’s very own cloud repository
Why Use Docker Registries?

Docker Architecture

Docker Swarm
Docker Swarm provides native clustering capabilities to turn a group of Docker engines
into a single, virtual Docker Engine. With these pooled resources, you can scale out your
application as if it were running on a single, huge computer.

Docker Compose
Docker Compose makes it easier to configure and run applications made up of multiple
containers. For the example: imagine being able to define three containers—one
running a web app, another running postgres, and a third running redis—all in one
YAML file and then running those three connected containers with a single command.
You can run these three
containers with a single
command

Docker Explained | What Is A Docker Container? | Docker Simplified | Docker Tutorial | Edureka

Docker Explained | What Is A Docker Container? | Docker Simplified | Docker Tutorial | Edureka

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Docker Explained | What Is A Docker Container? | Docker Simplified | Docker Tutorial | Edureka