Problems of developers

• Linux, Windows, Mac, ...
• LAMP, WAMP, XAMP
• Different version of libraries for different platforms/distributions
• Server stack can be much different

Deployment problems

• Cloud
• Scalability

What is docker?

Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications.

Why Docker?

• Faster delivery of your applications
• Deploy and scale more easily
• Get higher density and run more workloads
• Faster deployment makes for easier management

Docker's architecture?

Docker uses a client-server architecture.

• The Docker daemon
• The Docker client
• Components
  • Docker images
  • Docker registries (Docker Hub)
  • Docker containers

How it works?

Simple use case

Download (or create) image you want to run

							docker pull nginx
						

Run container from image

							# Run server
							docker run -p 80:80 -d nginx nginx

							## OR

							# Run server with local files
							docker run -v /path/to/local/dir:/var/www -p 80:80 -d nginx nginx
						

Build your own image

							# Pull base OS
							$ docker pull centos

							## Show available images
							$ docker images

							## Run image into interactive mode
							$ docker run -t -i centos:centos7 /bin/bash

							## notice we are in the container bash with superuser permissions
							bash-4.2$ yum update -y

							## Install applications and make config file changes as you want
							bash-4.2$ yum install php vim git nginx

							## exit the container
							bash-4.2$ exit

							# run docker ps -a to see containerID so you can commit it and save it as an image
							$ docker ps -a
							$ docker commit {{containerID}} centosnginx

						

Any App, Anywhere

Docker Engine uses Linux-specific kernel features

For Mac and Windows: Boot2Docker (VirtualBox VM)

Docker and Microsoft Partner to Drive Adoption of Distributed Applications to Every Enterprise Operating System and Cloud