http://javarevisited.blogspot.ca/2015/11/how-to-find-pid-of-process-listening-on-a-port-unix-netstat-lsof-command-examples.html
In Linux, many times, you want to find out the PID of a process which are listening on a port e.g. if multiple tomcat servers
are running on a host then, how do you find the PID of the tomcat
listening on port 8080? There are many UNIX commands to find the process
using a specific port, but I'll share what I use. I always use the netstat command with -p option, which displays process id of the process listening on a port. Btw, netstat is not the only command to find all processes using a particular port, you can also use lsof command for the same purpose. If you remember, we have used lsof
earlier to find all the processes accessing a file but it can also be
used to find all processes accessing a specific port. You will see the
example of both netstat and lsof commands in this article to find PID of process listening on a specific port in Linux.
here you go, 25414 is the PID of your tomcat server. Since tomcat is a Java web application it started with java command and that's why you see 25414/java.
Remember, if you are not logged in as root or the user under which your server is running, you might see following error:
No info could be read for "-p": geteuid()=XXX but you should be root
If you see this error, then just sudo as the user which is running the tomcat.
just remember to -i option and color (:) before the port i.e. :8080. Btw, if you don't find lsof command in your PATH, search in /usr/sbin, more often /usr/sbin is not added into user's PATH. In that you can run the command as shown below:
It will display the same result.
That's all about how to find the PID of the process listening on a port in UNIX or Linux. You can use both netstat and lsof command to get the PID, but I mostly use netstat because sometimes I don't remember the port but I know the PID. Since in the case of netstat I am just doing grep, even if give PID it will fetch the line from netstat output then I can get the port on which a particular process is listening. Anyway, I will show you a couple of more tricks to find the port on which a particular port is listening in next tutorial.
Here is the summary of how to find the process listening on a particular port in UNIX:
Related UNIX and Linux command tutorials for Java Programers:
Netstat command to find the PID of process listening on a port
So to find the PID of your Java server listening on port 8080, you can use following UNIX command:$ netstat -nap | grep 8080 (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 25414/java
here you go, 25414 is the PID of your tomcat server. Since tomcat is a Java web application it started with java command and that's why you see 25414/java.
Remember, if you are not logged in as root or the user under which your server is running, you might see following error:
No info could be read for "-p": geteuid()=XXX but you should be root
If you see this error, then just sudo as the user which is running the tomcat.
lsof command example to find the processes using a specific port
Here is the example of lsof command to list the process listening on a port.$ lsof -i :8080 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME java 25414 appuser 44u IPv4 3733348 TCP *:XXX (LISTEN)
just remember to -i option and color (:) before the port i.e. :8080. Btw, if you don't find lsof command in your PATH, search in /usr/sbin, more often /usr/sbin is not added into user's PATH. In that you can run the command as shown below:
$ /usr/sbin/lsof -i :8080 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME java 25414 appuser 44u IPv4 3733348 TCP *:XXX (LISTEN)
It will display the same result.
That's all about how to find the PID of the process listening on a port in UNIX or Linux. You can use both netstat and lsof command to get the PID, but I mostly use netstat because sometimes I don't remember the port but I know the PID. Since in the case of netstat I am just doing grep, even if give PID it will fetch the line from netstat output then I can get the port on which a particular process is listening. Anyway, I will show you a couple of more tricks to find the port on which a particular port is listening in next tutorial.
Here is the summary of how to find the process listening on a particular port in UNIX:
Related UNIX and Linux command tutorials for Java Programers:
- 10 examples of find command in UNIX (examples)
- How to call REST web service from UNIX command line? (command)
- 10 examples of grep command in UNIX (examples)
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- 10 tips to work fast in UNIX? (tips)
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