How to stop flask application without using ctrl-c

Question

I want to implement a command which can stop flask application by using flask-script  I have searched the solution for a while  Because the framework doesn t provide  app stop    API  I am curious about how to code this  I am working on Ubuntu 12 10 and Python 2 7 3

User · Answer

For Windows  it is quite easy to stop kill flask server -    Goto Task Manager  Find flask exe  Select and End process

User · Answer

If you are just running the server on your desktop  you can expose an endpoint to kill the server  read more at Shutdown The Simple Server   from flask import request def shutdown server        func   request environ get  werkzeug server shutdown       if func is None          raise RuntimeError  Not running with the Werkzeug Server       func         app route   shutdown   methods   GET    def shutdown        shutdown server       return  Server shutting down           Here is another approach that is more contained  from multiprocessing import Process  server   Process target app run  server start         server terminate   server join    Let me know if this helps

User · Answer

As others have pointed out  you can only use werkzeug server shutdown from a request handler  The only way I ve found to shut down the server at another time is to send a request to yourself  For example  the  kill handler in this snippet will kill the dev server unless another request comes in during the next second   import requests from threading import Timer from flask import request import time  LAST REQUEST MS   0  app before request def update last request ms        global LAST REQUEST MS     LAST REQUEST MS   time time     1000    app route   seriouslykill   methods   POST    def seriouslykill        func   request environ get  werkzeug server shutdown       if func is None          raise RuntimeError  Not running with the Werkzeug Server       func       return  Shutting down        app route   kill   methods   POST    def kill        last ms   LAST REQUEST MS     def shutdown            if LAST REQUEST MS  lt   last ms     subsequent requests abort shutdown             requests post  http   localhost 5000 seriouslykill           else              pass      Timer 1 0  shutdown  start      wait 1 second     return  Shutting down

User · Answer

If you re outside the request-response handling  you can still   import os import signal  sig   getattr signal   SIGKILL   signal SIGTERM  os kill os getpid    sig

User · Answer

You can use method bellow  app do teardown appcontext

User · Answer

Google Cloud VM instance   Flask App I hosted my Flask Application on Google Cloud Platform Virtual Machine  I started the app using python main py But the problem was ctrl c did not work to stop the server  This command   sudo netstat -tulnp   grep  5000 terminates the server  My Flask app runs on port 5000 by default  Note  My VM instance is running on Linux 9  It works for this  Haven t tested for other platforms  Feel free to update or comment if it works for other versions too

User · Answer

My method can be proceeded via bash terminal console  1  run and get the process number    ps aux   grep yourAppKeywords   2a  kill the process    kill processNum   2b  kill the process if above not working    kill -9 processNum

User · Answer

If you re working on the CLI and only have one flask app process running  or rather  you just want want to kill any flask process running on your system   you can kill it with    kill   pgrep -f flask

User · Answer

I did it slightly different using threads  from werkzeug serving import make server  class ServerThread threading Thread        def   init   self  app           threading Thread   init   self          self srv   make server  127 0 0 1   5000  app          self ctx   app app context           self ctx push        def run self           log info  starting server           self srv serve forever        def shutdown self           self srv shutdown    def start server        global server     app   flask Flask  myapp               server   ServerThread app      server start       log info  server started    def stop server        global server     server shutdown     I use it to do end to end tests for restful api  where I can send requests using the python requests library

User · Answer

This is a bit old thread  but if someone experimenting  learning  or testing basic flask app  started from a script that runs in the background  the quickest way to stop it is to kill the process running on the port you are running your app on  Note  I am aware the author is looking for a way not to kill or stop the app  But this may help someone who is learning   sudo netstat -tulnp   grep  5001   You ll get something like this      tcp     0     0 0 0 0 0 5001     0 0 0 0      LISTEN    28834 python   To stop the app  kill the process  sudo kill 28834

User · Answer

You don t have to press  CTRL-C   but you can provide an endpoint which does it for you   from flask import Flask  jsonify  request import json  os  signal   app route   stopServer   methods   GET    def stopServer        os kill os getpid    signal SIGINT      return jsonify    success   True   message    Server is shutting down          Now you can just call this endpoint to gracefully shutdown the server   curl localhost 5000 stopServer

User · Answer

If someone else is looking how to stop Flask server inside win32 service - here it is  It s kinda weird combination of several approaches  but it works well  Key ideas   These is shutdown endpoint which can be used for graceful shutdown  Note  it relies on request environ get which is usable only inside web request s context  inside  app route-ed function  win32service s SvcStop method uses requests to do HTTP request to the service itself   myservice svc py import win32service import win32serviceutil import win32event import servicemanager import time import traceback import os  import myservice   class MyServiceSvc win32serviceutil ServiceFramework        svc name     quot MyServiceSvc quot                          NET START STOP the service by the following name      svc display name     quot Display name quot     this text shows up as the service name in the SCM      svc description     quot Description quot    this text shows up as the description in the SCM      def   init   self  args           os chdir os path dirname myservice   file             win32serviceutil ServiceFramework   init   self  args       def SvcDoRun self                 some code skipped         myservice start        def SvcStop self            quot  quot  quot Called when we re being shut down quot  quot  quot          myservice stop             tell the SCM we re shutting down         self ReportServiceStatus win32service SERVICE STOP PENDING          servicemanager LogMsg servicemanager EVENTLOG INFORMATION TYPE                                servicemanager PYS SERVICE STOPPED                                 self  svc name         if   name         main         os chdir os path dirname myservice   file         win32serviceutil HandleCommandLine MyServiceSvc   myservice py from flask import Flask  request  jsonify    Workaround - otherwise doesn t work in windows service  cli   sys modules  flask cli   cli show server banner   lambda  x  None  app   Flask  MyService          business logic endpoints are skipped    app route  quot  shutdown quot   methods   GET    def shutdown        shutdown func   request environ get  werkzeug server shutdown       if shutdown func is None          raise RuntimeError  Not running werkzeug       shutdown func       return  quot Shutting down    quot    def start        app run host  0 0 0 0   threaded True  port 5001    def stop        import requests     resp   requests get  http   localhost 5001 shutdown

User · Answer

This is an old question  but googling didn t give me any insight in how to accomplish this   Because I didn t read the code here properly   Doh   What it does is to raise a RuntimeError when there is no werkzeug server shutdown in the request environ     So what we can do when there is no request is to raise a RuntimeError  def shutdown        raise RuntimeError  Server going down     and catch that when app run   returns       try      app run host  0 0 0 0   except RuntimeError  msg      if str msg      Server going down           pass   or whatever you want to do when the server goes down     else            appropriate handling logging of other runtime errors   and so on       No need to send yourself a request

User · Answer

A Python solution Run with   python kill server py  This is for Windows only   Kills the servers with taskkill  by PID  gathered with netstat    kill server py  import os import subprocess import re  port   5000 host    127 0 0 1  cmd newlines   r  r n   host port   host         str port  pid regex   re compile r  0-9       netstat   subprocess run   netstat    -n    -a    -o    stdout subprocess PIPE      Doesn t return correct PID info without precisely these flags netstat   str netstat  lines   netstat split cmd newlines   for line in lines      if host port in line          pid   pid regex findall line          if pid              pid   pid 0              os system  taskkill  F  PID     str pid              And finally delete the  pyc cache os system  del  S   pyc    If you are having trouble with favicon   changes to index html loading  i e  old versions are cached   then try  quot Clear Browsing Data  gt  Images  amp  Files quot  in Chrome as well  Doing all the above  and I got my favicon to finally load upon running my Flask app

[python] How to stop flask application without using ctrl-c

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