Advanced Virtualization- Vagrant- Docker

Mr. Mohan PawarMr. Richard Joseph

What is Vagrant ?

A CLI-based tool for streamlining the use of VM environments

(creation, provisioning, usage, & decommissioning)

A "VM environment"?

Think of this as one or more VMs (based on a user-specified template) along with networking and possible in-guest software customization.

Examples.

The classic "3 tier" web/app/DB topology.

Trying out new technologies (CoreOS and etcd cluster, Open vSwitch).

Use cases for Vagrant

Sharing VM environments with other Users.

Accelerating the creation of VM environments.

Automating software provisioning inside VM environments.

Providing a CLI for creating/destroying/accessing VM environments.

What are the components ofVagrant?

1. Vagrant

☞ Written in Ruby

☞ Multi-platform (Windows, Linux, OS X)

☞ CLI (no GUI)

2. Vagrant provider

Interfaces with back-end virtualization solution.

Vagrant comes with a provider for VirtualBox.

Provider for VMware desktop products (Fusion & Workstation) available for a free.

Other providers available as open source projects.

3. Vagrant box

Template used when creating VM environments in Vagrant.

Boxes are provider-specific.

Packer is a related product that can be used to help build Vagrant boxes.

4. Vagrantfile

A text file (written with Ruby syntax) that describes the VM environment.

Vagrant Demo Time !

What is Docker?

A CLI tool for simplifying the use of Linux containers.

Docker is an open source engine that automates the deployment of any application as a lightweight, portable and self-sufficient that will run virtually anywhere.

Package your application into a standardized unit of software development.

Docker : Name

Provide a uniformed wrapper around a software package:

«Build, Ship and Run Any App, Anywhere»

Similar to shipping containers: The container is always the same, regardless of the contents and thus fits on all trucks, cranes, ships, ...

Virtual Machine vs Docker

Docker technology

libvirt: Platform Virtualization

LXC (LinuX Containers): Multiple isolated Linux systems (containers) on a single host which is replace by LibContainers

Layered File System

Run Platforms

Various Linux distributions (Ubuntu, Fedora, RHEL, Centos, openSUSE, ...)

Cloud (Amazon EC2, Google Compute Engine, Rackspacem, Azure) 2016-12:

Microsoft announces plans to integrate Docker with next release of Windows Server

Docker is the world’s leading software containerization platform.

Docker Terminology

Persisted snapshot that can be run

images: List all local images

run: Create a container from an image and execute a command in it

tag: Tag an image

pull: Download image from repository ◦

rmi: Delete a local image This will also remove intermediate images if no longer used

Images vs Container as Class vs Object

Dockerfile

Create images automatically using a build script: «Dockerfile»

Can be versioned in a version control system like Git or SVN, along with all dependencies

Docker Hub can automatically build images based on dockerfiles on Github

Hands - On Lab Time...!

Docker Use cases

Development Environment

Environments for Integration Tests

Quick evaluation of software

Microservices

Multi-Tenancy

Unified execution environment (dev test prod (local, VM, cloud, ...) e.g. BookMyShow migrated their 3 servers to docker.

Future Scope

All IT companies are migrating their servers with docker.

Micro-service architecture

Serverless computing.

Docker Vs Vagrant

Conclusion

Containerization is the fastest, most resource effective, and most secure setup we know to date and docker is drifting the IT world in more agile way to achieved easy to create architecture.

Thank You.