A server is already running Check tmp pids server pid Exiting - rails

Question

rails s   gt  Booting WEBrick   gt  Rails 4 0 4 application starting in development on http   0 0 0 0 3000   gt  Run  rails server -h  for more startup options   gt  Ctrl-C to shutdown server A server is already running  Check  home   name rprojects railsapp tmp pids server pid  Exiting   what is the easiest way to solve this for a rails beginner

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You can delete the server pid file   rm  your project path tmp pids server pid     Else   try in OSX   sudo lsof -iTCP -sTCP LISTEN -P   grep  3000   or in linux   ps -aef   grep rails  or   lsof -wni tcp 3000   kill the process using   kill -9 PID  eg 2786

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Short and Crisp single line command  that will take care of it   kill -9   lsof -i tcp 3000 -t

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Run this command -  x000D   x000D  lsof -wni tcp 3000 x000D   x000D   x000D   then you will get the following table -  x000D   x000D  COMMAND  PID  USER   FD   TYPE DEVICE SIZE OFF NODE NAME ruby    2552 shyam   17u  IPv4  44599      0t0  TCP 127 0 0 1 3000  LISTEN  ruby    2552 shyam   18u  IPv6  44600      0t0  TCP    1  3000  LISTEN  x000D   x000D   x000D   Run this command and replace PID from the Above table  x000D   x000D  kill -9 PID x000D   x000D   x000D   example   x000D   x000D  kill -9 2552 x000D   x000D   x000D

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It happens sometimes because you turn off the server by force  for example turning off the OS machine manually so that the server does not have enough time to log to server pid    One easy way is to manually go to tmp pids   the directory that is shown in your console   and remove server pid file  Then  when you start the server again  rails server or rails s  it creates a new server pid and you can continue development

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Kill server pid by using command   kill -9  cat  root myapp tmp pids server pid    Note  Use your server pid path which display in console terminal   Thank you

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the gui way for Windows user  open the ResourceMonitor   taskmanager - Performance -  ResourceMonitor  and kill the ruby exe process

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Issue can be solved using   kill -9   more  home   name rprojects railsapp tmp pids server pid

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server pid only contains the process ID of the running server   If you do   more  your project path tmp pids server pid   you will get a number  say 6745  which you can use to stop the previous server with the command kill   kill -9 6745   and then you can remove the file with the rm command  rm  your project path tmp pids server pid

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SOLUTION for Windows    see the pid from  tmp pids server pid  open cmd as administrator taskkill  F  PID  pid from step 1   delete server pid file restart server

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SOLVING    Address already in use     bind 2     500 error in Ruby on Rails   Recently I tried running a Rails app on a production server  Not only did it not work  but it broke my localhost 3000 development server as well  Localhost would only load a blank white page or a 500 error   To solve this  I used two quick commands  If these don   t return a result  you may need to look elsewhere for a solution  but this is a good quick fix    lsof -wni tcp 3000     ruby    52179 rachelchervin   50u  IPv6 0x   7aa3      0t0  TCP    1  hbci  LISTEN  ruby    52179 rachelchervin   51u  IPv4 0x   c7bb      0t0  TCP 127 0 0 1 hbci  LISTEN  ruby    52180 rachelchervin   50u  IPv6 0x   7aa3      0t0  TCP    1  hbci  LISTEN  ruby    52180 rachelchervin   51u  IPv4 0x   c7bb      0t0  TCP 127 0 0 1 hbci  LISTEN     This command shows all of my currently running processes and their PIDs  process IDs  on the 3000 port  Because there are existing running processes that did not close correctly  my new  3000 server can   t start  hence the 500 error    kill 52179    kill 52180    rails s   I used the Linux kill command to manually stop the offending processes  If you have more than 4  simply use kill on any PIDs until the first command comes back blank  Then  try restarting your localhost 3000 server again  This will not damage your computer  It simply kills existing ruby processes on your localhost port  A new server will start these processes all over again  Good luck

User · Answer

Simple   go in the root folder of the project when this happens and run   gem install shutup shutup   This will find the process currently running  kill it and clean up the pid file  NOTE  if you are using rvm install the gem globally   rvm  global do gem install shutup

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For added information  under the context of running the application in docker   In docker-compose yml file  under the application container itself  you can use one of the following   command    rm  your-app-path tmp pids server pid  amp  amp  bundle exec bin rails s -p 3000 -b  0 0 0 0      or  command    rm  your-app-path tmp pids server pid  foreman start     Note the use of either   or  amp  amp   that  amp  amp  will send an exit signal if rm fails to find the file  forcing your container to prematurely stop  Using   will continue to execute   Why is this caused in the first place  The rationale is that if the server  puma thin whatever  does not cleanly exit  it will leave a pid in the host machine causing an exit error   For portability rather than manually deleting the file on the host system  it s better to check if the file exists within scripted or compose file itself

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Run given below command on terminal   for linux only    ps aux   grep rails   and then   kill -9  pid    Another way   lsof -wni tcp 3000   and then  kill -9  PID

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For ubuntu 20  kill -9   ps -aef   grep rails

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First Find PID   - where the Rails Server got stuck on Run this to find the stuck PID cat   tmp pids server pid It will return something like 65829 Then KILL that PID   gt  kill 65829

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If you are using docker-compose  and in docker-compose yml have   volumes    -    myapp  That means you local workspace is mapped to the container s  myapp folder   Anything in  myapp will not be deleted for the volumes define   You can delete   tmp pids server pid in you local machine  Then the container s  myapp will not have this file

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For this problem   What i did is    Delete the Pids folder which is located under app tmp  and then  close the terminal which we are running the current app and close the tab  in  browser window  after that  again open the terminal by going inside the folder  and then do  rails s Then  it opens the fresh tab which is running our application

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Open the path to your rails project tmp pids server pid file   Copy the number you find therein   Run kill -9  PID   Where  PID  is the number you copied from the server pid file   This will kill the running server process and you can start your server again without any trouble

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first copy the cumber inside the file then remove it   rm  your project path tmp pids server pid then create it again  touch  YOUR PROJECT PATH tmp pids server pid It worked for me

[ruby-on-rails] A server is already running. Check …/tmp/pids/server.pid. Exiting - rails

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