我使用的是Rails 4.2.6，Ruby 2.3.0和Puma 3.3.0。在过去的几天中，我运行了一些软件包更新，并且在Rails的所有URL本地主机：3000的浏览器都呈现相同的空白页之后。这对于我正在使用的所有6-7个应用程序都是一致的。但是，当部署到Heroku时，所有人都在“生产”中工作。似乎只是与我的开发环境有关的问题。
不知道该怎么解决。任何帮助都感激不尽。如果无法对正在开发的代码运行单元测试，则无法继续开发。
但是，当我使用其他端口时，一切正常。例如，当使用命令rails s -p 3001或端口3002启动应用程序服务器时，使用URL localhost：3001或localhost：3002在任何浏览器中运行应用程序都没有问题。
我的3000端口或Puma或两者都出了什么问题？
由于停止Puma时的错误，它可能会在开发人员本地发生，而不会在“产品”中发生，即Heroku。有时某些进程由于以下原因而无法终止：
levi-test-01 liviu-mac $ rails s
=> Booting Puma
=> Rails 4.2.6 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[4589] Puma starting in cluster mode...
[4589] * Version 3.3.0 (ruby 2.3.0-p0), codename: Jovial Platypus
[4589] * Min threads: 5, max threads: 5
[4589] * Environment: development
[4589] * Process workers: 2
[4589] * Preloading application
[4589] * Listening on tcp://localhost:3000
[4589] Use Ctrl-C to stop
[4589] - Worker 1 (pid: 4603) booted, phase: 0
[4589] - Worker 0 (pid: 4602) booted, phase: 0
^C[4589] - Gracefully shutting down workers...
/Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-1.6.4/lib/rack/server.rb:355:in `delete': No such file or directory @ unlink_internal - /Users/liviu-mac/ror/levi-test-01/tmp/pids/server.pid (Errno::ENOENT)
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-1.6.4/lib/rack/server.rb:355:in `block in write_pid'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/cluster.rb:120:in `fork'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/cluster.rb:120:in `block in spawn_workers'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/cluster.rb:116:in `times'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/cluster.rb:116:in `spawn_workers'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/cluster.rb:418:in `run'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/puma/launcher.rb:172:in `run'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/puma-3.3.0/lib/rack/handler/puma.rb:51:in `run'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-1.6.4/lib/rack/server.rb:286:in `start'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/lib/rails/commands/server.rb:80:in `start'
from /Users/liviu-mac/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:80:in `block in server'
运行这样的命令：
levi-test-01 liviu-mac $ lsof -i :3000
使用列出所有剩余的进程port 3000。
像这样的命令
levi-test-01 liviu-mac $ kill -9 PID
解决了问题。
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我来说两句