运行Rails server时，出 Error:Address already in use错误

运行dev@ubuntu:~/qq$ rails server
出错

[2013-07-30 16:29:23] WARN  TCPServer Error: Address already in use - bind(2)
Exiting
/home/dev/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/utils.rb:85:in `initialize': Address already in use - bind(2) (Errno::EADDRINUSE)

解决办法：

终端运行 dev@ubuntu:~/qq$ lsof|grep 3000

显示

ruby       3365              dev    6u     IPv4              22026      0t0     TCP *:3000 (LISTEN)
ruby       3365  3367        dev    6u     IPv4              22026      0t0     TCP *:3000 (LISTEN)
ruby       3365  3369        dev    6u     IPv4              22026      0t

终端运行 dev@ubuntu:~/qq$ kill -9 3365 杀死占用端口的进程

运行dev@ubuntu:~/qq$ lsof|grep 3000
dev@ubuntu:~/qq$ rails server
=> Booting WEBrick
=> Rails 3.2.13 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2013-07-30 16:32:03] INFO  WEBrick 1.3.1
[2013-07-30 16:32:03] INFO  ruby 1.9.3 (2013-06-27) [x86_64-linux]
[2013-07-30 16:32:03] INFO  WEBrick::HTTPServer#start: pid=11424 port=3000

Started GET "/assets/rails.png" for 127.0.0.1 at 2013-07-30 16:32:27 +0800
Served asset /rails.png - 200 OK (68ms)
问题解决！