ruby-on-rails - 未初始化的常量ActiveRecord(NameError)与Dokku + Nginx + unicorn

我使用Dokku+nginx+PostgreSQL在digitalocean上运行一个Rails应用程序。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。
Gemfile公司

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

我为独角兽使用了Heroku配置
程序文件

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

配置/独角兽.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

这就是原木的样子

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，而没有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

最佳答案

我在Github页面上问了这个问题，得到了一个答案
因此，将active_recordgem添加到config/unicorn.rb可以解决以下问题：

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

这就是结果
使用docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES4a43ac670998 dokku/oktob:latest "/start web" 12 minutes ago Up 12 minutes grave_yonathfbdbb516b19c postgresql/oktob:latest "/usr/bin/start_pgsq 6 days ago Up 6 days 0.0.0.0:49153->5432/tcp elegant_ardinghelli
使用htop

关于ruby-on-rails - 未初始化的常量ActiveRecord(NameError)与Dokku + Nginx + unicorn ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29869186/