How can I clear the process running on my target port?-CodePudding

FINAL UPDATE: Ture Pålsson SOLVED MY ISSUE. THANKS SO MUCH ALL FOR YOUR HELP!

I've been following along with this article, trying to create my first Flask API from scratch. I had to update my computer in the middle of my work and I don't think I successfully closed the terminal beforehand.

When I try to run my application now from the home directory of my project, in the section titled "Creating a RESTful Endpoint with Flask", I get a long stack trace ending with this:

  File "/usr/local/Cellar/[email protected]/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/socketserver.py", line 466, in server_bind
    self.socket.bind(self.server_address)
OSError: [Errno 48] Address already in use

Other similar questions which indicated this is due to another process using the port I'm trying to access. To solve this, I've used the command:

ps -fA | grep python

Which returns:

501 12797 12759   0 11:15PM ??         0:03.97 /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper (Renderer).app/Contents/MacOS/Code Helper (Renderer) --ms-enable-electron-run-as-node /Users/nfeldman1995/.vscode/extensions/ms-python.vscode-pylance-2021.12.0/dist/server.bundle.js --cancellationReceive=file:50e28be741e040fa2f7efc8dbdcf8a4ca200512639 --node-ipc --clientProcessId=12759
501 13126 12421   0 11:30PM ttys000    0:00.00 grep python

This is what I find so confusing. Other articles indicate I should see a line with the output along the lines of:

 502 89332 12877 0 3:40PM ttys00 0:00.15 python -m SimpleHTTPServer

However, nothing in this output seems to be running "SimpleHTTPServer" so I don't know what process to kill. I've tried killing both of the other tasks with the command kill <process#> but this hasn't solved the problem.

Going to localhost:5000 (The port I'm trying to target) gives me a 404 error.

UPDATE: Here is the output for lsof -i :5000

COMMAND     PID         USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
ControlCe 13218 nfeldman1995   27u  IPv4 0xdf2d97d6ad526f5      0t0  TCP *:commplex-main (LISTEN)
ControlCe 13218 nfeldman1995   28u  IPv6 0xdf2d97d52942a1d      0t0  TCP *:commplex-main (LISTEN)

I tried running kill -9 13218 and running my application again and got the same error. Running lsof, then killing the process (or so I thought), then running lsof again seems to indicate new processes keep getting created. (With different process ID numbers).

Here is my bootstrap.sh file, as requested by Jon:

#!/bin/sh
export FLASK_APP=./cashman/index.py
source $(pipenv --venv)/bin/activate
flask run -h 0.0.0.0

CodePudding user response：

The problem with port 5000 on newer versions of macOS is that AirPlay uses it; that's why you see "ControlCenter" listening on the port. To get rid of it, go into System settings and turn off "AirPlay receiver" or something like that (I can't tell exactly; I'm on a too old computer at the moment). Googling "macos port 5000" turns up several hits.

CodePudding user response：

You can use lsof to list the processes, their PIDs and the TCP ports they are listening on with a command like this:

sudo lsof -iTCP -sTCP:LISTEN -P -n