Rails+Capistrano：部署新代码时，Sidekiq 并不总是启动答案

【问题标题】：Rails+Capistrano: Sidekiq doesn't always start when new code is deployedRails+Capistrano：部署新代码时，Sidekiq 并不总是启动
【发布时间】：2016-08-19 02:25:36
【问题描述】：

在使用 Capistrano 部署新代码时，我有时会遇到 Sidekiq 问题。

这是我的设置 (deploy/production.rb)：

set :rails_env, "production"
set :stage, :production

set :whenever_command, "bundle exec whenever"
set :whenever_environment, defer { stage }
require "whenever/capistrano"

set :user, 'deployer'
set :use_sudo, false

before "deploy", "deploy:setup"
after "deploy:restart", "deploy:cleanup"

server "IP", :web, :app, :db, primary: true
set :deploy_to, "/home/deployer/apps/myapp-production/"

set :ssh_options, { :forward_agent => true }
set :keep_releases, 3

namespace :deploy do
  %w[start stop restart].each do |command|
    desc "#{command} unicorn server"
    task command, roles: :app, except: {no_release: true} do
      run "/etc/init.d/unicorn_myapp-production #{command}"
    end
  end
  task :setup_config, roles: [:app] do
    sudo "ln -nfs #{current_path}/config/nginx_production.conf /etc/nginx/sites-enabled/default"
    sudo "ln -nfs #{current_path}/config/unicorn_init_production.sh /etc/init.d/unicorn_myapp-production"
    run "mkdir -p #{shared_path}/config"
    put File.read("config/database.yml"), "#{shared_path}/config/database.yml"
    puts "Now edit the config files in #{shared_path}."
  end
  after "deploy:setup", "deploy:setup_config"

  task :symlink_config, roles: [:app] do
    run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
  end
  after "deploy:finalize_update", "deploy:symlink_config"
  after "deploy:create_symlink", "deploy:restart"

  desc "Make sure local git is in sync with remote."
  task :check_revision, roles: [:web] 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

  namespace :assets do
    task :precompile, :roles => :web, :except => { :no_release => true } do
      begin
        from = source.next_revision(current_revision) # <-- Fail here at first-time deploy because of current/REVISION absence
      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

  before "deploy", "deploy:check_revision"
end

有时会发生的情况是我部署了一些代码，一次 Sidekiq 正在运行，另一次却没有。我想说这个比例是 1/5 的情况下 Sidekiq 在部署新代码后没有运行（没有重新启动）。

如何确保 Sidekiq 在每次部署后始终运行（正确重启）？

谢谢

编辑：

deploy.rb:

require "capistrano/ext/multistage"
require "rvm/capistrano"
require 'bundler/capistrano'
require 'delayed/recipes' # added for running deplayed jobs
require 'capistrano/sidekiq'

set :application, 'myapp'
set :bundle_flags, "--quiet --no-cache"

# Default value for :scm is :git
set :scm, :git
default_run_options[:pty] = true
set :deploy_via, :remote_cache
set :repository, 'git@bitbucket.org:username/myapp.git'
set :branch, "master"

set :normalize_asset_timestamps, false

set :pty, true

EDIT2： 另外，我不确定这是否相关，但有时当我更改/config 文件夹中的某些内容时，我需要登录（Ubuntu）服务器，杀死独角兽进程并手动启动服务器以查看更改。

【问题讨论】：

我在 capistrano 配置中没有看到 sidekiq 部署代码。你如何部署你的 sidekiq？
抱歉，忘记添加这部分了。我添加了deploy.rb 部分。
@user984621 你在 sidekiq 日志中有任何错误吗？
@Sebin 没有错误，只是没有运行；如果我发送一个使用 Sidekiq 的请求，那么这个请求会存储在 Redis 中，一旦 Sidekiq 运行，这个请求就会从 Redis 中提取并处理。

标签： ruby-on-rails ubuntu amazon-ec2 capistrano sidekiq

【解决方案1】：

这是 Capistrano 3 的一个已知问题，将 pty 设置为 false 应该可以解决问题。

存在一个已知错误，当 Capistrano 3 上 pty 为 true 时，会阻止 sidekiq 启动。

设置：pty，假

https://github.com/seuros/capistrano-sidekiq#known-issues-with-capistrano-3

【讨论】：