Flask

Python3

apt install python3.8
pip3 install virtualenv
cd /var/www/flask/RestApi/RestApi/

virtualenv venv
source venv/bin/activate
pip install Flask
deactivate

Flask

mkdir -p /var/www/flask/RestApi/RestApi/{static,templates}
cat > /var/www/flask/RestApi/RestApi/__init__.py << EOF
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
    return "Hello, Bangladesh!"
if __name__ == "__main__":
    app.run()
EOF

WSGI3

cd /var/www/flask/RestApi/
cat > /var/www/flask/RestApi/RestApi.wsgi << EOF
#!/usr/bin/python
activate_this = '/var/www/flask/RestApi/RestApi/venv/bin/activate_this.py'
with open(activate_this) as file_:
    exec(file_.read(), dict(__file__=activate_this))

import sys
import logging
logging.basicConfig(stream=sys.stderr)
sys.path.insert(0,"/var/www/flask/RestApi/")

from RestApi import app as application
application.secret_key = 'Add your secret key'
EOF

Apache3

WSGI3

apt install apache2
systemctl restart apache2
apt install libapache2-mod-wsgi python-dev
a2enmod wsgi

a2dismod wsgi
apt remove libapache2-mod-wsgi python-dev
apt install libapache2-mod-wsgi-py3 python3-dev

a2enmod wsgi
apache2ctl -t
systemctl enable apache2
systemctl restart apache2

SITE

vim /etc/apache2/sites-available/000-default.conf

WSGIScriptAlias /rest "/var/www/flask/RestApi/RestApi.wsgi"
<Directory "/var/www/flask/RestApi/RestApi">
    Order Allow,Deny
    Allow from all
</Directory>

Alias /rest/static "/var/www/flask/RestApi/RestApi/static/"
<Directory "/var/www/flask/RestApi/RestApi/static">
    Order Allow,Deny
    Allow from all
</Directory>

References

• Python3 Flask config by using Apache2 Mod_WSGI on Ubuntu
• Deploy a Flask Application on Ubuntu