Question

尝试启动我的rails服务器，但是我收到了错误

=> Booting Puma
=> Rails 5.1.4 application starting in development 
=> Run `rails server -h` for more startup options
[25156] Puma starting in cluster mode...
[25156] * Version 3.9.1 (ruby 2.4.1-p111), codename: Private Caller
[25156] * Min threads: 5, max threads: 5
[25156] * Environment: development
[25156] * Process workers: 2
[25156] * Preloading application
[25156] * Listening on tcp://0.0.0.0:3000
Exiting
/home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:269:in `initialize': Address already in use - bind(2) for "0.0.0.0" port 3000 (Errno::EADDRINUSE)
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:269:in `new'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:269:in `add_tcp_listener'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:105:in `block in parse'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:88:in `each'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/binder.rb:88:in `parse'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/runner.rb:144:in `load_and_bind'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/cluster.rb:391:in `run'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/puma/launcher.rb:174:in `run'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/puma-3.9.1/lib/rack/handler/puma.rb:69:in `run'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/rack-2.0.5/lib/rack/server.rb:297:in `start'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:44:in `start'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:135:in `block in perform'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `tap'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands/server/server_command.rb:130:in `perform'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
    from /home/ahmed/Rails/sample_app/bin/rails:9:in `require'
    from /home/ahmed/Rails/sample_app/bin/rails:9:in `<top (required)>'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
    from /home/ahmed/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
    from /home/ahmed/.rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require'
    from /home/ahmed/.rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require'
    from /home/ahmed/Rails/sample_app/bin/spring:15:in `<top (required)>'
    from bin/rails:3:in `load'
    from bin/rails:3:in `<main>'

我认为有一些进程或某些东西在端口3000上运行，所以我尝试使用

找到它

lsof -wni tcp:3000

但命令没有返回，所以看起来很奇怪，任何解决方案？

更新＃1

我从stackoverflow上的另一个问题运行此代码，我得到了

➜  ~ sudo lsof -iTCP -sTCP:LISTEN -P | grep :3000
ruby      1595        beef-xss   17u  IPv4  32839      0t0  TCP *:3000 (LISTEN)

所以我试过

kill -9 1595

和

kill -9 32839

但没有任何效果

我也重新启动了我的电脑，但是存在同样的问题，我的＆＃34; tmp / pids＆＃34;中没有文件。文件夹

更新＃2

使用

卸载名为beef-xss的东西后解决了这个问题

sudo apt-get --purge remove beef-xss

Answer 1

如果您使用的是Linux操作系统

首先，我们将使用fuser命令识别哪些进程正在使用文件或套接字。

fuser -n tcp 3000
3000 / tcp: 7425

当我们想要识别使用TCP或UDP套接字的进程时，使用-n参数，在我的情况下，我想知道谁在使用端口3000.

该命令返回进程的pid，使用此数据并在ps命令的帮助下，我们将获得有关它的更多信息。

ps x | grep 7425
7425 pts / 3 Tl 1:15 /home/carlos/.rvm/rubies/ruby-1.9.3-p0/bin/ruby 
script / rails s

有了这个，我们看到rails测试服务器的一个实例被挂起，以释放我们使用我们已经拥有的pid杀死进程的端口。

kill -9 7425

然后我们看到这个过程确实已经完成。

ps x | grep 7425
7973 pts / 3 S + 0:00 grep --color = auto 7425
[1] + Finished (killed) rails s

我希望这对你有用

答案的文章http://community.logicalbricks.com/node/103

Answer 2

您是否尝试删除 tmp / pids 中的 pid 文件？如果文件夹中有任何内容，请尝试使用pgrep -lf puma查找 Puma 进程，并查看是否有任何进程。

Answer 3

我认为你在同一个端口上运行了另一台服务器并且你没有停止这一点，并且命令提示已关闭，这就是为什么它显示这个错误。因此，如果您restart计算机，则可以解决此问题。

只需重新启动计算机，然后重试。

此外，您可以尝试从tmp/pids/

中删除文件

Answer 4