New server deploy configuration

deploy.rb

# config valid only for Capistrano 3.1
lock '3.1.0'

set :application, 'samplewebsite.com'
# set :deploy_via, :copy
set :deploy_to, "/var/apps/#{fetch(:application)}"
set :checkout, "export"
# default_run_options[:pty] = true
set :use_sudo, false

set :repo_url, 'git@repository.git'

# Default branch is :master
# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }

# Default deploy_to directory is /var/www/my_app

# Default value for :scm is :git
# set :scm, :git

# Default value for :format is :pretty
# set :format, :pretty

# Default value for :log_level is :debug
# set :log_level, :debug

# Default value for :pty is false
# set :pty, true

# Default value for :linked_files is []
set :linked_files, %w{config/database.yml}

# Default value for linked_dirs is []
set :linked_dirs, fetch(:linked_dirs) + %w{public/quotes public/uploads}

# Default value for default_env is {}
# set :default_env, { path: "/opt/ruby/bin:$PATH" }

# Default value for keep_releases is 5
# set :keep_releases, 5

set :unicorn_config, "config/unicorn.rb"
set :unicorn_pid, "/tmp/unicorn.samplewebsite.com.pid"

namespace :deploy do

  desc 'Start application'
  task :start do
    on roles(:app) do
      within current_path do
        with rails_env: fetch(:rails_env) do
          execute :bundle, "exec unicorn_rails -c #{fetch(:unicorn_config)} -D"
        end
      end
      # run "cd #{current_path} && if [ ! -d tmp/pids ]; then rm -rf tmp/pids; fi"
      # run "cd #{current_path} && bundle exec unicorn_rails -c config/unicorn.rb -D -E production"
    end
  end

  desc 'Stop application'
  task :stop do
    on roles(:app) do
      if test("[ -f #{fetch(:unicorn_pid)} ]")
        execute :kill, capture(:cat, fetch(:unicorn_pid))
        # run "kill -s QUIT `cat /tmp/unicorn.samplewebsite.com.pid`"
      end
    end
  end

  desc 'Reload unicorn without stop application'
  task :reload do
    on roles(:app) do
      if test("[ -f #{fetch(:unicorn_pid)} ]")
        execute :kill, '-s USR2', capture(:cat, fetch(:unicorn_pid))
      else
        error 'Unicorn process not running'
      end
    end
  end

  desc 'Restart Unicorn'
  task :restart
  before :restart, :stop
  before :restart, :start

  after :publishing, :reload

  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      # within release_path do
      #   execute :rake, 'cache:clear'
      # end
    end
  end

end

production.rb

# config/deploy/production.rb
# Simple Role Syntax
# ==================
# Supports bulk-adding hosts to roles, the primary
# server in each group is considered to be the first
# unless any hosts have the primary property set.
# Don't declare `role :all`, it's a meta role
# role :app, %w{deploy@samplewebsite.com}
# role :web, %w{deploy@samplewebsite.com}
# role :db,  %w{deploy@samplewebsite.com}

# Extended Server Syntax
# ======================
# This can be used to drop a more detailed server
# definition into the server list. The second argument
# something that quacks like a hash can be used to set
# extended properties on the server.
server 'samplewebsite.me', user: 'deploy', roles: %w{web app}, ssh_options: {
  user: 'deploy', # overrides user setting above
  forward_agent: false,
  auth_methods: %w(password),
  password: 'YOUR_PASSWORD'
}

# you can set custom ssh options
# it's possible to pass any option but you need to keep in mind that net/ssh understand limited list of options
# you can see them in [net/ssh documentation](http://net-ssh.github.io/net-ssh/classes/Net/SSH.html#method-c-start)
# set it globally
# set :ssh_options, {
#   keys: %w(/home/deploy/.ssh/id_rsa),
#   forward_agent: false,
#   auth_methods: %w(password)
#  }

set :rails_env, "production"
 
# and/or per server
# server 'example.com',
#   user: 'user_name',
#   roles: %w{web app},
#   ssh_options: {
#     user: 'user_name', # overrides user setting above
#     keys: %w(/home/user_name/.ssh/id_rsa),
#     forward_agent: false,
#     auth_methods: %w(publickey password)
#     # password: 'please use keys'
#   }
# setting per server overrides global ssh_options

samplesite.com.conf

# /etc/nginx/sites-avaible/samplewebsite.com
upstream samplewebsite {
  server unix:/tmp/samplewebsite.com.socket fail_timeout=0;
}
 
server {
 
    # enable one of the following if you're on Linux or FreeBSD
    # listen 80 default deferred; # for Linux
    # listen 80 default accept_filter=httpready; # for FreeBSD
 
    # If you have IPv6, you'll likely want to have two separate listeners.
    # One on IPv4 only (the default), and another on IPv6 only instead
    # of a single dual-stack listener.  A dual-stack listener will make
    # for ugly IPv4 addresses in $remote_addr (e.g ":ffff:10.0.0.1"
    # instead of just "10.0.0.1") and potentially trigger bugs in
    # some software.
    # listen [::]:80 ipv6only=on; # deferred or accept_filter recommended
 
    client_max_body_size 4G;
    server_name samplewebsite.com;
 
    # ~2 seconds is often enough for most folks to parse HTML/CSS and
    # retrieve needed images/icons/frames, connections are cheap in
    # nginx so increasing this is generally safe...
    keepalive_timeout 5;
 
    # path for static files
    root /var/apps/samplewebsite.com/current/public;
 
    # Prefer to serve static files directly from nginx to avoid unnecessary
    # data copies from the application server.
    #
    # try_files directive appeared in in nginx 0.7.27 and has stabilized
    # over time.  Older versions of nginx (e.g. 0.6.x) requires
    # "if (!-f $request_filename)" which was less efficient:
    # http://bogomips.org/unicorn.git/tree/examples/nginx.conf?id=v3.3.1#n127
    try_files $uri/index.html $uri.html $uri @app;
 
    location @app {
      # an HTTP header important enough to have its own Wikipedia entry:
      #   http://en.wikipedia.org/wiki/X-Forwarded-For
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
      # enable this if you forward HTTPS traffic to unicorn,
      # this helps Rack set the proper URL scheme for doing redirects:
      # proxy_set_header X-Forwarded-Proto $scheme;
 
      # pass the Host: header from the client right along so redirects
      # can be set properly within the Rack application
      proxy_set_header Host $http_host;
 
      # we don't want nginx trying to do something clever with
      # redirects, we set the Host: header above already.
      proxy_redirect off;
 
      # set "proxy_buffering off" *only* for Rainbows! when doing
      # Comet/long-poll/streaming.  It's also safe to set if you're using
      # only serving fast clients with Unicorn + nginx, but not slow
      # clients.  You normally want nginx to buffer responses to slow
      # clients, even with Rails 3.1 streaming because otherwise a slow
      # client can become a bottleneck of Unicorn.
      #
      # The Rack application may also set "X-Accel-Buffering (yes|no)"
      # in the response headers do disable/enable buffering on a
      # per-response basis.
      # proxy_buffering off;
 
      proxy_pass http://samplewebsite;
    }
}

unicorn.rb

# config/unicorn.rb
# Set environment to development unless something else is specified
env = ENV["RAILS_ENV"].to_sym || :development

# Set base app path
base_path = {
  production:  "/var/apps/samplewebsite.com",
  development: "/var/www/samplewebsite.com"
}

# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
# documentation.
worker_processes 4

# listen on both a Unix domain socket and a TCP port,
# we use a shorter backlog for quicker failover when busy
listen "/tmp/samplewebsite.com.socket", :backlog => 64

# Load app into the master before forking workers for super-fast
# worker spawn times
preload_app true

# nuke workers after 30 seconds (60 is the default)
timeout 30

pid "/tmp/unicorn.samplewebsite.com.pid"

if env != :development
  working_directory "#{base_path[env]}/current"
  shared_path = "#{base_path[env]}/shared"

  stderr_path "#{shared_path}/log/unicorn.stderr.log"
  stdout_path "#{shared_path}/log/unicorn.stdout.log"
end

# http://www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
if GC.respond_to?(:copy_on_write_friendly=)
  GC.copy_on_write_friendly = true
end


before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!

  ##
  # When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
  # immediately start loading up a new version of itself (loaded with a new
  # version of our app). When this new Unicorn is completely loaded
  # it will begin spawning workers. The first worker spawned will check to
  # see if an .oldbin pidfile exists. If so, this means we've just booted up
  # a new Unicorn and need to tell the old one that it can now die. To do so
  # we send it a QUIT.
  #
  # Using this method we get 0 downtime deploys.

  old_pid = "/tmp/unicorn.samplewebsite.com.pid.oldbin"

  if File.exists?(old_pid) && server.pid != old_pid
    begin
      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill(sig, File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  # Unicorn master loads the app then forks off workers - because of the way
  # Unix forking works, we need to make sure we aren't using any of the parent's
  # sockets, e.g. db connection

  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  # Redis and Memcached would go here but their connections are established
  # on demand, so the master never opens a socket
end