CODEWITHSUNDEEP
pythonflasksystemd
Maugrim
Maugrim

Reputation: 126

Systemd launches duplicate python processes

I am using systemd to start a python flask app on raspberry pi zero(Raspbian buster).

Every time I start a service, it launches two python processes instead of one. Why does this happen?

enter image description here

The first process is the parent of the second process.

enter image description here

Here is my service definition in /etc/systemd/system/website.service:

[Unit]
Description=Website
After=network.target

[Service]
User=root
WorkingDirectory=/home/pi/dev
ExecStart=python /home/pi/dev/app.py
Restart=always

[Install]
WantedBy=multi-user.target

Here is the flask app in /home/pi/dev/app.py

from flask import Flask
app = Flask(__name__)


@app.route('/')
def hello():
    return "Hello World!"

if __name__ == '__main__':
    app.run(host='0.0.0.0', debug=True)

Upvotes: 0

Views: 648

Answers (1)

Maugrim
Maugrim

Reputation: 126

I found the answer, Flask's dev server is running with the reloader so it's launching two processes. If I add use_reloader=False when starting the Flask app, it will only start one process.

app.run(host='0.0.0.0', debug=True, use_reloader=False)

More info here: Why does a Flask app create two process?

Upvotes: 3

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