General
I recently wrote myself a flaskapp using python. The content is not so important, but I would like to run the thing permanently. Preferably controlled by the operating system. So I can then, for example with a reverse proxy like nginx, access the service and do not have to worry after a restart that I forget something.
So how do I bind my Flaskapp with systemd? I simply create my own unit under /etc/systemd/system with the following content:
vi /etc/systemd/system/flaskapp.service
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[Unit]
Description=My Flask App
After=network.target
[Service]
User=<username>
WorkingDirectory=<path to your app directory>
ExecStart=<app start command>
Restart=always
[Install]
WantedBy=multi-user.target
Now I still need to add the new service. I can do this via reboot of the system or simply via systemctl daemon-reload. This will refresh the systemd configuration and the new service will be recognized.
To make the autostart of the service work, I have to issue the following commands:
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# This will enable the start on boot and start the service directly
systemctl enable --now flaskapp.service
Of course, you can also do this separately:
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systemctl enable flaskapp.service
systemctl start flaskapp.service