How to deploy fastAPI app with postgreSQL database in AWS EC2

Shaikh Al Amin - Nov 7 - - Dev Community

SSH into your AWS cli

System update and install Postgres, Nginx, python3 pip, and venv 

sudo apt update
sudo apt upgrade
sudo apt install curl ca-certificates
sudo install -d /usr/share/postgresql-common/pgdg
sudo curl -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.asc --fail https://www.postgresql.org/media/keys/ACCC4CF8.asc
sudo install -d /usr/share/postgresql-common/pgdg
sudo sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc] https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
sudo apt install postgresql-14 postgresql-client-14
sudo apt install python3-pip python3-venv 
sudo apt install nginx
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Complete Postgres setup and create a database 

sudo -i -u postgres
psql -U postgres -h localhost

postgres@shaikh:~$ psql
postgres=# create database local_test;
CREATE DATABASE
postgres=# grant all privileges on database local_test to postgres;
GRANT
postgres=# ALTER USER postgres WITH PASSWORD 'postgres';
ALTER ROLE
postgres=# exit()
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Generate ssh profile to pull the project from github 

cd ~/.ssh/
ssh-keygen -t ed25519 -C "amin@test.com"
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Copy the public key and put inside your github setting SSH keys with a valid name 

cat id_ed25519.pub
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Create a folder for git projects and clone the repo 

cd ~/
mkdir projects
cd projects/
git clone git@github.com:shaikhalamin/backend-project.git
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Create a virtual environment and activate the venv 

python3.10 -m venv venv
source venv/bin/activate
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Now CD into the project directory and install the requirements along with Gunicorn server 

cd backend-project/
pip install -r requirements.txt
pip install gunicorn
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Setup your .env and modify accordingly 

cp .env.example .env
nano .env
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Test the server run using unicorn 

uvicorn main:app --host 0.0.0.0 --port 8000
cat .env
nano configs/setting.py 
uvicorn main:app --host 0.0.0.0 --port 8000
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Now Setup gunicorn service for running your application as a service

Get the Gunicorn installed path and project path by the below command 

which gunicorn
pwd
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Create below service file and put the below following content in there 

sudo nano /etc/systemd/system/devapi_gunicorn.service
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[Unit]
Description=Gunicorn instance to serve fast API application
After=network.target

[Service]
User=ubuntu
Group=ubuntu
WorkingDirectory=/home/ubuntu/backend-project/
ExecStart=/home/ubuntu/venv/bin/gunicorn -w 4 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8080 main:app

[Install]
WantedBy=multi-user.target
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Now enable Gunicorn service 

sudo systemctl enable devapi_gunicorn
sudo systemctl start devapi_gunicorn
sudo systemctl status devapi_gunicorn
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Now create an nginx config file and change it according to your domain name 

cd /etc/nginx/sites-available/
sudo nano orangedev.com
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   server {

    server_name orangedev.com;

    location / {
        proxy_pass http://localhost:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

  }
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Move the nginx config file to the sites-enabled 

sudo ln -s /etc/nginx/sites-available/orangedev.com /etc/nginx/sites-enabled/
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Check the Nginx config and reload the Nginx 

sudo nginx -t
sudo systemctl reload nginx
sudo systemctl restart nginx
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Allow fire all for SSH, HTTP, and HTTPS only 

sudo ufw status
sudo ufw allow ssh
sudo ufw allow http
sudo ufw allow https
# For posgres from another server
sudo ufw allow 5432/tcp
sudo ufw enable
sudo ufw status
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If everything goes well install certbot for SSL certificated 

sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
[N:B]
# Setup domain name and point to the correct IP and check from DNS checker then run the below command
sudo certbot --nginx
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