Nginx
為什麼亞馬遜 ec2 在部署後會停機,而其他相同的伺服器卻沒有?
在過去的幾個月裡,這讓我感到困惑……我承認我是伺服器管理的新手,我嘗試在 EC2 上執行一個生產 Rails 應用程序。雖然我學到了很多東西並且使用它感覺很舒服,但我不知道為什麼在部署我的程式碼後請求需要大約 1-2 分鐘才能通過。從我通過Google收集的所有資訊來看,這是乘客開始備份的事情。該解決方案似乎正在製作一個滾動重啟腳本。
我的伺服器設置是:
- Amazon EC2 Ubuntu 12.04 EBS 小實例
- Nginx
- 乘客
- PostgreSQL 9.2
- 紅寶石 1.9.3
- 導軌 3.2.11
- 使用 Capistrano 進行部署
這裡發生的所有非常基本的東西……堆棧的任何部分幾乎沒有任何自定義配置。我首先使用 Rubber 部署到 Amazon,然後從頭開始建構伺服器,因為我認為 Rubber 是部署後緩慢啟動的原因……但它仍然掛起。當然,我可以滾動重啟,添加另一個實例和負載均衡器以及第三個實例作為數據庫實例,但目前它對這個項目沒有意義。
我在其他主機(centOS 上的 rails、nginx、passenger 和 postgresql)上有一些幾乎相同的伺服器設置,它們的部署速度要快得多。它們在上限部署完成和第一個請求通過之間幾乎沒有相同的延遲。
添加我的上限部署文件
require 'rvm/capistrano' require 'bundler/capistrano' require 'sidekiq/capistrano' set :stages, %w(production staging) set :default_stage, "staging" require 'capistrano/ext/multistage' set :application, "bundio" set :repository, "git@bitbucket.org:my/project.git" set :scm, "git" set :shared_children, shared_children + %w{public/uploads} # include public/uploads in the shared folder to be symlinked across releases ssh_options[:forward_agent] = true ssh_options[:keys] = [File.join(ENV["HOME"], ".ec2", "my-keypair")] set :deploy_to, "/var/www/apps/project" set :rails_env, "production" set :rvm_type, :system set :rvm_path, "/usr/local/rvm" set :keep_releases, 3 set :deploy_via, :remote_cache desc "check production task" task :check_production do if stage.to_s == "production" puts " \n Are you REALLY sure you want to deploy to production?" puts " \n Enter the password to continue\n " password = STDIN.gets[0..12] rescue nil if password != 'doubleCheck' puts "\n !!! WRONG PASSWORD !!!" exit end end end ############# ### Hooks ### ############# before "deploy", "check_production" # if you want to clean up old releases on each deploy uncomment this: after "deploy:restart", "deploy:cleanup" after "deploy:update_code", "deploy:symlink_shared" after "deploy:update_code", "deploy:migrate" after "deploy", "deploy:restart_daemons" ################# ### End hooks ### ################# set :bundle_without, [:development,:test] namespace :deploy do namespace :assets do task :precompile, :roles => :web, :except => { :no_release => true } do begin from = source.next_revision(current_revision) rescue err_no = true end if err_no || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0 run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile} else logger.info "Skipping asset pre-compilation because there were no asset changes" end end end task :link_db do #run "ln -s #{shared_path}/config/database.yml #{latest_release}/config/database.yml" end task :start do ; end task :stop do ; end task :restart, :roles => :app, :except => { :no_release => true } do run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}" end task :restart_daemons, :roles => :app do sudo "monit restart all -g daemons" end desc "Symlink shared/* files" task :symlink_shared, :roles => :app do run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml" end end
我在部署和第一個請求到來之間經歷了同樣的滯後。如果您有少量 RAM,乘客可能需要幾分鐘才能起床。
乘客企業版保證您可以在不停機的情況下進行部署:http ://www.modrails.com/documentation/Users%20guide%20Nginx.html#PassengerRollingRestarts