How to make Python script run as service

Question

I want to run a python script in a CENTOS server     usr bin env python import socket try          import thread  except ImportError      import  thread as thread  Py3K changed it  class Polserv object       def   init   self           self numthreads   0         self tidcount     0         self port         843         self sock         socket socket socket AF INET  socket SOCK STREAM          self sock setsockopt socket SOL SOCKET  socket SO REUSEADDR  1          self sock bind   100 100 100 100   self port           self sock listen 5      def run self           while True              thread start new thread self handle  self sock accept         def handle self conn addr           self numthreads    1         self tidcount      1         tid self tidcount         while True              data conn recv 2048              if not data                  conn close                   self numthreads- 1                 break              if  quot  lt policy-file-request  gt  0 quot  in data              conn sendall b quot  lt  xml version  1 0   gt  lt cross-domain-policy gt  lt allow-access-from domain     to-ports      gt  lt  cross-domain-policy gt  quot               conn close               self numthreads- 1             break          conn sendall b quot    d   d running    s quot     tid self numthreads data    Polserv   run    Im using   python flashpolicyd py and it works fine    The question is  How to keep this script running even after I close the terminal console

User · Answer

for my script of python  I use     To START python script    start-stop-daemon --start --background --pidfile  PIDFILE --make-pidfile --exec  DAEMON   To STOP python script    PID   cat  PIDFILE  kill -9  PID rm -f  PIDFILE   P S   sorry for  poor English  I m from CHILE  D

User · Answer

My non pythonic approach would be using  amp  suffix  That is   python flashpolicyd py  amp    To stop the script  killall flashpolicyd py   also piping  amp  suffix with disown would put the process under superparent  upper    python flashpolicyd pi  amp  disown

User · Answer

I offer two recommendations   supervisord  1  Install the supervisor package  more verbose instructions here    sudo apt-get install supervisor   2  Create a config file for your daemon at  etc supervisor conf d flashpolicyd conf    program flashpolicyd  directory  path to project root environment ENV VARIABLE example OTHER ENV VARIABLE example2 command python flashpolicyd py autostart true autorestart true   3  Restart supervisor to load your new  conf  supervisorctl update supervisorctl restart flashpolicyd     systemd  if currently used by your Linux distro    Unit  Description My Python daemon   Service  Type simple ExecStart  usr bin python3  opt project main py WorkingDirectory  opt project  Environment API KEY 123456789 Environment API PASS password Restart always RestartSec 2   Install  WantedBy sysinit target   Place this file into  etc systemd system my daemon service and enable it using systemctl daemon-reload  amp  amp  systemctl enable my daemon  amp  amp  systemctl start my daemon --no-block   To view logs   systemctl status my daemon

User · Answer

first import os module in your app than with use from getpid function get pid s app and save in a file for example     import os pid   os getpid   op   open   var us pid   w   op write   s    pid  op close     and create a bash file in  etc init d path   etc init d servername  PATHAPP   etc bin userscript py  amp   PIDAPP   var us pid  case  1 in          start                  echo  starting                    python  PATHAPP                     stop                  echo  stoping                  PID   cat  PIDAPP                  kill  PID             esac   now   u can start and stop ur app with down command   service servername stop service servername start  or    etc init d servername stop  etc init d servername start

User · Answer

I use this code to daemonize my applications  It allows you start stop restart the script using the following commands   python myscript py start python myscript py stop python myscript py restart   In addition to this I also have an init d script for controlling my service  This allows you to automatically start the service when your operating system boots-up   Here is a simple example to get your going  Simply move your code inside a class  and call it from the run function inside MyDeamon   import sys import time  from daemon import Daemon   class YourCode object       def run self           while True              time sleep 1    class MyDaemon Daemon       def run self             Or simply merge your code with MyDaemon          your code   YourCode           your code run     if   name         main         daemon   MyDaemon   tmp daemon-example pid       if len sys argv     2          if  start     sys argv 1               daemon start           elif  stop     sys argv 1               daemon stop           elif  restart     sys argv 1               daemon restart           else              print  Unknown command              sys exit 2          sys exit 0      else          print  usage   s start stop restart    sys argv 0          sys exit 2    Upstart  If you are running an operating system that is using Upstart  e g  CentOS 6  - you can also use Upstart to manage the service  If you use Upstart you can keep your script as is  and simply add something like this under  etc init my-service conf  start on started sshd stop on runlevel   2345   exec  usr bin python  opt my service py respawn   You can then use start stop restart to manage your service   e g   start my-service stop my-service restart my-service   A more detailed example of working with upstart is available here   Systemd  If you are running an operating system that uses Systemd  e g  CentOS 7  you can take a look at the following Stackoverflow answer

[python] How to make Python script run as service?

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