Docker With Node

Install Docker

We can use docker CLI by install Boot2Docker or GUI via Kitematic

Install 

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boot2docker init

This creates a new virtual machine. You only need to run this command once.

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boot2docker start

Then u will see at the first time

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To connect the Docker client to the Docker daemon, please set:
    export DOCKER_HOST=tcp://192.168.59.103:2376
    export DOCKER_CERT_PATH=/Users/xxx/.boot2docker/certs/boot2docker-vm
    export DOCKER_TLS_VERIFY=1

Do it then run boot2docker start again. this time we get

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Waiting for VM and Docker daemon to start...
.o
Started.
...
Your environment variables are already set correctly.

Now we get docker in our cli, next time we will just run boot2docker start to get it. (Or just run the boot2docker Application)

Install

click Docker CLI at bottom left and run the cli

Get Node Image

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docker pull node

Run Node

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mkdir docker-node-test
cd docker-node-test
touch index.js
touch Dockerfile
npm init

Edit index.js

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console.log('Hello World');

Edit Dockerfile

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FROM node:onbuild

The ‘onbuild’ version is based on the plain ‘iojs’ version used above, but it copies your node application to the container and then runs its. Creating a derivative of this image can be as simple as referencing it and specifying the port you want to expose.

Build and Push

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docker login

This will run only once if we did not login

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docker build -t csbun/docker-node-test .
...
docker push csbun/docker-node-test
...

Then u can see ur repo on Docker Hub and Kitematic

Run a Web App

Edit Project

In this example we use Koa as a server:

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npm i koa —save

Update index.js

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'use strict';

var app = require('koa')();
app.use(function * (next) {
  this.body = 'Hello World';
});

var port = process.env.PORT || 3000;
app.listen(port, function() {
  console.log('Koa server listening on port ' + port);
});

Update Dockerfile

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FROM node:onbuild
expose 3000

Here are something about expose

Build and Run

This time, we build it in our local VM. First we need to get the IP of the virtual host:

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boot2docker ip

The VM’s Host only interface IP address is: 192.168.59.103. Then build and run:

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docker build -t docker-node-test .
...
docker run --rm  -p 40100:3000 docker-node-test

Now test it on http://192.168.59.103:40100/.

If we use Kitematic, the ip of it is different from what we get from boot2docker.

Stop Container

See what’s running in docker

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docker ps

Then we can something like this:

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CONTAINER ID        IMAGE                           ...
678e64c1fe45        docker-node-test:latest   ...

To stop this image, run

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docker stop 678e64c1fe45

References