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Cap Deploy rollback on Net::SSH::Authentication error

I use Nitrous as my primary development environment. The ability to work on any one of a number of projects at any time and from anywhere is simply too convenient to overlook. {As a matter of fact, I am writing this on a Nitrous box from a hospital bed!}

On a site I have been maintaining and continuously updating (on a drogo - Ruby/Rails Nitrous box), my capistrano deploy script failed one day.

One day my Capistrano deploy for the site returned [deploy:update_code] exception while rolling back: Capistrano::ConnectionError, connection failed for: ...

The error message was a bit confusing because it pointed to SSH authentication

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#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

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module Bacon

  class Context
    def expect(obj)
      Bacon::Should.new(obj)
    end
  end

end

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Symptoms

A previously working Rails app, after a successful Capistrano deploy cycle, stops responding and the server returns the http status code 504.

Troubleshooting

I was able to successfully access the Droplet by way of SSH. Looking at the logs I noticed the unicorn server was having trouble [re]starting.

tail -f /home/unicorn/log/unicorn.log

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#!/usr/bin/env ruby
# Author : Emad Elsaid (https://github.com/blazeeboy)
require 'json'
require 'open-uri'
require 'uri'
require 'net/http'

CODE_LIMIT = 10
$url = "https://eval.in/"
$languages = {

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require 'webrick'
 
Port = 3000
Directory = Dir::pwd

WEBrick::HTTPServer.new(
	Port: Port,
	DocumentRoot: Directory
).start

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#!/usr/bin/env ruby
# gem install sinatra --no-document
# gem install github-markdown --no-document

# usage: ruby markedown.rb then, in Nitrous, simply select 'Preview -> Port 3000' on the menu

require 'sinatra'
require 'github/markdown' 
# Set port for compatability with Nitrous.IO
configure :development do

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#!/usr/bin/env ruby
require 'open-uri'
require 'json'

print 'Github Username: '
username = gets.chomp

# get gists
puts 'Downloading gists list'
gists_str = open("https://api.github.com/users/#{username}/gists").read