docker.com

docker.com/tryit

registry.hub.docker.com

Virtual Machine(VM) = Virtual OS

Container = Virtual Applicaton

Run Any App, Anywhere

Virtual Machine vs Container

Virtual Machine vs Container

Containers Share the Kernel, bins/libs

Dev  ♥  Ops

Contract = Docker Container = Deploy Anywhere

Pull an Image

• docker  # Show docker commands
• docker search ubuntu  # Find an image on registry
• docker pull ubuntu  # Pull an image from registry
• docker images    # List local images

Run a Container

• docker run ubuntu echo "hello" # Execute and exit
• docker run -it ubuntu  # Open interactive terminal
  • exit
• docker run ubuntu ping google.com  # Foreground
  • ctrl - c
• docker run -d ubuntu ping google.com  #Background
• docker ps  # List containers running in background
• docker logs <id>  # Print logs for background container
• docker stop <id>   # Stop background container

Commit Image and Push

• docker run -it ubuntu  # Open interactive terminal
  • sudo apt-get update
  • sudo apt-get install nodejs  # Install node
  • exit 
• docker ps -l  # Show latest created container
• docker commit <id> <name>    # Create a new image
• docker images  # List local images
• docker push <name>    # Push to the docker hub registry

Dockerfile

# nodejs example

FROM ubuntu   

MAINTAINER Michael Jackson, majgis@gmail.com

RUN apt-get install -y python-software-properties python

RUN add-apt-repository ppa:chris-lea/node.js

RUN echo "deb http://us.archive.ubuntu.com/ubuntu/ precise universe" >> /etc/apt/sources.list

RUN apt-get update

RUN apt-get install -y nodejs

RUN mkdir /var/www

ADD app.js /var/www/app.js

EXPOSE 1234

CMD ["/usr/bin/node", "/var/www/app.js"]

app.js

// Load the http module to create an http server.

var http = require('http');

// Configure our HTTP server to respond with Hello World to all requests.

var server = http.createServer(function (request, response) {

    response.writeHead(200, {"Content-Type": "text/plain"});

    response.end("Hello FED!\n");

});

// Listen on port 1234

var port = 1234

server.listen(port);

// Put a friendly message on the terminal

console.log("Server running on port " + port);

Build Dockerfile and Run

docker build -t <name> .

 

docker run -p 4321:1234 -d <name>

Open Source Paas

https://www.openshift.com