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Deploy A Django Application on Ubuntu 20.04 and Postgres

Step 1 — Installing Packages from the Ubuntu Repositories

sudo apt update

sudo apt install python3-pip python3-dev libpq-dev postgresql postgresql-contrib nginx curl

Install Postgres

sudo apt install postgresql postgresql-contrib

More on this here

Creating users

sudo -u postgres psql
create database dbname;
create user myuser with encrypted password 'password';
grant all privileges on database mydb to myuser;

Quit the console

\q

more on this here

Creating a virtual environment

sudo -H pip3 install --upgrade pip
sudo -H pip3 install virtualenv

Create project folder

cd /var/www

Clone your project from source control git clone https://giturl cd project_folder
Add Virtual Environment

virtualenv venv
source venv/bin/activate

Install Required packages

pip install -r requirements.txt

Set credentials in settings.py

Make migrations 

python manage.py makemigrations
python manage.py migrate
 ```

Create admin user
python manage.py createsuperuser

Collect static files
python manage.py collectstatic

Test that the project runs correctly
sudo ufw allow 8000 python manage.py runserver 0.0.0.0:8000 
Visit your server's ip address:8000

Install and configure gunicorn
pip install gunicorn 
In the event where you face a permission issue while installing a package,
sudo chown -R 
Make sure to replace currentuser with your username and virtualenvdir with your correct virtual environment directory

## Create a socket to listen to connection and manage application boot
sudo nano /etc/systemd/system/gunicorn.socket 
Add the following content
[Unit] Description=gunicorn daemon Requires=gunicorn.socket After=network.target 
## Create a systemd service file
sudo nano /etc/systemd/system/gunicorn.service

Add the following content
[Unit] Description=gunicorn daemon Requires=gunicorn.socket After=network.target

[Service] User=currentuser Group=www-data WorkingDirectory=/home/sammy/myprojectdir ExecStart=/home/sammy/myprojectdir/myprojectenv/bin/gunicorn \ --access-logfile - \ --workers 3 \ --bind unix:/run/gunicorn.sock \ myproject.wsgi:application

[Install] WantedBy=multi-user.target 

Grant your user account access to the service
sudo chown /etc/systemd/system/gunicorn_rde.service 
Add your user to the www-data group
usermod -a -G www-data administrator 
Add folder to www-data group
chgrp www-data /var/www/ chmod g+rwxs /var/www/ 
> The first command changes the group ownership of the folder to that of
> the webserver. The second command gives members of the  `www-data`
> group read, write, enter-directory rights, and the group  `s`  flag
> will ensure that any files that get created inside that directory take
> `www-data`  as the group - so if you create a file as  `myuser`  the
> `www-data`  user will have access.



[Learn more here](https://askubuntu.com/questions/244406/how-do-i-give-www-data-user-to-a-folder-in-my-home-folder)

## Start the socket
sudo systemctl start gunicorn.socket 
Enable the socket so that when a connection is made to it, it will start the gunicorn.service

    sudo systemctl enable gunicorn.socket

Confirm that the socket started successfully by running
sudo systemctl status gunicorn.socket 
Confirm that the socket file exists within the run dir

    file /run/gunicorn.sock

If you need to make any changes to your .service files, ensure to reload the edits with
systemctl daemon-reload 
## Configuring Nginx
nano /etc/nginx/sites-available/projectname
server { listen 80; server_name 196.41.38.246;

location = /favicon.ico { access_log off; log_not_found off; }
location /static/ {
    root /var/www/eac_rde_backend;
}

location / {
    include proxy_params;
    proxy_pass http://unix:/run/gunicorn_rde.sock;
}

} Create a symbolic link to the sites-enabled dir sudo ln -s /etc/nginx/sites-available/projectname /etc/nginx/sites-enabled Test your Nginx configuration for syntax errors: sudo nginx -t If no errors are reported, go ahead and restart Nginx: sudo service nginx restart Delete the 8000 rule in the firewall settings since we no longer need it sudo ufw delete allow 8000 Allow traffic via the 80 and 443 ports: sudo ufw allow 'Nginx Full' ```

Sam