Systemd Execstart

Question

I have a Python script which I want to run as a daemon. I am doing that by creating a unit file /etc/systemd/system/service

and I want to run it as systemctl start/stop/restart myservice

and depending on this start stop arguments I am handling system signals like SIGUP,SIGINT

Problem is i can run my script as Python main.py start/stop/restart and my logic works.

But after converting into a unit file this python file is invoked by ExecStart and I don't know how to pass arguments there?

    [Unit] 
    Description=This service monitors docker daemon for events
    After=multi-user.target

    [Service]
    Type=simple
    ExecStart=/home/PycharmProjects/python_tests/service-discovery/utils/auto_registeration_script/main.py
    User=root
    WorkingDirectory=/home/PycharmProjects/python_tests/service-discovery/utils/auto_registeration_script/
    Restart=on-failure

    [Install]
    WantedBy=multi-user.target

What kind of arguments are you trying to pass? you could just append them to the ExecStart line if you know them beforehand, or use environment vars as another way of configuring the service — omu_negru
– omu_negru, Commented Aug 17, 2017 at 17:22
I wanna take start/stop/restart from CMD of systemctl and pass it to execstart as arguement to my python script so that my script can run based on the arguement came in — Ravindra Singh
– Ravindra Singh, Commented Aug 17, 2017 at 20:47
Can you please give me an example of how to do this @omu_negru — Ravindra Singh
– Ravindra Singh, Commented Aug 17, 2017 at 20:48

Guido U. Draheim · Accepted Answer · 2017-09-10 12:36:38Z

0

Isn't it that you are actually running "main.py start" and "main.py stop"? In that case you have programmed a "forking" service.

[Unit] 
Description=This service monitors docker daemon for events
After=multi-user.target

[Service]
Type=forking
Environment=script=/home/PycharmProjects/python_tests/service-discovery/utils/auto_registeration_script/main.py
ExecStart=$script start
ExecStop=$script stop
User=root
WorkingDirectory=/home/PycharmProjects/python_tests/service-discovery/utils/auto_registeration_script/
Restart=on-failure

[Install]
WantedBy=multi-user.target

answered Sep 10, 2017 at 12:36

Guido U. Draheim

3,2861 gold badge23 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Systemd Execstart

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related