这对我来说似乎很奇怪。我刚刚将我的 rails api 从 rails 3.2 升级到 rails 4.0.0.rc1。
所有测试都在本地通过，并且在本地生产模式下也可以正常运行。
但是，当我部署到 Heroku 时，日志显示应用程序无法启动。奇怪的是，在日志显示 rails server 命令后，它们会显示输出，就好像我输入了“rails new -h”一样。
她是我的小应用的 github 。这是我的heroku日志：
› heroku logs
2013-05-24T20:37:18.023853+00:00 heroku[web.1]: State changed from crashed to starting
2013-05-24T20:37:20.904692+00:00 heroku[web.1]: Starting process with command `bin/rails server -p 39526 -e production`
2013-05-24T20:37:21.886451+00:00 app[web.1]: Options:
2013-05-24T20:37:21.886451+00:00 app[web.1]: Usage:
2013-05-24T20:37:21.886451+00:00 app[web.1]: rails new APP_PATH [options]
2013-05-24T20:37:21.888820+00:00 app[web.1]: -m, [--template=TEMPLATE] # Path to some application template (can be a filesystem path or URL)
2013-05-24T20:37:21.888820+00:00 app[web.1]: # Default: /app/vendor/ruby-2.0.0/bin/ruby
2013-05-24T20:37:21.888820+00:00 app[web.1]: [--skip-gemfile] # Don't create a Gemfile
2013-05-24T20:37:21.888820+00:00 app[web.1]: -O, [--skip-active-record] # Skip Active Record files
2013-05-24T20:37:21.888820+00:00 app[web.1]: -G, [--skip-git] # Skip .gitignore file
2013-05-24T20:37:21.889145+00:00 app[web.1]: # Default: jquery
2013-05-24T20:37:21.888820+00:00 app[web.1]: -B, [--skip-bundle] # Don't run bundle install
2013-05-24T20:37:21.888820+00:00 app[web.1]: [--skip-keeps] # Skip source control .keep files
2013-05-24T20:37:21.889145+00:00 app[web.1]: -J, [--skip-javascript] # Skip JavaScript files
2013-05-24T20:37:21.888820+00:00 app[web.1]: -S, [--skip-sprockets] # Skip Sprockets files
2013-05-24T20:37:21.889145+00:00 app[web.1]: -j, [--javascript=JAVASCRIPT] # Preconfigure for selected JavaScript library
2013-05-24T20:37:21.888820+00:00 app[web.1]: -d, [--database=DATABASE] # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
2013-05-24T20:37:21.889145+00:00 app[web.1]: # Default: sqlite3
2013-05-24T20:37:21.886451+00:00 app[web.1]:
2013-05-24T20:37:21.889145+00:00 app[web.1]: [--dev] # Setup the application with Gemfile pointing to your Rails checkout
2013-05-24T20:37:21.889145+00:00 app[web.1]: [--edge] # Setup the application with Gemfile pointing to Rails repository
2013-05-24T20:37:21.889145+00:00 app[web.1]: -T, [--skip-test-unit] # Skip Test::Unit files
2013-05-24T20:37:21.889145+00:00 app[web.1]: [--rc=RC] # Path to file containing extra configuration options for rails command
2013-05-24T20:37:21.889145+00:00 app[web.1]: [--no-rc] # Skip loading of extra configuration options from .railsrc file
2013-05-24T20:37:21.889398+00:00 app[web.1]: Runtime options:
2013-05-24T20:37:21.889398+00:00 app[web.1]: -f, [--force] # Overwrite files that already exist
2013-05-24T20:37:21.889145+00:00 app[web.1]:
2013-05-24T20:37:21.889398+00:00 app[web.1]: -p, [--pretend] # Run but do not make any changes
2013-05-24T20:37:21.889398+00:00 app[web.1]: -q, [--quiet] # Suppress status output
2013-05-24T20:37:21.888820+00:00 app[web.1]: -r, [--ruby=PATH] # Path to the Ruby binary of your choice
2013-05-24T20:37:21.889398+00:00 app[web.1]: -s, [--skip] # Skip
files that already exist
2013-05-24T20:37:21.889398+00:00 app[web.1]: Rails options:
2013-05-24T20:37:21.889398+00:00 app[web.1]:
2013-05-24T20:37:21.889398+00:00 app[web.1]:
2013-05-24T20:37:21.889398+00:00 app[web.1]: -h, [--help] # Show this help message and quit
2013-05-24T20:37:21.889398+00:00 app[web.1]: -v, [--version] # Show Rails version number and quit
2013-05-24T20:37:21.889654+00:00 app[web.1]: directory structure and configuration at the path you specify.
2013-05-24T20:37:21.889654+00:00 app[web.1]:
2013-05-24T20:37:21.889654+00:00 app[web.1]: The 'rails new' command creates a new Rails application with a default
2013-05-24T20:37:21.889654+00:00 app[web.1]: Description:
2013-05-24T20:37:21.889654+00:00 app[web.1]: You can specify extra command-line arguments to be used every time
2013-05-24T20:37:21.889654+00:00 app[web.1]: 'rails new' runs in the .railsrc configuration file in your home directory.
2013-05-24T20:37:21.889654+00:00 app[web.1]: Note that the arguments specified in the .railsrc file don't affect the
2013-05-24T20:37:21.889898+00:00 app[web.1]: Example:
2013-05-24T20:37:21.889654+00:00 app[web.1]:
2013-05-24T20:37:21.889654+00:00 app[web.1]:
2013-05-24T20:37:21.889898+00:00 app[web.1]:
2013-05-24T20:37:21.889654+00:00 app[web.1]: defaults values shown above in this help message.
2013-05-24T20:37:21.889898+00:00 app[web.1]: This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
2013-05-24T20:37:21.889898+00:00 app[web.1]: See the README in the newly created application to get going.
2013-05-24T20:37:21.889898+00:00 app[web.1]: rails new ~/Code/Ruby/weblog
2013-05-24T20:37:29.907618+00:00 heroku[web.1]: Process exited with status 0
2013-05-24T20:37:29.918034+00:00 heroku[web.1]: State changed from starting to crashed