{ Josh Rendek }

<3 Ruby & Go

Let’s start out by logging into our machine and installing some pre-requistes (these can also be found by running rvm requirements as well):

1sudo apt-get -y install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion git-core mysql-client libmysqlclient-dev libsasl2-dev libsasl2-dev mysql-server

Lets also install nodejs:

1curl -O http://nodejs.org/dist/v0.8.4/node-v0.8.4.tar.gz
2tar xzvf node-v0.8.4.tar.gz
3cd node-v0.8.4.tar.gz
4./configure && make && sudo make install

Now we can install ruby and RVM:

1curl -L https://get.rvm.io | bash -s stable --ruby
2source /home/ubuntu/.rvm/scripts/rvm
3rvm use 1.9.3 --default
4echo 'rvm_trust_rvmrcs_flag=1' > ~/.rvmrc
5# sudo su before this
6echo 'RAILS_ENV=production' >> /etc/environment
7rvm gemset create tester

And lastly nginx:

1sudo apt-get install nginx

Now let’s make a simple rails application back on our development machine with 1 simple root action:

 1rails new tester -d=mysql
 2echo 'rvm use [email protected] --create' > tester/.rvmrc
 3cd tester
 4bundle install
 5rails g controller homepage index
 6rm -rf public/index.html
 7# Open up config/routes.rb and modify the root to to point to homepage#index
 8rake db:create
 9git init .
10git remote add origin https://github.com/bluescripts/tester.git # replace this with your git repo
11git add .; git ci -a -m 'first'; git push -u origin master
12rails s

Open your browser and go to http://localhost:3000 – all good! Now lets make some modifications to our Gemfile:

 1source 'https://rubygems.org'
 2gem 'rails', '3.2.6'
 3gem 'mysql2'
 4group :assets do
 5  gem 'sass-rails',   '~> 3.2.3'
 6  gem 'coffee-rails', '~> 3.2.1'
 7  gem 'uglifier', '>= 1.0.3'
 8end
 9gem 'jquery-rails'
10gem 'capistrano', :group => :development
11gem 'unicorn'

and re-bundle:

1 bundle 

Now lets start prepping for deployment and compile our assets.

1capify .
2rake assets:precompile # dont forget to add it to git!

Make a file called config/unicorn.rb:

 1# config/unicorn.rb
 2# Set environment to development unless something else is specified
 3env = ENV["RAILS_ENV"] || "development"
 4
 5site = 'tester'
 6deploy_user = 'ubuntu'
 7
 8# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
 9# documentation.
10worker_processes 4
11
12# listen on both a Unix domain socket and a TCP port,
13# we use a shorter backlog for quicker failover when busy
14listen "/tmp/#{site}.socket", :backlog => 64
15
16# Preload our app for more speed
17preload_app true
18
19# nuke workers after 30 seconds instead of 60 seconds (the default)
20timeout 30
21
22pid "/tmp/unicorn.#{site}.pid"
23
24# Production specific settings
25if env == "production"
26  # Help ensure your application will always spawn in the symlinked
27  # "current" directory that Capistrano sets up.
28  working_directory "/home/#{deploy_user}/apps/#{site}/current"
29
30  # feel free to point this anywhere accessible on the filesystem
31  shared_path = "/home/#{deploy_user}/apps/#{site}/shared"
32
33  stderr_path "#{shared_path}/log/unicorn.stderr.log"
34  stdout_path "#{shared_path}/log/unicorn.stdout.log"
35end
36
37before_fork do |server, worker|
38  # the following is highly recomended for Rails + "preload_app true"
39  # as there's no need for the master process to hold a connection
40  if defined?(ActiveRecord::Base)
41    ActiveRecord::Base.connection.disconnect!
42  end
43
44  # Before forking, kill the master process that belongs to the .oldbin PID.
45  # This enables 0 downtime deploys.
46  old_pid = "/tmp/unicorn.#{site}.pid.oldbin"
47  if File.exists?(old_pid) && server.pid != old_pid
48    begin
49      Process.kill("QUIT", File.read(old_pid).to_i)
50    rescue Errno::ENOENT, Errno::ESRCH
51      # someone else did our job for us
52    end
53  end
54end
55
56after_fork do |server, worker|
57  # the following is *required* for Rails + "preload_app true",
58  if defined?(ActiveRecord::Base)
59    ActiveRecord::Base.establish_connection
60  end
61
62  # if preload_app is true, then you may also want to check and
63  # restart any other shared sockets/descriptors such as Memcached,
64  # and Redis.  TokyoCabinet file handles are safe to reuse
65  # between any number of forked children (assuming your kernel
66  # correctly implements pread()/pwrite() system calls)
67end
_

Now lets setup the config/deploy.rb to be more unicorn and git friendly, take note of the default environment settings which are taken from the server when running rvm info modified version of ariejan.net’s:

  1require "bundler/capistrano"
  2
  3set :scm,             :git
  4set :repository,      "[email protected]:bluescripts/tester.git"
  5set :branch,          "origin/master"
  6set :migrate_target,  :current
  7set :ssh_options,     { :forward_agent => true }
  8set :rails_env,       "production"
  9set :deploy_to,       "/home/ubuntu/apps/tester"
 10set :normalize_asset_timestamps, false
 11
 12set :user,            "ubuntu"
 13set :group,           "ubuntu"
 14set :use_sudo,        false
 15
 16role :web,    "192.168.5.113"
 17role :db,     "192.168.5.113", :primary => true
 18
 19set(:latest_release)  { fetch(:current_path) }
 20set(:release_path)    { fetch(:current_path) }
 21set(:current_release) { fetch(:current_path) }
 22
 23set(:current_revision)  { capture("cd #{current_path}; git rev-parse --short HEAD").strip }
 24set(:latest_revision)   { capture("cd #{current_path}; git rev-parse --short HEAD").strip }
 25set(:previous_revision) { capture("cd #{current_path}; git rev-parse --short [email protected]{1}").strip }
 26
 27default_environment["RAILS_ENV"] = 'production'
 28
 29default_environment["PATH"]         = "/home/ubuntu/.rvm/gems/ruby-1.9.3-p194/bin:/home/ubuntu/.rvm/gems/[email protected]/bin:/home/ubuntu/.rvm/rubies/ruby-1.9.3-p194/bin:/home/ubuntu/.rvm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
 30default_environment["GEM_HOME"]     = "/home/ubuntu/.rvm/gems/ruby-1.9.3-p194"
 31default_environment["GEM_PATH"]     = "/home/ubuntu/.rvm/gems/ruby-1.9.3-p194:/home/ubuntu/.rvm/gems/[email protected]"
 32default_environment["RUBY_VERSION"] = "ruby-1.9.3-p194"
 33
 34default_run_options[:shell] = 'bash'
 35
 36namespace :deploy do
 37  desc "Deploy your application"
 38  task :default do
 39    update
 40    restart
 41  end
 42
 43  desc "Setup your git-based deployment app"
 44  task :setup, :except => { :no_release => true } do
 45    dirs = [deploy_to, shared_path]
 46    dirs += shared_children.map { |d| File.join(shared_path, d) }
 47    run "#{try_sudo} mkdir -p #{dirs.join(' ')} && #{try_sudo} chmod g+w #{dirs.join(' ')}"
 48    run "git clone #{repository} #{current_path}"
 49  end
 50
 51  task :cold do
 52    update
 53    migrate
 54  end
 55
 56  task :update do
 57    transaction do
 58      update_code
 59    end
 60  end
 61
 62  desc "Update the deployed code."
 63  task :update_code, :except => { :no_release => true } do
 64    run "cd #{current_path}; git fetch origin; git reset --hard #{branch}"
 65    finalize_update
 66  end
 67
 68  desc "Update the database (overwritten to avoid symlink)"
 69  task :migrations do
 70    transaction do
 71      update_code
 72    end
 73    migrate
 74    restart
 75  end
 76
 77  task :finalize_update, :except => { :no_release => true } do
 78    run "chmod -R g+w #{latest_release}" if fetch(:group_writable, true)
 79
 80    # mkdir -p is making sure that the directories are there for some SCM's that don't
 81    # save empty folders
 82    run <<-CMD
 83      rm -rf #{latest_release}/log #{latest_release}/public/system #{latest_release}/tmp/pids &&
 84      mkdir -p #{latest_release}/public &&
 85      mkdir -p #{latest_release}/tmp &&
 86      ln -s #{shared_path}/log #{latest_release}/log &&
 87      ln -s #{shared_path}/system #{latest_release}/public/system &&
 88      ln -s #{shared_path}/pids #{latest_release}/tmp/pids &&
 89      ln -sf #{shared_path}/database.yml #{latest_release}/config/database.yml
 90    CMD
 91
 92    if fetch(:normalize_asset_timestamps, true)
 93      stamp = Time.now.utc.strftime("%Y%m%d%H%M.%S")
 94      asset_paths = fetch(:public_children, %w(images stylesheets javascripts)).map { |p| "#{latest_release}/public/#{p}" }.join(" ")
 95      run "find #{asset_paths} -exec touch -t #{stamp} {} ';'; true", :env => { "TZ" => "UTC" }
 96    end
 97  end
 98
 99  desc "Zero-downtime restart of Unicorn"
100  task :restart, :except => { :no_release => true } do
101    run "kill -s USR2 `cat /tmp/unicorn.tester.pid`"
102  end
103
104  desc "Start unicorn"
105  task :start, :except => { :no_release => true } do
106    run "cd #{current_path} ; bundle exec unicorn_rails -c config/unicorn.rb -D"
107  end
108
109  desc "Stop unicorn"
110  task :stop, :except => { :no_release => true } do
111    run "kill -s QUIT `cat /tmp/unicorn.tester.pid`"
112  end
113
114  namespace :rollback do
115    desc "Moves the repo back to the previous version of HEAD"
116    task :repo, :except => { :no_release => true } do
117      set :branch, "[email protected]{1}"
118      deploy.default
119    end
120
121    desc "Rewrite reflog so [email protected]{1} will continue to point to at the next previous release."
122    task :cleanup, :except => { :no_release => true } do
123      run "cd #{current_path}; git reflog delete --rewrite [email protected]{1}; git reflog delete --rewrite [email protected]{1}"
124    end
125
126    desc "Rolls back to the previously deployed version."
127    task :default do
128      rollback.repo
129      rollback.cleanup
130    end
131  end
132end
133
134def run_rake(cmd)
135  run "cd #{current_path}; #{rake} #{cmd}"
136end

Now lets try deploying (you may need to login to the server if this is the first time you’ve cloned from git to accept the SSH handshake):

1cap deploy:setup

Create your database config file in shared/database.yml:

1production:
2  adapter: mysql2
3  encoding: utf8
4  reconnect: false
5  database: tester_production
6  pool: 5
7  username: root
8  password:
_

Go into current and create the database if you haven’t already:

1rake db:create
2# cd down a level
3cd ../
4mkdir -p shared/pids

Now we can run the cold deploy:

1cap deploy:cold
2cap deploy:start

Now we can configure nginx:

Open up /etc/nginx/sites-enabled/default:

 1upstream tester {
 2	server unix:/tmp/tester.socket fail_timeout=0;
 3}
 4server {
 5	listen 80 default;
 6 	root /home/ubuntu/apps/tester/current/public;
 7	location / {
 8		proxy_pass  http://tester;
 9		proxy_redirect     off;
10
11		proxy_set_header   Host             $host;
12		proxy_set_header   X-Real-IP        $remote_addr;
13		proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
14
15		client_max_body_size       10m;
16		client_body_buffer_size    128k;
17
18		proxy_connect_timeout      90;
19		proxy_send_timeout         90;
20		proxy_read_timeout         90;
21
22		proxy_buffer_size          4k;
23		proxy_buffers              4 32k;
24		proxy_busy_buffers_size    64k;
25		proxy_temp_file_write_size 64k;
26	}
27
28	location ~ ^/(images|javascripts|stylesheets|system|assets)/  {
29		root /home/deployer/apps/my_site/current/public;
30		expires max;
31		break;
32    }
33}

Now restart nginx and visit http://192.168.5.113/ ( replace with your server hostname/IP ). You should be all set!

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