使用Capistrano部署Rails應用程序的文件備份

Question

我將帶有capistrano的rails 4應用程序部署到Ubuntu 14.04服務器上。 這是我當前正在使用的deploy.rb ：

server 'ip', port: port, roles: [:web, :app, :db], primary: true

set :repo_url,        'git git'
set :application,     'appname'
set :user,            'user'
set :puma_threads,    [4, 16]
set :puma_workers,    0

set :pty,             true
set :use_sudo,        false
set :stage,           :production
set :deploy_via,      :remote_cache
set :deploy_to,       "/home/#{fetch(:user)}/apps/#{fetch(:application)}"
set :puma_bind,       "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock"
set :puma_state,      "#{shared_path}/tmp/pids/puma.state"
set :puma_pid,        "#{shared_path}/tmp/pids/puma.pid"
set :puma_access_log, "#{release_path}/log/puma.error.log"
set :puma_error_log,  "#{release_path}/log/puma.access.log"
set :ssh_options,     { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa.pub) }
set :puma_preload_app, true
set :puma_worker_timeout, nil
set :puma_init_active_record, true  # Change to false when not using ActiveRecord

## Defaults:
# set :scm,           :git
# set :branch,        :master
# set :format,        :pretty
# set :log_level,     :debug
# set :keep_releases, 5

## Linked Files & Directories (Default None):
set :linked_dirs,  %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/uploads}

namespace :puma do
  desc 'Create Directories for Puma Pids and Socket'
  task :make_dirs do
    on roles(:app) do
      execute "mkdir #{shared_path}/tmp/sockets -p"
      execute "mkdir #{shared_path}/tmp/pids -p"
    end
  end

  before :start, :make_dirs
end

namespace :deploy do
  desc "Make sure local git is in sync with remote."
  task :check_revision do
    on roles(:app) do
      unless `git rev-parse HEAD` == `git rev-parse origin/master`
        puts "WARNING: HEAD is not the same as origin/master"
        puts "Run `git push` to sync changes."
        exit
      end
    end
  end

  desc 'Initial Deploy'
  task :initial do
    on roles(:app) do
      before 'deploy:restart', 'puma:start'
      invoke 'deploy'
    end
  end

  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      invoke 'puma:restart'
    end
  end

  before :starting,     :check_revision
  after  :finishing,    :compile_assets
  after  :finishing,    :cleanup
  after  :finishing,    :restart
end


namespace :sake do
  desc "Run a task on a remote server."
  # run like: cap staging sake:invoke task="a_certain_task"
  task :invoke do
    on roles(:all) do |h|
      execute "cd #{fetch(:deploy_to)}/current && bundle exec rake #{ENV['task']} RAILS_ENV=#{fetch(:rails_env)}"
    end
  end
end

# ps aux | grep puma    # Get puma pid
# kill -s SIGUSR2 pid   # Restart puma
# kill -s SIGTERM pid   # Stop puma

我在此文件中遇到問題，因此shared/public公用文件夾被覆蓋，丟失了很多上傳的圖像。 由於這種損失，我現在正在考慮采用某種方法在服務器上的應用程序目錄之外為上載的文件創建備份。

是否可以創建某種自動例程，以在capistrano部署新版本之前將當前共享文件夾復制到服務器上的節省空間？

問候。

Answer 1

是的，您可能希望掛接到Capistrano的deploy:started步驟，以便在部署新版本之前執行備份。

定義執行備份的任務：

task :backup_shared_public do
  on roles(:all) do
    # Very basic backup technique. YMMV!
    execute "mkdir -p ~/public_backups" 
    execute "cp -Rp #{shared_path.join('public')} ~/public_backups/#{Time.now.to_i}"
  end
end

然后告訴Capistrano在每次部署之前執行它：

after "deploy:started", "backup_shared_public"