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How to create a Server for a Flask application on DigitalOcean Droplet

git clone your repo from github

   git clone [webapp github url]

set a virtualenv for this app:

   virtualenv -p python3 myenv

create a file wsgi.py in your flask app root folder with the following lines

from app import app

if __name__ == "__main__":
    app.run()

remove debug mode from app.py:

if __name__ == "__main__":
    app.run()

run python wsgi.py to check the configuration

python wsgi.py

Dump your db from your previous server ( PostgreSQL )

pg_dump -d database_name -U username -h hostname  > filename.dump

deactivate the virtualenv

deactivate

create a service with the file : /etc/systemd/system/projectname.service


[Unit]
Description=Gunicorn instance to serve myproject
After=network.target

[Service]
User=username
Group=www-data
WorkingDirectory=/home/username/myproject
Environment="PATH=/home/maru/myproject/myenv/bin"
ExecStart=/home/maru/myproject/myenv/bin/gunicorn --workers 4 --bind unix:myproject.sock -m 007 wsgi:app

[Install]
WantedBy=multi-user.target

Start myproject

sudo systemctl start myproject

Enable myproject

sudo systemctl enable myproject

You will see something like this:

Created symlink /etc/systemd/system/multi-user.target.wants/myproject.service → /etc/systemd/system/myproject.service.

check status:

sudo systemctl status myproject

Create the file /etc/nginx/sites-available/myproject

server {
    listen 80;
    server_name myproject.com www.myproject.com;
     location / {
        include proxy_params;
        proxy_pass http://unix:/home/username/myproject/myproject.sock;
        }
}

Create a link like this:

sudo ln -s /etc/nginx/sites-available/myproject /etc/nginx/sites-enabled

check nginx with:

sudo nginx -t

If everything is OK the output looks like this:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

restart nginx with:

sudo systemctl restart nginx

Create a new subdomain in digitalocean droplet
Create directory:

sudo mkdir -p /var/www/example.com/html

Set permissons for that:

sudo chown -R $USER:$USER /var/www/example.com/html

permission for the whole directory:

sudo chmod -R 755 /var/www

Create the DB on your new local server
If DB exists => dump and restore.

Else => in the terminal run python and after import your app and run code:

$ python

>>>from app import db
>>>db.create_all()