Rails-tutorial Chapter 1: rails server is not working on Cloud9

Question

https://www.railstutorial.org/book/beginning#sec-rails_server

我已经到了这一步，我使用的是cloud9环境。但是，当我按照该教程中的清单 1.7 运行服务器时，我得到了这个错误：

myname@rails-tutorial:~/workspace/hello_app $ rails server -p $PORT -b $IP
=> Booting WEBrick
=> Rails 4.2.0.beta2 application starting in development on http://0.0.0.0:8080
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2014-10-30 21:44:22] INFO  WEBrick 1.3.1
[2014-10-30 21:44:22] INFO  ruby 2.1.1 (2014-02-24) [x86_64-linux]
Exiting /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:206:in `bind': Address already in use - bind(2) for 0.0.0.0:8080 (Errno::EADDRINUSE)
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:206:in `listen'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:461:in `block in tcp_server_sockets'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:232:in `each'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:232:in `foreach'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/socket.rb:459:in `tcp_server_sockets'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/utils.rb:75:in `create_listeners'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/server.rb:132:in `listen'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/server.rb:113:in `initialize'
    from /usr/local/rvm/rubies/ruby-2.1.1/lib/ruby/2.1.0/webrick/httpserver.rb:45:in `initialize'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/rack-1.6.0.beta/lib/rack/handler/webrick.rb:32:in `new'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/rack-1.6.0.beta/lib/rack/handler/webrick.rb:32:in `run'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/rack-1.6.0.beta/lib/rack/server.rb:288:in `start'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands/server.rb:80:in `start'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands/commands_tasks.rb:80:in `block in server'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/railties-4.2.0.beta2/lib/rails/commands.rb:17:in `<top (required)>'
    from /home/ubuntu/workspace/hello_app/bin/rails:8:in `require'
    from /home/ubuntu/workspace/hello_app/bin/rails:8:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `load'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `call'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/client/command.rb:7:in `call'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/client.rb:26:in `run'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/bin/spring:48:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `load'
    from /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `<top (required)>'
    from /home/ubuntu/workspace/hello_app/bin/spring:16:in `require'
    from /home/ubuntu/workspace/hello_app/bin/spring:16:in `<top (required)>'
    from bin/rails:3:in `load'
    from bin/rails:3:in `<main>'

我尝试指定不同的端口，但这不起作用，cloud9 环境建议我只使用 $PORT 变量。

错误“地址已在使用中 - bind(2) for 0.0.0.0:8080 (Errno::EADDRINUSE)”暗示我已经有一个 Rails 服务器正在运行，但我没有。我不太确定在这里做什么，并且本教程没有建议任何解决此问题的方法。

Answer 1

我了解到您可以使用命令 killall ruby 来停止任何对我有帮助的 ruby​​ 进程，因为我在教程中错误地在 ~/workspace 级别运行了 rails server -b $IP -p $PORT 命令。我在can't open rails server找到了答案

Answer 2

我最终再次从头开始学习本教程，它运行良好，但以后遇到此问题的任何人都可能会发现我从 cloud9 的支持团队收到的这种故障排除技术很有用：

---

试试：

lsof -i:8080

这将给占用它的应用程序。

如果是 apache，使用停止它：

sudo /etc/init.d/apache2 stop

---

希望这个答案对遇到这个问题的人有用。

Answer 3

可能您只是让另一台服务器仍在运行。您之前在教程中使用rails server 命令启动的那个。您需要先使用 Ctrl+C 关闭另一个，然后再尝试rails server -b $IP -p $PORT

Answer 4

$ rails server -b $IP -p $PORT

Cloud9 使用特殊的环境变量 $IP 和 $PORT 来分配 动态的IP地址和端口号。如果你想看 这些变量的值，在命令中键入 echo $IP 或 echo $PORT 行。

如果您等待几分钟（不超过 2 分钟），您的操作系统可能会释放端口。如果不是，请在每次运行rails server 时使用超过 5,000 的随机端口号，例如

$ rails server -b $IP -p 6789

或者，因为你的 IDE 太糟糕了，你可能会考虑使用不同的 IDE。