ruby-on-rails - 使用 Dokku + nginx + unicorn 的未初始化常量 ActiveRecord (NameError)

Question

我使用 Dokku 在 digitalocean 上运行 Rails 应用程序+ nginx + PostgreSQL。部署的应用程序正在使用 WEBrick 作为默认服务器运行，我想迁移到 unicorn。

gem 文件

group :production do
  gem 'pg'
  gem 'unicorn'
end

我用过 Heroku unicorn 的配置

程序文件

web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

config/unicorn.rb

worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 15
preload_app true

before_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
    Process.kill 'QUIT', Process.pid
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

日志是这样的

root@oktobTest:~# dokku logs oktob
I, [2015-04-25T18:30:29.195191 #13]  INFO -- : Refreshing Gem list
config.ru:4:in `block in <main>': uninitialized constant ActiveRecord (NameError)
    from /app/vendor/bundle/ruby/2.1.0/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
    from /app/vendor/bundle/ruby/2.1.0/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
    from config.ru:1:in `new'
    from config.ru:1:in `<main>'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/lib/unicorn.rb:48:in `eval'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/lib/unicorn.rb:48:in `block in builder'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/lib/unicorn/http_server.rb:764:in `call'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/lib/unicorn/http_server.rb:764:in `build_app!'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/lib/unicorn/http_server.rb:137:in `start'
    from /app/vendor/bundle/ruby/2.1.0/gems/unicorn-4.8.3/bin/unicorn:126:in `<top (required)>'
    from /app/vendor/bundle/ruby/2.1.0/bin/unicorn:23:in `load'
    from /app/vendor/bundle/ruby/2.1.0/bin/unicorn:23:in `<main>'

当我运行 docker ps 命令时，我只看到 PostgreSQL 进程，没有 Rails 服务器的进程。

root@oktobTest:~# docker ps
CONTAINER ID        IMAGE                     COMMAND                CREATED             STATUS              PORTS                     NAMES
fbdbb516b19c        postgresql/oktob:latest   "/usr/bin/start_pgsq   2 hours ago         Up 2 hours          0.0.0.0:49153->5432/tcp   elegant_ardinghelli

Answer 1

我在 dokku 上问了这个问题Github页面并得到了答案

因此将 active_record gem 添加到 config/unicorn.rb 将解决问题:

require 'rubygems'
require 'active_record'

worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 15
preload_app true

before_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
    Process.kill 'QUIT', Process.pid
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

这是结果

使用 docker ps


容器 ID 图像命令创建状态端口名称
4a43ac670998 dokku/oktob:latest "/start web"12 分钟前 上升 12 分钟 grave_yonath
fbdbb516b19c postgresql/oktob:latest "/usr/bin/start_pgsq 6 天前 Up 6 天 0.0.0.0:49153->5432/tcp elegant_ardinghelli


使用 htop