Cap recipe for wordpress using nginx, php-fpm and W3 Total Cache

deploy.rb

default_run_options[:pty] = true
set :application, "<your-application-folder-name>"
set :domain, "<your-ip-addr>"
set :user, "<your-deploy-user>"
set :group, "<your-deploy-group>"
set :runner, "<your-deploy-user>"
set :use_sudo, true
set :scm, :git
set :deploy_via, :remote_cache
set :repository,  "git@github.com:your-account/your-repo.git"
set :deploy_to, "/var/www/#{application}"
set :shared_children, %w(.htaccess uploads sitemap cache w3tc)

after :deploy, "deploy:cleanup"

role :app, domain
role :web, domain
role :db,  domain, :primary => true

namespace :deploy do
  [:start, :stop, :restart].each do |t|
    desc "Restart nginx"
    task t, :roles => :app do
      ['nginx', 'php5-fpm'].each {|svc| sudo "service #{svc} #{t.to_s}" unless t == :finalize_update }
    end
  end

  desc "Setup deploy"
  task :setup, :roles => :app do
    run "mkdir -p #{deploy_to} #{deploy_to}/releases #{deploy_to}/shared && chmod g+w #{deploy_to} #{deploy_to}/releases #{deploy_to}/shared"
    run "mkdir -p #{deploy_to}/shared/uploads #{deploy_to}/shared/sitemap #{deploy_to}/shared/cache"
    run "touch #{deploy_to}/shared/htaccess.txt #{deploy_to}/shared/advanced-cache.php"
    sudo "chown -R #{user}:#{group} #{deploy_to}/shared"
  end

  desc "Symlink everythang"
  task :finalize_update, :except => { :no_release => true } do
    # set permissions on basic folders
    sudo "chown -R #{user}:#{group} #{latest_release}"
    sudo "chmod -R g-w #{latest_release}"
    sudo "chown -R #{user}:#{group} #{shared_path}"
    sudo "chmod -R g-w #{shared_path}"

    # cache folder for wp-super-cache
    sudo "chown -R www-data:www-data #{shared_path}/cache"
    sudo "chmod -R g+w #{shared_path}/cache"
    run "ln -nfs #{shared_path}/cache #{release_path}/public/wp-content/cache"

    # uploads dir
    sudo "chown -R www-data:www-data #{shared_path}/uploads"
    sudo "chmod -R g+w #{shared_path}/uploads"
    run "ln -nfs #{shared_path}/uploads #{release_path}/public/wp-content/uploads"

    # xml sitemap
    sudo "chown -R www-data:www-data #{shared_path}/sitemap"
    sudo "chmod -R g+w #{shared_path}/sitemap"
    run "ln -nfs #{shared_path}/sitemap/sitemap.xml #{release_path}/public/sitemap.xml"
    run "ln -nfs #{shared_path}/sitemap/sitemap.xml.gz #{release_path}/public/sitemap.xml.gz"

    # advanced cache drop-in
    sudo "chown -R www-data:www-data #{shared_path}/w3tc/advanced-cache.php"
    sudo "chmod -R g+w #{shared_path}/w3tc/advanced-cache.php"
    run "ln -nfs #{shared_path}/w3tc/advanced-cache.php #{release_path}/public/wp-content/advanced-cache.php"

    # the rest of the w3tc files in wp-content
    sudo "chown -R www-data:www-data #{shared_path}/w3tc/w3tc"
    sudo "chown -R www-data:www-data #{shared_path}/w3tc/w3-total-cache-config.php"
    sudo "chown -R www-data:www-data #{shared_path}/w3tc/w3-total-cache-config-preview.php"
    sudo "chmod -R g+w #{shared_path}/w3tc/w3tc"
    run "ln -nfs #{shared_path}/w3tc/db.php #{release_path}/public/wp-content/db.php"
    run "ln -nfs #{shared_path}/w3tc/object-cache.php #{release_path}/public/wp-content/object-cache.php"
    run "ln -nfs #{shared_path}/w3tc/w3-total-cache-config.php #{release_path}/public/wp-content/w3-total-cache-config.php"
    run "ln -nfs #{shared_path}/w3tc/w3-total-cache-config-preview.php #{release_path}/public/wp-content/w3-total-cache-config-preview.php"
    run "ln -nfs #{shared_path}/w3tc/w3tc #{release_path}/public/wp-content/w3tc"

    # only if using apache
    # sudo "chown -R www-data:www-data #{shared_path}/htaccess.txt"
    # run "ln -nfs #{shared_path}/htaccess.txt #{release_path}/public/.htaccess"

    # only if using super cache
    # sudo "chown -R www-data:www-data #{shared_path}/wp-cache-config.php"
    # sudo "chmod -R g+w #{shared_path}/wp-cache-config.php"
    # run "ln -nfs #{shared_path}/wp-cache-config.php #{release_path}/public/wp-content/wp-cache-config.php"
  end
end

require 'erb'
require 'open-uri'
before "deploy:setup", :db
after "deploy:update_code", "db:symlink"

set :db_name, '<your-db-name>'
set :db_user, '<your-db-user>'
set :db_pass, '<your-db-pw>'
set :db_host, 'localhost'
set :db_prfx, 'wp_'

set :secret_keys, open('https://api.wordpress.org/secret-key/1.1/salt/').read

namespace :db do
  desc "Create wp-config.php in shared path"
  task :default do
    db_config = ERB.new <<-EOF
<?php
    define('DB_NAME', '#{db_name}');
    define('DB_USER', '#{db_user}');
    define('DB_PASSWORD', '#{db_pass}');
    define('DB_HOST', '#{db_host}');
    define('DB_CHARSET', 'utf8');
    define('DB_COLLATE', '');
    #{secret_keys}
    $table_prefix  = '#{db_prfx}';
    define ('WPLANG', '');
    if ( !defined('ABSPATH') )
        define('ABSPATH', dirname(__FILE__) . '/');
    require_once(ABSPATH . 'wp-settings.php');
    EOF

    run "mkdir -p #{shared_path}/config"
    put db_config.result, "#{shared_path}/config/wp-config.php"
  end

  desc "Make symlink for wp-config.php"
  task :symlink do
    run "ln -nfs #{shared_path}/config/wp-config.php #{release_path}/wp-config.php"
  end
end