Add docker example

Author: brikis98

README.md

@@ -3,10 +3,12 @@
 This repo contains materials for learning how to use infrastructure-as-code practices, including:
 
 1. An [example Ruby on Rails app](/example-rails-app) used for demonstration purposes.
-2. A [Packer example](/packer-example) that shows how to create an AMI that has Ruby on Rails installed and contains
+1. A [Packer example](/packer-example) that shows how to create an AMI that has Ruby on Rails installed and contains
    the code from the example Rails app.
-3. A [basic Terraform example](/terraform-example-basic) that shows an intro to Terraform.
-4. A [full Terraform example](/terraform-example-full) that shows more advanced Terraform usage, including how to take
+1. A [Docker example](/docker-example) that shows how to create a Docker container that has Node.js installed and
+   runs a simple Node "Hello, World" web server.
+1. A [basic Terraform example](/terraform-example-basic) that shows an intro to Terraform.
+1. A [full Terraform example](/terraform-example-full) that shows more advanced Terraform usage, including how to take
    the AMI created by the Packer example, deploy it on AWS, and run the example Rails app.
 
 Note: all the code in this repo is used only for demonstration and teaching purposes and should not be used in

docker-example/Dockerfile

@@ -0,0 +1,10 @@
+FROM ubuntu:latest
+MAINTAINER Yevgeniy Brikman <[email protected]>
+
+RUN apt-get update && apt-get install -y nodejs
+
+RUN mkdir -p /usr/src/app
+COPY ./src /usr/src/app
+WORKDIR /usr/src/app
+
+CMD ["nodejs", "server.js"]

docker-example/src/server.js

@@ -0,0 +1,14 @@
+var http = require('http');
+
+var server = http.createServer(function (request, response) {
+  response.writeHead(200, {"Content-Type": "text/plain"});
+  response.end("Hello World!\n");
+});
+
+server.listen(8080);
+
+console.log("Server running at http://127.0.0.1:8080/");
+
+process.on('SIGINT', function() {
+  process.exit();
+});