Rails server says port already used how to kill that process

Question

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

User · Accepted Answer

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

User · Answer

By default  rails server uses port 3000  So  you have 2 options to run rails server  1  Either you can run the server on other port by defining custom port using the following command rails s -p 3001 2  Or you can kill all the running ruby process by running following command killall -9 ruby then run rails server

User · Answer

Using this command you can kill the server  ps aux grep rails

User · Answer

You need to get process id of program using tcp port 3000  To get process id  lsof -i tcp 3000 -t   And then using that process id  simply kill process using ubuntu kill command   kill -9 pid   Or just run below mentioned combine command  It will first fetch pid and then kill that process   kill -9   lsof -i tcp 3000 -t

User · Answer

One line solution   kill -9   ps aux   grep  rails s    awk   print 2     rails s

User · Answer

All the answers above are really good but I needed a way to type as little as possible in the terminal so I created a gem for that  You can install the gem only once and run the command  shutup  every time you wanna kill the Rails process  while being in the current folder     gem install shutup  then go in the current folder of your rails project and run   shutup   this will kill the Rails process currently running  You can use the command  shutup  every time you want  DICLAIMER  I am the creator of this gem  NOTE  if you are using rvm install the gem globally   rvm  global do gem install shutup

User · Answer

Some times there is a chance where rails server not closed properly  You can find process used by rails     ps aux   grep rails   Output will be like   user     12609  9 8  0 5  66456 45480 pts 0    Sl   21 06   0 02  home user  rvm rubies ruby-2 2 0-preview1 bin ruby bin rails s   Here process id 12609 is used by your rails server   You can kill it easily by command     kill -9 12609

User · Answer

If you are on windows machine follow these steps   c  project  cd tmp c  project tmp cd pids c  project tmp pids dir   There you will a file called server pid  delete it   c  project tmp pid gt  del   pid   Thats it   EDIT  Please refer this

User · Answer

kill -9   lsof -i tcp 3000 -t

User · Answer

For anyone stumbling across this question that is not on a Mac  assuming you know that your server is running on port 3000  you can do this in one shot by executing the following   fuser -k 3000 tcp   But as Toby has mentioned  the implementation of fuser in Mac OS is rather primitive and this command will not work on mac

User · Answer

To kill process on a specific port  you can try this npx kill-port  port-number

User · Answer

Type in   man lsof   Then look for -w  -n  and -i   -i  internet stuff -n  makes it faster -w  toggles warnings  There are WAY more details on the man pages

[ruby-on-rails] Rails server says port already used, how to kill that process?

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