Find and kill process locking port 3000 on Mac

Question

How do I find  and kill  processes that listen to use my tcp ports  I m on mac os x   Sometimes  after a crash or some bug  my rails app is locking port 3000  I can t find it using ps -ef     When doing  rails server   I get     Address already in use - bind 2   Errno  EADDRINUSE    2014 update   To complete some of the answers below  After executing the kill commands  deleting the pid file might be necessary rm   mypath myrailsapp tmp pids server pid

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You can try this   netstat -vanp tcp   grep 3000

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A one-liner to extract the PID of the process using port 3000 and kill it   lsof -ti 3000   xargs kill   The -t flag removes everything but the PID from the lsof output  making it easy to kill it

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TL DR   lsof -ti tcp 3000 -sTCP LISTEN   xargs kill   If you re in a situation where there are both clients and servers using the port  e g      lsof -i tcp 3000 COMMAND     PID         USER   FD   TYPE             DEVICE SIZE OFF NODE NAME node       2043 benjiegillam   21u  IPv4 0xb1b4330c68e5ad61      0t0  TCP localhost 3000- gt localhost 52557  ESTABLISHED  node       2043 benjiegillam   22u  IPv4 0xb1b4330c8d393021      0t0  TCP localhost 3000- gt localhost 52344  ESTABLISHED  node       2043 benjiegillam   25u  IPv4 0xb1b4330c8eaf16c1      0t0  TCP localhost 3000  LISTEN  Google    99004 benjiegillam  125u  IPv4 0xb1b4330c8bb05021      0t0  TCP localhost 52557- gt localhost 3000  ESTABLISHED  Google    99004 benjiegillam  216u  IPv4 0xb1b4330c8e5ea6c1      0t0  TCP localhost 52344- gt localhost 3000  ESTABLISHED    then you probably don t want to kill both   In this situation you can use -sTCP LISTEN to only show the pid of processes that are listening  Combining this with the -t terse format you can automatically kill the process   lsof -ti tcp 3000 -sTCP LISTEN   xargs kill

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This single command line is easy to remember    npx kill-port 3000  For a more powerful tool with search   npx fkill-cli     PS  They use third party javascript packages  npx comes built in with Node js   Sources   tweet   github

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You can use lsof -i 3000   That is  List Open Files   This gives you a list of the processes and which files and ports they use

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lsof -i tcp port number - will list the process running on that port   kill -9 PID - will kill the process  in your case  it will  be  lsof -i tcp 3000 from your terminal find the PID of process  kill -9 PID

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To view the processes blocking the port   netstat -vanp tcp   grep 3000  To Kill the processes blocking the port   kill   lsof -t -i  3000

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Execute in command line on OS-X El Captain   kill -kill  lsof -t -i tcp 3000    Terse option of lsof returns just the PID

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Find   sudo lsof -i  3000   Kill   kill -9  lt PID gt

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You can try netstat  netstat -vanp tcp   grep 3000   For macOS El Capitan and newer  or if your netstat doesn t support -p   use lsof  lsof -i tcp 3000    For Centos 7 use   netstat -vanp --tcp   grep 3000

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In mac OS   kill -9   lsof -i TCP 3000   grep LISTEN   awk   print  2

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I made a little function for this  add it to your rc file   bashrc   zshrc or whatever   function kill-by-port     if     1            then     kill -9   lsof -ni tcp   1    awk  FNR  2 print  2      else     echo  Missing argument  Usage  kill-by-port  PORT    fi     then you can just type kill-by-port 3000 to kill your rails server  substituting 3000 for whatever port it s running on   failing that  you could always just type kill -9   cat tmp pids server pid  from the rails root directory

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One of the ways to kill a process on a port is to use the python library  freeport  https   pypi python org pypi freeport 0 1 9    Once installed  simply     install freeport pip install freeport    Once freeport is installed  use it as follows   freeport 3000 Port 3000 is free  Process 16130 killed successfully

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If you want a code free way - open activity manager and force kill node

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These two commands will help you find and kill server process        lsof -wni tcp 3000   kill -9 pid

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Nothing above worked for me  Anyone else with my experience could try the following  worked for me    Run   lsof -i  3000  where 3000 is your current port in use    then check status of the reported PID    ps ax   grep  lt PID gt    finally   begone with it    kill -QUIT  lt PID gt

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Possible ways to achieve this    top  The top command is the traditional way to view your system   s resource usage and see the processes that are taking up the most system resources  Top displays a list of processes  with the ones using the most CPU at the top   ps  The ps command lists running processes  The following command lists all processes running on your system   ps -A   You could also pipe the output through grep to search for a specific process without using any other commands  The following command would search for the Firefox process   ps -A   grep firefox   The most common way of passing signals to a program is with the kill command   kill PID of target process   lsof  List of all open files and the processes that opened them   lsof -i -P   grep -i  listen  kill -9 PID   or   lsof -i tcp 3000

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Here s a helper bash function to kill multiple processes by name or port  fkill       for i in    do export q  i if     i          then lsof -i i sed -n  1 p     else ps aux grep -i  i grep -v grep fi awk   print  2       xargs -I  sh -c  kill -9   amp  amp printf  X  s- gt  s n   q    done     Usage     fkill  process name   process port    Example     fkill someapp  8080 node  3333  9000

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Find and kill   This single command line is easy and works correctly    kill -9   lsof -ti tcp 3000

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Step 1  Find server which are running  ps aux   grep puma Step 2  Kill those server Kill -9  server number

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Works for me for terminating node  Mac OS Catalina  killall -9 node

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I use this   cat tmp pids server pid   pbcopy  Then kill -9  paste

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In your  bash profile  create a shortcut for terminate the 3000 process   terminate      lsof -P   grep   3000    awk   print  2     xargs kill -9      Then  call  terminate if it s blocked

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Using sindresorhus s fkill tool  you can do this     fkill  3000

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Add to    bash profile   function killTcpListen        kill -QUIT   sudo lsof -sTCP LISTEN -i tcp  1 -t      Then source    bash profile and run  killTcpListen 8080

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To forcefully kill a process like that  use the following command   lsof -n -i4TCP 3000    Where 3000 is the port number the process is running at  this returns the process id PID  and run   kill -9  PID    Replace PID with the number you get after running the first command

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You should try this  This technique is OS Independent   In side your application there is a folder called tmp  inside that there is an another folder called pids   That file contains the server pid file  Simply delete that file  port automatically kill itself   I think this is the easy way

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To kill multi ports     npx kill-port 3000 8080 8081  Process on port 3000 killed Process on port 8080 killed Process on port 8081 killed   Hope this help

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Find the open connection      lsof -i -P   grep -i  listen    Kill by process ID     kill -9  PID

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You should try this code using the terminal     killall -9 ruby

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lsof -P   grep   3000    awk   print  2     This will give you just the pid  tested on MacOS

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Easiest solution  kill   lsof -ti 3000 3001 8080   For single port  kill   lsof -ti 3000    3000 is the port to be freed Kill multiple ports with single line command  kill   lsof -ti 3000 3001    here multiple ports 3000 and 3001 are the ports to be freed  lsof -ti 3000  82500  Process ID   lsof -ti 3001  82499  lsof -ti 3001 3000  82499 82500  kill   lsof -ti 3001 3000   Terminates both 82499 and 82500 processes in a single command  For using this in package json scripts   quot scripts quot      quot start quot    quot kill   lsof -ti 3000 3001   amp  amp  npm start quot

[macos] Find (and kill) process locking port 3000 on Mac

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