0

This is my problem. I'm running a Node.JS API on a Debian server using Nodemon (Because I'm currently programming on my server) and that API is on a Apache Virtual Host using a reverse proxy.

I use nodemon because every change that I make to my code restarts my node.js app but sometimes it fails, and a error occurs that says that there is already a software running on that port (my port is 7000) so I stop nodemon and I kill the process.

$ sudo lsof -n -i :7000 | grep node
node    70690     root   43u  IPv6 112373950      0t0  TCP *:afs3-fileserver (LISTEN)

$ sudo kill 9 70690

First I use lsof to find the PID that runs over the port 7000 and then I use kill that PID. But if I don't use grep along with lsof it gives me more than one PID running on that port.

 $ sudo lsof -n -i :7000 
COMMAND   PID     USER   FD   TYPE    DEVICE SIZE/OFF NODE NAME
apache2 69823 www-data   21u  IPv4 112364929      0t0  TCP 127.0.0.1:55210->127.0.0.1:afs3-fileserver (CLOSE_WAIT)
apache2 69825 www-data   21u  IPv4 112364926      0t0  TCP 127.0.0.1:55208->127.0.0.1:afs3-fileserver (CLOSE_WAIT)
apache2 70051 www-data   21u  IPv4 112365069      0t0  TCP 127.0.0.1:55232->127.0.0.1:afs3-fileserver (CLOSE_WAIT)
node    70690     root   43u  IPv6 112373950      0t0  TCP *:afs3-fileserver (LISTEN)

I would like to use $ sudo lsof -ti :7000 to get only the list of PID and then use that with xargs to kill them all. But I don't know if that would cause problems because according to the latest command some of these process are from apache2.

Improve this question
5
  • The question you want to ask is, is it safe to kill these processes? (The ports themselves can't get "hurt" by killing a process, but the process can lose data.) However, the question you should ask yourself is, How do I reserve the port I want, so nothing else uses it? You probably need to reconfigure apache and/or this afs3 fileserver application... or, just choose another, unused port.
    – jpaugh
    Oct 30, 2019 at 16:09
  • 1
    You are listing both ipv4 and ipv6 sockets at port 7000. It looks like you want just the ipv6 ones (-i6 flag for lsof). But it's not a good idea to have different processes listening on the same port on different stacks (because one day you could decide to go dual-stack). You might consider moving one of them to their own port.
    – Eduardo Trápani
    Oct 30, 2019 at 16:11
  • @EduardoTrápani It looks to me that this already is dual-stack. Check the string on the end of the IPv4 address: 127.0.0.1:afs3-fileserver . But, your comment is still useful; I didn't even realize it was IPv6 at first.
    – jpaugh
    Oct 30, 2019 at 16:12
  • @jpaug I meant dual-stacking the service (ie, listening on both stacks). The system is obviously already using both stacks.
    – Eduardo Trápani
    Oct 30, 2019 at 16:14
  • @EduardoTrápani Nevermind, I was misreading the output of that command. I realize now that :adfs3-fileserver just meant port 7000.
    – jpaugh
    Oct 30, 2019 at 16:19

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.