Docker Introduction 

Who am I • Niket Patel • @nexneo on Twitter, Github • Working at Beehively as Chief Technologist • Docker newbie 

How did we get here? 

Virtual Machines Image Credit: Wikipedia(User: Scsami) 

Virtualization Pros/Cons • Strong isolation between Virtual Machines • Allows for running heterogeneous OS • Overhead of running full OS • Need to maintain Hypervisor + Host OS 

Containers Linux LXC - 2008 Solaris Containers (Zones) - 2004 FreeBSD jails - 2000 chroot - 1982 

VM vs Container 

What is Docker? • Build • Ship • Run Docker is an open platform for building, shipping and running distributed applications. 

Common Terms • Docker Image - A Docker image is a read-only template. Images are used to create Docker containers. • Docker registries - Docker registries hold images. • Docker Container - A Docker container holds everything that is needed for an application to run. Each container is created from a Docker image. 

Again, What is Docker? Docker allows you to package an application with all of its dependencies into a standardized unit for software development. 

Imperfect Analogy By https://labs.ctl.io/ The Box How the Shipping Container Made the World Smaller and the World Economy Bigger Arguably Docker is doing same thing to software world 

Demo 

Why use Docker? • Lightweight way to bundle app with all dependencies in single container. • Container is static bundle that can run anywhere (needs linux +docker engine) • You can limit container’s resources • Manage containers with docker tools (many third party tools available) • Industry wide support. Google Kubernetes, AWS Container service, AWS Beanstalk, Google container engine • Almost non-existent overhead 

Why not Docker? • Can be complex to grasp • Weaker isolation compared to Virtual Machines • Applications must run on Linux 

What next? 

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Thank you • Ishi systems for hosting • The Ahmedabad Java Meetup Group • Docker Ahmedabad Group