无法启动独角兽。答案

【问题标题】：Cannot start unicorn.无法启动独角兽。
【发布时间】：2012-06-01 14:00:57
【问题描述】：

我正在尝试使用 unicorn 启动我的应用程序，但无法启动。我有一个参数错误parse_rackup_file: rackup file (config.ru) not readable (ArgumentError)

我的环境是 rbenv ruby1.9.3 和 rails 3.1.3。

怎么了？

Mac-mini:rails_app Macmini$ cap deploy:start
  * executing `deploy:start'
  * executing "cd /home/deployer/public_html/rails_app/current/; bundle exec unicorn -c /home/deployer/public_html/rails_app/current/config/unicorn.rb -E production -D"
    servers: ["211.125.67.15"]
    [211.125.67.15] executing command
*** [err :: 211.125.67.15] /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/configurator.rb:610:in `parse_rackup_file': rackup file (config.ru) not readable (ArgumentError)
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/configurator.rb:76:in `reload'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/configurator.rb:67:in `initialize'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:104:in `new'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:104:in `initialize'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/bin/unicorn:121:in `new'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.3.1/bin/unicorn:121:in `<top (required)>'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/bin/unicorn:23:in `load'
*** [err :: 211.125.67.15] from /home/deployer/public_html/rails_app/shared/bundle/ruby/1.9.1/bin/unicorn:23:in `<main>'
*** [err :: 211.125.67.15] master failed to start, check stderr log for details
    command finished in 1021ms
failed: "env RBENV_ROOT=/usr/local/rbenv PATH=/usr/local/rbenv/shims:/usr/local/rbenv/bin:$PATH sh -c 'cd /home/deployer/public_html/rails_app/current/; bundle exec unicorn -c /home/deployer/public_html/rails_app/current/config/unicorn.rb -E production -D'" on 211.125.67.15
Mac-mini:rails_app Macmini$

【问题讨论】：

不知道stderr日志在哪里...
我不知道为什么，但现在工作正常。

标签： ruby-on-rails-3 unicorn

【解决方案1】：

我通过添加解决了这个问题

working_directory("/path/to/rails_root")

在config/unicorn.rb内

您可以参考这里的文档： http://unicorn.bogomips.org/Unicorn/Configurator.html#method-i-working_directory

【讨论】：