deploy.rb

# config/deploy.rb 
require "bundler/capistrano"

set :scm,             :git
set :repository,      "git@github.com:itsNikolay/demoapp.git"
set :branch,          "origin/master"
set :migrate_target,  :current
set :ssh_options,     { :forward_agent => true }
set :rails_env,       "production"
set :deploy_to,       "/vagrant/demoapp"
set :normalize_asset_timestamps, false

set :user,            "vagrant"
set :use_sudo,        true
set :password, "vagrant"

role :web,    "33.33.33.10"
role :app,    "33.33.33.10"
role :db,     "33.33.33.10", :primary => true

set(:latest_release)  { fetch(:current_path) }
set(:release_path)    { fetch(:current_path) }
set(:current_release) { fetch(:current_path) }

set(:current_revision)  { capture("cd #{current_path}; git rev-parse --short HEAD").strip }
set(:latest_revision)   { capture("cd #{current_path}; git rev-parse --short HEAD").strip }
set(:previous_revision) { capture("cd #{current_path}; git rev-parse --short HEAD@{1}").strip }

default_environment["RAILS_ENV"] = 'production'

# Use our ruby-1.9.2-p290@my_site gemset
#default_environment["PATH"]         = "--"
#default_environment["GEM_HOME"]     = "--"
#default_environment["GEM_PATH"]     = "--"
#default_environment["RUBY_VERSION"] = "ruby-1.9.2-p290"

default_run_options[:shell] = 'bash'

namespace :deploy do
  desc "Deploy your application"
  task :default do
    update
    restart
  end

  desc "Setup your git-based deployment app"
  task :setup, :except => { :no_release => true } do
    dirs = [deploy_to, shared_path]
    dirs += shared_children.map { |d| File.join(shared_path, d) }
    run "#{try_sudo} mkdir -p #{dirs.join(' ')} && #{try_sudo} chmod g+w #{dirs.join(' ')}"
    run "git clone #{repository} #{current_path}"
  end

  task :cold do
    update
    migrate
  end

  task :update do
    transaction do
      update_code
    end
  end

  desc "Update the deployed code."
  task :update_code, :except => { :no_release => true } do
    run "cd #{current_path}; git fetch origin; git reset --hard #{branch}"
    finalize_update
  end

  desc "Update the database (overwritten to avoid symlink)"
  task :migrations do
    transaction do
      update_code
    end
    migrate
    restart
  end

  task :finalize_update, :except => { :no_release => true } do
    run "chmod -R g+w #{latest_release}" if fetch(:group_writable, true)

    # mkdir -p is making sure that the directories are there for some SCM's that don't
    # save empty folders
    run <<-CMD
      rm -rf #{latest_release}/log #{latest_release}/public/system #{latest_release}/tmp/pids &&
      mkdir -p #{latest_release}/public &&
      mkdir -p #{latest_release}/tmp &&
      ln -s #{shared_path}/log #{latest_release}/log &&
      ln -s #{shared_path}/system #{latest_release}/public/system &&
      ln -s #{shared_path}/pids #{latest_release}/tmp/pids &&
      ln -sf #{shared_path}/database.yml #{latest_release}/config/database.yml
    CMD

    if fetch(:normalize_asset_timestamps, true)
      stamp = Time.now.utc.strftime("%Y%m%d%H%M.%S")
      asset_paths = fetch(:public_children, %w(images stylesheets javascripts)).map { |p| "#{latest_release}/public/#{p}" }.join(" ")
      run "find #{asset_paths} -exec touch -t #{stamp} {} ';'; true", :env => { "TZ" => "UTC" }
    end
  end

  desc "Zero-downtime restart of Unicorn"
  task :restart, :except => { :no_release => true } do
    run "kill -s USR2 `cat /tmp/unicorn.todo.pid`"
  end

  desc "Start unicorn"
  task :start, :except => { :no_release => true } do
    run "cd #{current_path} ; bundle exec unicorn_rails -c config/unicorn.rb -D"
  end

  desc "Stop unicorn"
  task :stop, :except => { :no_release => true } do
    run "kill -s QUIT `cat /tmp/unicorn.todo.pid`"
  end  

  namespace :rollback do
    desc "Moves the repo back to the previous version of HEAD"
    task :repo, :except => { :no_release => true } do
      set :branch, "HEAD@{1}"
      deploy.default
    end

    desc "Rewrite reflog so HEAD@{1} will continue to point to at the next previous release."
    task :cleanup, :except => { :no_release => true } do
      run "cd #{current_path}; git reflog delete --rewrite HEAD@{1}; git reflog delete --rewrite HEAD@{1}"
    end

    desc "Rolls back to the previously deployed version."
    task :default do
      rollback.repo
      rollback.cleanup
    end
  end
end

def run_rake(cmd)
  run "cd #{current_path}; #{rake} #{cmd}"
end

error

itsnikolay@itsnikolay-VirtualBox:~/vagrant/1vagrant/projects/demoapp$ cap deploy  * executing `deploy'
  * executing `deploy:update'
 ** transaction: start
  * executing `deploy:update_code'
  * executing "cd /vagrant/demoapp/current; git fetch origin; git reset --hard origin/master"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
 ** [out :: 33.33.33.10] HEAD is now at 5347b5a first commit
    command finished in 5800ms
  * executing `deploy:finalize_update'
  * executing "chmod -R g+w /vagrant/demoapp/current"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
    command finished in 738ms
  * executing "rm -rf /vagrant/demoapp/current/log /vagrant/demoapp/current/public/system /vagrant/demoapp/current/tmp/pids &&\\\n      mkdir -p /vagrant/demoapp/current/public &&\\\n      mkdir -p /vagrant/demoapp/current/tmp &&\\\n      ln -s /vagrant/demoapp/shared/log /vagrant/demoapp/current/log &&\\\n      ln -s /vagrant/demoapp/shared/system /vagrant/demoapp/current/public/system &&\\\n      ln -s /vagrant/demoapp/shared/pids /vagrant/demoapp/current/tmp/pids &&\\\n      ln -sf /vagrant/demoapp/shared/database.yml /vagrant/demoapp/current/config/database.yml"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
*** [err :: 33.33.33.10] ln:
*** [err :: 33.33.33.10] creating symbolic link `/vagrant/demoapp/current/log'
*** [err :: 33.33.33.10] : Read-only file system
*** [err :: 33.33.33.10] 
    command finished in 209ms
failed: "env RAILS_ENV=production bash -c 'rm -rf /vagrant/demoapp/current/log /vagrant/demoapp/current/public/system /vagrant/demoapp/current/tmp/pids &&\\\n      mkdir -p /vagrant/demoapp/current/public &&\\\n      mkdir -p /vagrant/demoapp/current/tmp &&\\\n      ln -s /vagrant/demoapp/shared/log /vagrant/demoapp/current/log &&\\\n      ln -s /vagrant/demoapp/shared/system /vagrant/demoapp/current/public/system &&\\\n      ln -s /vagrant/demoapp/shared/pids /vagrant/demoapp/current/tmp/pids &&\\\n      ln -sf /vagrant/demoapp/shared/database.yml /vagrant/demoapp/current/config/database.yml'" on 33.33.33.10
itsnikolay@itsnikolay-VirtualBox:~/vagrant/1vagrant/projects/demoapp$ cap deploy  * executing `deploy'
  * executing `deploy:update'
 ** transaction: start
  * executing `deploy:update_code'
  * executing "cd /vagrant/demoapp/current; git fetch origin; git reset --hard origin/master"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
 ** [out :: 33.33.33.10] HEAD is now at 5347b5a first commit
    command finished in 6339ms
  * executing `deploy:finalize_update'
  * executing "chmod -R g+w /vagrant/demoapp/current"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
    command finished in 916ms
  * executing "rm -rf /vagrant/demoapp/current/log /vagrant/demoapp/current/public/system /vagrant/demoapp/current/tmp/pids &&\\\n      mkdir -p /vagrant/demoapp/current/public &&\\\n      mkdir -p /vagrant/demoapp/current/tmp &&\\\n      ln -s /vagrant/demoapp/shared/log /vagrant/demoapp/current/log &&\\\n      ln -s /vagrant/demoapp/shared/system /vagrant/demoapp/current/public/system &&\\\n      ln -s /vagrant/demoapp/shared/pids /vagrant/demoapp/current/tmp/pids &&\\\n      ln -sf /vagrant/demoapp/shared/database.yml /vagrant/demoapp/current/config/database.yml"
    servers: ["33.33.33.10"]
    [33.33.33.10] executing command
*** [err :: 33.33.33.10] ln:
*** [err :: 33.33.33.10] creating symbolic link `/vagrant/demoapp/current/log'
*** [err :: 33.33.33.10] : Read-only file system
*** [err :: 33.33.33.10] 
    command finished in 198ms
failed: "env RAILS_ENV=production bash -c 'rm -rf /vagrant/demoapp/current/log /vagrant/demoapp/current/public/system /vagrant/demoapp/current/tmp/pids &&\\\n      mkdir -p /vagrant/demoapp/current/public &&\\\n      mkdir -p /vagrant/demoapp/current/tmp &&\\\n      ln -s /vagrant/demoapp/shared/log /vagrant/demoapp/current/log &&\\\n      ln -s /vagrant/demoapp/shared/system /vagrant/demoapp/current/public/system &&\\\n      ln -s /vagrant/demoapp/shared/pids /vagrant/demoapp/current/tmp/pids &&\\\n      ln -sf /vagrant/demoapp/shared/database.yml /vagrant/demoapp/current/config/database.yml'" on 33.33.33.10