对于Linux设置（和heroku），我是一个菜鸟，如果这个问题很简单，我们深表歉意。

我想在Heroku上运行Selenium Webkit（红宝石）。我遇到了一个困难，我的脚本无法找到Chrome二进制文件。

我实际上让chrome自行工作：

~ $ chromedriver
Starting ChromeDriver 2.22.397932 (282ed7cf89cf0053b6542e0d0f039d4123bbb6ad) on port 9515
Only local connections are allowed.

chromedriver是我从中复制的文件/app/vendor/bundle/bin/chromedriver，只是为了让它现在更容易。chromedriver该文件存在，因为我安装了chromedriver-
helper gem。这本宝石原本应该使二进制文件可用于红宝石处理，但事实并非如此。

我还尝试了显式设置路径，例如Selenium::WebDriver::Chrome.driver_path = 'chromedriver'在我的Ruby代码中，将上述文件放在根目录中。

一切都可以在本地完美运行（无论是否带有driver_path）

可能是什么原因？我从几年前就读过这个SO线程，但是对我来说似乎已经过时了。任何想法将不胜感激！

错误跟踪：

~ $ ruby bin/run.rb
/app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/response.rb:70:in `assert_ok': unknown error: cannot find Chrome binary (Selenium::WebDriver::Error::UnknownError)
  (Driver info: chromedriver=2.22.397932 (282ed7cf89cf0053b6542e0d0f039d4123bbb6ad),platform=Linux 3.13.0-91-generic x86_64)
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/response.rb:34:in `initialize'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/common.rb:78:in `new'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/common.rb:78:in `create_response'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/default.rb:90:in `request'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/common.rb:59:in `call'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:649:in `raw_execute'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:123:in `create_session'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:87:in `initialize'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/chrome/bridge.rb:48:in `initialize'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/common/driver.rb:64:in `new'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/common/driver.rb:64:in `for'
    from /app/vendor/bundle/ruby/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver.rb:84:in `for'
    from /app/lib/mealpass_orderer.rb:12:in `initialize'
    from /app/lib/mealpass_orderer.rb:8:in `new'
    from /app/lib/mealpass_orderer.rb:8:in `run'
    from bin/run.rb:3:in `<main>'

更新：

我在AWS EC2服务器上尝试了相同的方式（启动实例，克隆的gitrepo，安装了所有依赖项）。那里也发生同样的情况。也就是说，能够从终端执行chromedriver，但是在运行脚本时看到相同的错误。