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Subject: Python stdout goes where under systemd? (Was: Example of python service running under systemd?)
From: Travis Griggs <travisgriggs@gmail.com>
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Xref: csiph.com comp.lang.python:77819

Thanks all for the help/advice. I=92m getting there.

To experiment/learn, I made a simple python program (/Foo/cyclic.py):
=20
    #!/usr/bin/env python3

    import time

    while True:
        time.sleep(5)=09
        with open('sound', 'r') as file:
            currentValue =3D file.read()
        otherValue =3D 'tick' if currentValue =3D=3D 'tock' else 'tock'
        with open('sound', 'w') as file:
            file.write(otherValue)
        print(currentValue, '->', otherValue)

Run from the command line, this tick-tocks nicely, both outputting, as =
well as updating the =91/Foo/sound=92 file on a 5 second period.

I then created a simple .service file:

    [Unit]
    Description=3DFoo for learning service
    After=3Dnetwork-online.target
   =20
    [Service]
    Type=3Dsimple
    ExecStart=3D/Foo/cyclic.py
    WorkingDirectory=3D/Foo
    StandardOutput=3Djournal
   =20
    [Install]
    WantedBy=3Dmulti-user.target

I chose to be =93explicit=94 with some of the default options (Type and =
StandardOutput).
I finally executed:

    systemctl --system daemon-reload
    systemctl enable foo
    systemctl start foo

It seems to work. Almost. The file is being updated regularly (watch cat =
/Foo/sound shows the change happening). But I can=92t seem to find the =
output from my print() statement. journalctl -f doesn=92t show anything. =
Nor does tail -f /var/log/syslog or any of the others. It just seems to =
be going nowhere? Is there something I need to do special to get the =
print() output going somewhere logable?