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Sunday, September 10, 2017

How To Find And Kill Application / Process Running On Particular Port In Linux Systems

How To Find And Kill Application / Process Running On Particular Port In Linux Systems



Today, I'm going to show you how to find and kill application / process running on particular port in Linux Systems.

We can use lsof command to find the process running on particular port. The syntax of lsof command to find the application running on particular port looks like following..

lsof -i:port

Summary of above code...
lsof command is used to list open files.. and the argument -i is used to list files whose ip address / port matched to specified ip address / port.

Note: If you ignore ip address / port after -i then the above command will lists processes for all ip addresses...

For example to find the process / application listening on port 80, run the following code..

lsof -i :80

The output will looks like following..

shivaraj@shivaraj-A14RM0E:~$ lsof -i:80 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME plugin_ho 3981 shivaraj 20u IPv4 420822 0t0 TCP 192.168.0.117:33104->45.55.41.223:http (CLOSE_WAIT) shivaraj@shivaraj-A14RM0E:~$

If you omit port value... lsof -i the output will looks like following one..

shivaraj@shivaraj-A14RM0E:~$ lsof -i COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME plugin_ho 3981 shivaraj 20u IPv4 420822 0t0 TCP 192.168.0.117:33104->45.55.41.223:http (CLOSE_WAIT) node 4165 shivaraj 12u IPv4 509873 0t0 TCP *:http-alt (LISTEN) firefox 4178 shivaraj 114u IPv4 7216095 0t0 TCP 192.168.0.117:42436->server-54-230-190-100.maa3.r.cloudfront.net:https (ESTABLISHED) shivaraj@shivaraj-A14RM0E:~$

Now, we are going to see how to kill the process which is listening on particular port.. If we can find the pid of process we can pipe it to kill command. so that we cann kill the process listening on particular port..

By specifying -t for lsof command we can get pid of process listening on particular port... Look at the below command signature..

lsof -t -i :port

If you want to find out pid of process listening on port 80, run the following code..

lsof -t -i :80

The above commands output will looks like..

shivaraj@shivaraj-A14RM0E:~$ lsof -t -i :80 3981 shivaraj@shivaraj-A14RM0E:~$

To kill the process listening on port 80, pass the output of above command to kill command...

sudo kill $(lsof -t -i :80)

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