Is it possible in python to kill process that is listening on specific port, for example 8080?

Question

Is it possible in python to kill a process that is listening on a specific port, say for example 8080?

I can do netstat -ltnp | grep 8080 and kill -9 <pid> OR execute a shell command from python but I wonder if there is already some module that contains API to kill process by port or name?

Answer 1

You could use the psutil python module. Some untested code that should point you in the right direction:

from psutil import process_iter
from signal import SIGTERM # or SIGKILL

for proc in process_iter():
    for conns in proc.connections(kind='inet'):
        if conns.laddr.port == 8080:
            proc.send_signal(SIGTERM) # or SIGKILL

Answer 2

You could this with a subprocess and then kill it.

import os
import signal
from subprocess import Popen, PIPE

port = 1234
process = Popen(["lsof", "-i", ":{0}".format(port)], stdout=PIPE, stderr=PIPE)
stdout, stderr = process.communicate()
for process in str(stdout.decode("utf-8")).split("\n")[1:]:       
    data = [x for x in process.split(" ") if x != '']
    if (len(data) <= 1):
        continue

    os.kill(int(data[1]), signal.SIGKILL)

Answer 3

The simplest way 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

The implementation details is available here: https://github.com/yashbathia/freeport/blob/master/scripts/freeport

Answer 4

I tried this method, it works for me..!

import os
import signal
import subprocess

command = "netstat -ano | findstr 8080"
c = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr = subprocess.PIPE)
stdout, stderr = c.communicate()
pid = int(stdout.decode().strip().split(' ')[-1])
os.kill(pid, signal.SIGTERM)

Answer 5

First of all, processes don't run on ports - processes can bind to specific ports. A specific port/IP combination can only be bound to by a single process at a given point in time.

As Toote says, psutil gives you the netstat functionality. You can also use os.kill to send the kill signal (or do it Toote's way).