Building Data-Driven Web Apps with Flask and SQLAlchemy Transcripts
Chapter: Deployment
Lecture: Concept: uWSGI
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Let's quickly look at what we had to do
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to get our code running under uWSGI.
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Basically, what we had to do is come up with this command
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that would just launch uWSGI.
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So this exec start command here
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notice that's actually one line that's wrapping around.
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It's basically the two lines there are one individual line
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in a file. So, we're going to go and run the uWSGI
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out of our virtual environment.
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We're going to say the home is the virtual environment
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so it knows to use that for Python.
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Master mode, we want four processes, two threads.
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I suspect we could have actually
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a lot more threads per process.
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Listen on HTTP port 5000.
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Set the Python path to where our project is.
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And then we created the wsgi.py file
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it just imported the app
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and we're going to mount /
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go into the wsgi module, get the app variable out
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and that's what Flask is going to use here.
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And that's it. It's off to the races, it works great.
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Also set the runtime directory.
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I think the final / there is super important.
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I think if you omit it it reports it as an error.
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So we just set this up and this is a systemd unit file
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and it just runs this command and keeps it running
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if there were some reason it crashes.
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That's all we got to do
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to make sure that our app runs under uWSGI.
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But remember, it's best to take that exec start command
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run it separately, make sure it works
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and then come back
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and try to set it up as this daemon process here.