Josh joshuaob

If you're writing web applications with Ruby there comes a time when you might need something a lot simpler, or even faster, than Ruby on Rails or the Sinatra micro-framework. Enter Rack.

Rack describes itself as follows:

Rack provides a minimal interface between webservers supporting Ruby and Ruby frameworks.

Before Rack came along Ruby web frameworks all implemented their own interfaces, which made it incredibly difficult to write web servers for them, or to share code between two different frameworks. Now almost all Ruby web frameworks implement Rack, including Rails and Sinatra, meaning that these applications can now behave in a similar fashion to one another.

At it's core Rack provides a great set of tools to allow you to build the most simple web application or interface you can. Rack applications can be written in a single line of code. But we're getting ahead of ourselves a bit.

How-to setup a simple git push deployment

These are my notes basically. At first i created this gist just as a reminder for myself. But feel free to use this for your project as a starting point. If you have questions you can find me on twitter @thomasf https://twitter.com/thomasf This is how i used it on a Debian Wheezy testing (https://www.debian.org/releases/testing/)

Discuss, ask questions, etc. here https://news.ycombinator.com/item?id=7445545

On the server (example.com)

DigitalOcean Ubuntu 14.04 x64 + Rails 4 + Nginx + Unicorn + PostgreSQL + Capistrano 3

Create a Droplet

SSH into Root

$ ssh [email protected]

Change Root Password

	class Cosine
	def initialize vecA, vecB
	@vecA = vecA
	@vecB = vecB
	end

	def calculate_similarity
	return nil unless @vecA.is_a? Array
	return nil unless @vecB.is_a? Array
	return nil if @vecA.size != @vecB.size

	.video-container {
	position: relative;
	padding-bottom: 56.25%; /16:9/
	padding-top: 30px;
	height: 0;
	overflow: hidden;
	}

	.video-container iframe,
	.video-container object,

	[Unit]
	Description=Puma Rails Server
	After=network.target

	[Service]
	Type=simple
	User=deploy
	WorkingDirectory=/home/deploy/app/current
	ExecStart=/home/deploy/.rbenv/bin/rbenv exec bundle exec puma -C /home/deploy/app/shared/config/puma.rb
	ExecStop=/home/deploy/.rbenv/bin/rbenv exec bundle exec pumactl -S /home/deploy/app/shared/tmp/pids/puma.state stop

	# format and mount volume according to Digital Ocean instructions
	# I followed the instructions found by clicking the "config instructions" link on the volume
	#
	$ sudo mkfs.ext4 -F /dev/disk/by-id/scsi-0DO_Volume_volume-fra1-01
	$ sudo mkdir -p /mnt/volume-fra1-01;
	$ sudo mount -o discard,defaults /dev/disk/by-id/scsi-0DO_Volume_volume-fra1-01 /mnt/volume-fra1-01;
	$ echo /dev/disk/by-id/scsi-0DO_Volume_volume-fra1-01 /mnt/volume-fra1-01 ext4 defaults,nofail,discard 0 0 \| sudo tee -a /etc/fstab
	$ sudo reboot
	$ ls /mnt/
	#

	#!/bin/bash

	USER=deploy
	KEYS_PATH=https://github.com/chloerei.keys

	useradd -s /bin/bash -m deploy
	passwd $USER
	adduser $USER sudo
	mkdir /home/$USER/.ssh
	wget $KEYS_PATH -O /home/$USER/.ssh/authorized_keys

	daemon off;

	worker_processes 4;

	events {
	use epoll;
	accept_mutex on;
	multi_accept on;
	worker_connections 1024;
	}

	#
	# mmm m m mmm mmm mmm mmmmm mmm
	# " # "m m m" #" # # " #" "# # # # #" #
	# m"""# #m#m# #"""" """m # # # # # #""""
	# "mm"# # # "#mm" "mmm" "#m#" # # # "#mm"
	#
	# nginx configuration For Ruby/Rack web applications
	#
	# Cooked up with style, care and a bit of secret
	# nerdy spice. :-)