DigitalOcean cluster deploy

This node.js script allows you upload an application to multiple DigitalOcean droplets and then load-balance between them using nginx. This way your application can handle more requests at the same time.

Requirements

You need to have SSH keys added to your DigitalOcean accounts. You only have to change the do_token, ssh_keys, key fields to make the demo work!

Notice

This script will cause charges to your DigitalOcean account. If you spin up 100 droplets using this script, it's your fault!

Installation

npm install do-cluster-deploy

Usage

All fields are required. Load-balancing has to work using nginx, otherwise you are free to use any technology you'd like.

	var clusterDeploy = require('do-cluster-deploy');
	var fs = require('fs');

	clusterDeploy.deploy({
		// Your droplets will be named test-1, test-2 and so on.
		prefix: 'test',
		// If you use a region with private networking, it will be faster
		region: 'fra1',
		// Digital Ocean API token, obtain from your settings
		do_token: '9801xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
		// $5 instances are just fine for this demo
		size: '512mb',
		// If you enable this, you will benefit from faster speed. Not all regions might support this.
		private_networking: true,
		// SSH keys so you don't need a password. You need to enter those into your DO account first.
		ssh_keys: ['3b:03:7d:abxxxxxxxxxxxxxxxxxxx'],
		// Any OS goes!
		image: 'ubuntu-14-04-x64',
		// test-1 and test-2 droplets will be created *if they don't exist yet*
		instances: 2,
		// Setup commands
		commands: [
			// Install git if it doesn't exist yet
			'hash git || sudo apt-get install git --yes',
			// Install node.js if it doesn't exist
			'hash nodejs || curl -sL https://deb.nodesource.com/setup | sudo bash -',
			'hash nodejs || sudo apt-get install nodejs --yes',
			// Overwrite old app version
			'rm -rf node-hello-world',
			'git clone git://github.com/JonnyBurger/node-hello-world.git',
			// Start aoo
			'npm install forever -g',
			'killall node && killall nodejs',
			'forever start node-hello-world/index.js'
		],
		master_before: [
			// Install nginx
			// Will only be executed on test-1
			'hash nginx || sudo apt-get install nginx --yes'
		],
		master_after: [
			// Restart nginx
			// Will only be executed on test-1
			'sudo service nginx restart'
		],
		nginx: [
			// Nginx configuration
			// The cluster block gets configured automatically for you
			'server {',
			'    listen 80;',
			'    location / {',
			'        proxy_pass http://cluster;',
			'    }',
			'}'
		].join('\n'),
		// Which port does your app start on before you put nginx in front of it?
		port: 5000,
		// SSH key file that matches the ssh_keys above, so no password is needed
		key: fs.readFileSync('/Users/jonnyburger/.ssh/id_rsa')
	})