Rails server says port already used, how to kill that process?
ruby-on-rails
Solution
Assuming you're looking to kill whatever is on port 3000 (which is what webrick normally uses), type this in your terminal to find out the PID of the process:
$ lsof -wni tcp:3000
Then, use the number in the PID column to kill the process:
$ kill -9 PID
Problem
I'm on a mac, doing: ``` rails server ``` I get: ``` 2010-12-17 12:35:15] INFO WEBrick 1.3.1 [2010-12-17 12:35:15] INFO ruby 1.8.7 (2010-08-16) [i686-darwin10.4.0] [2010-12-17 12:35:15] WARN TCPServer Error: Address already in use - bind(2) Exiting ``` I know I can start one on a new port, but I want to kill this process.