Server is already running in Rails

Question

When I am starting rails server using rails s command it is showing A server is already running  Check C  Sites folder Pids Server pids  When I open the file it is outputting a 4 digit number only so how could I resolve this issue     FYI   No other instance of Rails cmd is running this time  Checked Task manager but only cmd exe is showing no else process is running   using Windows

User · Answer

Run  fuser -k -n tcp 3000  This will kill the process running at the default port 3000

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kill -9   lsof -i tcp 3000 -t

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You can get rid of the process by killing it   kill -9   lsof -i tcp 3000 -t

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Remove the file  C  Sites folder Pids Server pids  Explanation In UNIX land at least we usually track the process id  pid  in a file like server pid  I think this is doing the same thing here  That file was probably left over from a crash

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TL DR Just Run this command to Kill it  sudo kill -9   lsof -i  3000 -t    Root Cause  Because PID is locked in a file and web server thinks that if that file exists then it means it is already running  Normally when a web server is closed that file is deleted  but in some cases  proper deletion doesn t happen so you have to remove the file manually New Solutions   when you run rails s     Booting WEBrick     Rails 4 0 4 application starting in development on http   0 0 0 0 3000     Run rails server -h for more startup options     Ctrl-C to shutdown server  A server is already running  Check  your project path tmp pids server pid  Exiting  So place your path shown here  your project path tmp pids server pid   and remove this server pid file   rm  your project path tmp pids server pid   OR Incase you re server was detached then follow below guidelines   If you detached you rails server by using command  rails -d  then   Remove rails detached server by using command   ps -aef   grep rails   OR by this command  sudo lsof -wni tcp 3000   then  kill -9 pID   OR use this command  To find and kill process by port name on which that program is running  For 3000 replace port on which your program is running   sudo kill -9   lsof -i  3000 -t    Old Solution   rails s -p 4000 -P tmp pids server2 pid   Also you can find this post for more options Rails Update to 3 2 11 breaks running multiple servers

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It happens when you kill your server process and the pid file was not updated  The best solution is to delete the file Server pid   Use the command      rm  lt path to file Server pid gt

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I just had this issue and tried setting it to a different port  but the only thing I needed to do was to delete my  app directory  tmp pids server pid and everything was good to go

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If you are on Windows  you just need to do only one step as     rails restart   and then again type   rails s   You are good to go

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Probably you suspended the server by   Z    The four digital number that vim C  Sites folder Pids Server pidsoutputs is the process id    You should kill -9 processid  replacing the process id with the 4 numbers that vim  or other editor  outputed

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On Windows Rails 5 2  delete this file  c  Sites  lt your folder gt  tmp pids server pid   and run  rails s   again

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lsof -wni tcp 3000   Then you should see the ruby process and you can run  kill -9 processid   you should be good to run the process now  rails s thin   running multiple processes doesn t seem like a good idea and from what i ve read many people agree  I ve noticed many memory leaks with rails unfortunately so I couldn t imagine having two processes running  I know with one overtime my page refreshes increasingly become slower because of the data being stored on memory

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lsof -wni tcp 3000    Kill the running process   kill -9 5946    rm tmp server pids   foreman start etc start the service

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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

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Run      in Ubuntu linux   sudo rm  var www html rails WBPOCTEST tmp pids server pid   Or   pkill -9 ruby   or   lsof -wni tcp 3000  kill -9 pid

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Just open that C  Sites folder Pids Server pids and copy that 4 digit value that 4 digit value is nothing but a PID  which you need to kill to stop the already running process   then to stop the process use below command  kill -9  lt pid gt   once that already running process get stopped then hit rails s to start the rails server

[ruby-on-rails] Server is already running in Rails

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