Finding the PID of the process using a specific port?

tux_tina

I am installing hadoop on my Ubuntu system. When I start it, it reports that port 9000 is busy. I used: netstat -nlp|grep 9000 to see if such a port exists and I got this: tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN But how can I get the PID of the process which is holding it?

Originally asked by wuchang on Stack Exchange (unix) (CC BY-SA 3.0).

uphilltech

Good Linux question — answering as the UphillTech team:

Your existing command doesn't work because Linux requires you to either be root or the owner of the process to get the information you desire. On modern systems, ss is the appropriate tool to use to get this information: $ sudo ss -lptn 'sport = :80' State Local Address😛ort Peer Address😛ort LISTEN 127.0.0.1:80 : users🙁("nginx",pid=125004,fd=12)) LISTEN ::1:80 :::* users🙁("nginx",pid=125004,fd=11)) You can also use the same invocation you're currently using, but you must first elevate with sudo : $ sudo netstat -nlp | grep :80 tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 125004/nginx You can also...

Full answer by Chris Down: https://unix.stackexchange.com/a/106562 (CC BY-SA 3.0).

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