Docker Cookbook

10.1 CI/CD: Setting Up a Development Environment
Contributed by Pini Reznik
Problem
You need a consistent and reproducible development environment for your Node.js
application. You don’t want to rebuild the Docker image every time you make small
changes to the Node.js sources.
Solution
Create a Docker image that includes all the required dependencies. Mount external
volumes during the development and use the ADD instruction in the Dockerfile for
distributing the image with the application to other developers.
First you need a Node.js Hello World application that includes two files:
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 World"
);
});
// Listen on port 8000, IP defaults to "0.0.0.0"
server
.
listen
(
8000
);
// Put a friendly message on the terminal
console
.
log
(
"Server running at http://127.0.0.1:8000/"
);
300 | Chapter 10: Application Use Cases

---

package.json
:
{
"name"
:
"hello-world"
,
"description"
:
"hello world"
,
"version"
:
"0.0.1"
,
"private"
: