“捆绑器：找不到命令：瘦”heroku 部署轨道

Question

所以我的应用程序在我的本地机器上完美运行，我成功地将它推送到 github 和 heroku，但是当我尝试在浏览器中打开应用程序时，我收到以下错误：

Application Error
An error occurred in the application and your page could not be served. Please try again in a few moments.

If you are the application owner, check your logs for details.

然后我尝试运行

$ heroku logs

我在控制台中得到以下输出：

2012-07-05T21:52:11+00:00 heroku[slugc]: Slug compilation started
2012-07-05T21:52:33+00:00 heroku[slugc]: Slug compilation failed: failed to compile Ruby/rails app
2012-07-05T21:53:33+00:00 heroku[slugc]: Slug compilation started
2012-07-05T21:53:55+00:00 heroku[slugc]: Slug compilation failed: failed to compile Ruby/rails app
2012-07-05T21:58:45+00:00 heroku[slugc]: Slug compilation started
2012-07-05T21:59:04+00:00 heroku[slugc]: Slug compilation failed: failed to compile Ruby/rails app
2012-07-05T22:00:34+00:00 heroku[slugc]: Slug compilation started
2012-07-05T22:01:21+00:00 heroku[api]: Add shared-database:5mb add-on by aayushgopaldawra@gmail.com
2012-07-05T22:01:21+00:00 heroku[api]: Release v2 created by username@gmail.com
2012-07-05T22:01:21+00:00 heroku[api]: Add RAILS_ENV, LANG, PATH, RACK_ENV, GEM_PATH config by aayushgopaldawra@gmail.com
2012-07-05T22:01:21+00:00 heroku[api]: Release v3 created by username@gmail.com
2012-07-05T22:01:23+00:00 heroku[api]: Release v4 created by username@gmail.com
2012-07-05T22:01:23+00:00 heroku[api]: Deploy 23effb5 by username@gmail.com
2012-07-05T22:01:24+00:00 heroku[slugc]: Slug compilation finished
2012-07-05T22:01:27+00:00 heroku[web.1]: Starting process with command `bundle exec thin start -R config.ru -e production -p 4606`
2012-07-05T22:01:30+00:00 app[web.1]: bundler: command not found: thin
2012-07-05T22:01:30+00:00 app[web.1]: Install missing gem executables with `bundle install`
2012-07-05T22:01:31+00:00 heroku[web.1]: Process exited with status 127
2012-07-05T22:01:31+00:00 heroku[web.1]: State changed from starting to crashed
2012-07-05T22:01:31+00:00 heroku[web.1]: State changed from crashed to starting
2012-07-05T22:01:34+00:00 heroku[web.1]: Starting process with command `bundle exec thin start -R config.ru -e production -p 16779`
2012-07-05T22:01:35+00:00 app[web.1]: bundler: command not found: thin
2012-07-05T22:01:35+00:00 app[web.1]: Install missing gem executables with `bundle install`
2012-07-05T22:01:36+00:00 heroku[web.1]: Process exited with status 127
2012-07-05T22:01:36+00:00 heroku[web.1]: State changed from starting to crashed
2012-07-05T22:01:37+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:38+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:49+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:49+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:50+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:51+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:51+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-07-05T22:01:51+00:00 heroku[router]: Error H10 (App crashed) -> GET glowing-robot-9319.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=

我不知道该怎么做，因为这是我第一次部署到 Heroku，而且我对网络部署一无所知。任何帮助将不胜感激！

Answer 1

对我来说，问题是我在开发部分向我的 Gemfile 添加了 thin，但是一旦我这样做了，heroku 就想将它用于生产，但没有在开发部分安装 gem。通过将瘦 gem 移出开发部分以供所有环境使用，我能够克服这个错误。

对于 Rails 应用程序，您的 Gemfile 可能看起来像这样：

source 'https://rubygems.org'

gem 'rails'
gem 'heroku'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'pg'
gem 'thin'

# more gems

无论如何，Heroku recommends thin 用于生产 Web 服务器。

更新 (2012-05-16)：在 Heroku 上方的 Rails 3 网络服务器链接中，现在 recommends unicorn。 thin 仍然可以，但您可能需要考虑switching over to unicorn。

Answer 2

您的 Gemfile 中可能缺少一个 gem。确保您的应用程序所需的一切都在 Gemfile 中指定，而不是在本地执行“gem install”。要验证，您可以安装RVM，专门为您的应用创建一个 gemset，在您的应用目录中运行“bundle install”，然后查看您的应用是否在本地运行。如果它不运行，则肯定缺少 gem。

Answer 3

似乎 heroku 正在尝试在没有 Procfile 的情况下启动 Thin 来告诉它。如上所述，Gemfile 中未安装 Thin，因此出现错误。如上所述，将 Thin 从开发组中移除是可行的。

如果您想让 heroku 启动 Unicorn 而不是 Thin，请设置您的 config/unicorn.rb 和 Procfile，如下所示：https://devcenter.heroku.com/articles/rails-unicorn

Unicorn 的 Procfile 内容在上面的链接中列出，有关 Procfile（只是应用程序根目录中名为“Procfile”的文件）的更多信息：https://devcenter.heroku.com/articles/procfile