Difference between revisions of "Flask"
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===Super simple apps=== | ===Super simple apps=== | ||
− | In /var/www/flask/app1/app1 | + | In /var/www/flask/app1/app1.py |
<syntaxhighlight lang=python> | <syntaxhighlight lang=python> | ||
#!/usr/bin/env python3 | #!/usr/bin/env python3 |
Revision as of 20:09, 14 July 2021
Basics
Check this[1]
Hello world app:
#!/usr/bin/env python3
from flask import Flask
print(__name__)
app = Flask(__name__)
@app.route('/')
def welcome():
return 'Welcome'
if __name__ == '__main__': # When executed on the commandline (build in webserver)
app.run(host='0.0.0.0',port=5000) # Listen to localhost port 5000, you can also use flask run for options
#app.run(host='0.0.0.0',port=8080,Debug=True) # Run in debug mode, listen to all hosts on port 8080
Run the build-in server listening to all
export FLASK_APP=welcome_app.py
flask run --host=0.0.0.0
welcome_app * Serving Flask app "welcome_app" * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
Now you can browse to <serverIP>:5000
Integrate with nginx
Mayor part is from this site [2].
- Install uwsgi it's python plugin.
- Create a virtual webserver (port 80 is save enough if you have a secure front-end server)
server {
listen 80 ;
listen [::]:80;
root /var/www/flask;
server_name <fqdn>;
location /app1 {
include uwsgi_params;
uwsgi_param SCRIPT_NAME /app1;
uwsgi_modifier1 30;
uwsgi_pass unix://tmp/app1.sock;
}
}
Generate web pages
https://flask.palletsprojects.com/en/1.1.x/patterns/templateinheritance/#template-inheritance
Put a index.html in <app-base>/templates/
#!/usr/bin/env python3
from flask import Flask, render_template
print(__name__)
app = Flask(__name__)
@app.route('/html')
def static_page():
return render_template('index.html')
if __name__ == '__main__':
app.run(host='0.0.0.0',port=5000,debug=True)
Microservices and/or more applications on 1 web-server
Starting with this page and additional a lot more we got it working on raspberry pi debian.
- Make python3 the default
cd /usr/bin;rm python;ln -s python3 python
- Install uwsgi and python plugin
apt install uwsgi uwsgi-plugin-python3
- install nginx
apt install nginx-full
I had to make a small change in the nginx configuration;
vi /etc/nginx/conf.d/my.conf
server_names_hash_bucket_size 64;
Super simple apps
In /var/www/flask/app1/app1.py
#!/usr/bin/env python3
from flask import Flask
import os
application = Flask(__name__)
@application.route('/app1')
def app1():
return "App 1 live and kicking"
if __name__ == '__main__':
application.run(host='0.0.0.0', port=8080,debug=True)
/var/www/flask/app2/app2.py
#!/usr/bin/env python3
from flask import Flask
import os
application = Flask(__name__)
@application.route('/app2')
def app2():
return "App 2 live and kicking"
if __name__ == '__main__':
application.run(host='0.0.0.0', port=8080,debug=True)
Create a nginx virtual host
/etc/nginx/sites-enabled/apps.conf
server {
listen 80;
server_name <your webserver fdqn>;
index index.html;
root /var/www/flask;
location /app1 {
include uwsgi_params;
uwsgi_param SCRIPT_NAME /app1;
uwsgi_modifier1 30;
uwsgi_pass unix://tmp/app1.sock;
}
location /app2 {
include uwsgi_params;
uwsgi_param SCRIPT_NAME /app2;
uwsgi_modifier1 30;
uwsgi_pass unix://tmp/app2.sock;
}
}
Start things
service uwsgi start
service nginx start
That's it. Point your webbrowser to http://<your webserver fdqn>/app1
Optimization still to be done. I think I start on this place