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app.py

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+from flask import Flask
+import psycopg2
+
+app = Flask(__name__)
+
+# Database connection details
+DB_USER = 'user'
+DB_PASSWORD = 'password'
+DB_NAME = 'mydatabase'
+DB_HOST = 'db'
+DB_PORT = '5432'
+
+@app.route('/')
+def index():
+    # Connect to PostgreSQL database
+    conn = psycopg2.connect(
+        database=DB_NAME,
+        user=DB_USER,
+        password=DB_PASSWORD,
+        host=DB_HOST,
+        port=DB_PORT
+    )
+    
+    cursor = conn.cursor()
+    cursor.execute("SELECT version();")
+    db_version = cursor.fetchone()
+
+    return f"PostgreSQL database version: {db_version}"
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=8000)

docker-compose.yml

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+version: '3.8'
+
+services:
+  # Flask application service
+  app:
+    image: my-flask-app  # Use the image built for your Flask app
+    build:
+      context: .  # Build from Dockerfile in current directory
+    ports:
+      - "8000:8000"  # Map host port 7860 to container port 7860
+    depends_on:
+      - db  # Ensure the db service is started before the app
+    environment:
+      - FLASK_ENV=development
+      - DATABASE_URL=postgresql://user:password@db:5432/mydatabase  # Connection URL for PostgreSQL
+    networks:
+      - my_network  # Connect to the custom network
+
+  # PostgreSQL database service
+  db:
+    image: postgres:13  # Use the official PostgreSQL image
+    environment:
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: mydatabase
+    ports:
+      - "5432:5432"  # Map host port 5432 to container port 5432
+    networks:
+      - my_network  # Connect to the custom network
+
+networks:
+  my_network:
+    driver: bridge

dockerfile

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+# FROM postgres:15
+# # Update package list and install Python 3, Pip, and any required packages
+# FROM ubuntu:20.04
+
+# # Update package list and install Python 3, Pip, and required packages
+# RUN apt-get update && apt-get install -y python3 python3-pip python3-venv
+
+# # Install dependencies for PostgreSQL or Python packages
+# RUN apt-get install -y libpq-dev gcc
+
+# # Create and activate a virtual environment
+# WORKDIR /app
+# RUN python3 -m venv venv
+# ENV PATH="/app/venv/bin:$PATH"
+
+# # Copy application files
+# COPY . /app
+# ENV DEBIAN_FRONTEND=noninteractive
+
+
+# # Install Python dependencies inside the virtual environment
+# RUN pip install --upgrade pip
+# RUN pip install -r requirements.txt
+# # Install required packages for PostgreSQL
+# RUN apt-get update && apt-get install -y \
+#     postgresql \
+#     postgresql-contrib \
+#     && rm -rf /var/lib/apt/lists/*
+
+# # Set environment variables for PostgreSQL
+# ENV POSTGRES_USER="admin"
+# ENV POSTGRES_PASSWORD="admin"
+# ENV POSTGRES_DB="admin"
+
+# # Expose the PostgreSQL port
+# EXPOSE 5432
+
+# # Install any necessary dependencies
+# # RUN pip install -r requirements.txt
+# # Initialize PostgreSQL database and start the service
+# # Initialize PostgreSQL database and start the service
+
+
+# # Set environment variables for database name, username, and password
+
+
+# # Optional: If you want to initialize the database with a script
+# COPY init.sql /docker-entrypoint-initdb.d/
+
+# # Expose PostgreSQL default port
+# EXPOSE 5432
+# EXPOSE 7860
+
+
+
+# # Command to run the application along with PostgreSQL
+# CMD service postgresql start 
+# ENTRYPOINT ["python3", "app.py"]
+
+
+# Use the official Python image as a base image
+FROM python:3.8-slim
+
+# Set environment variables
+ENV FLASK_APP=app.py
+ENV FLASK_RUN_HOST=0.0.0.0
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the requirements file into the container
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application code into the container
+COPY . .
+
+# Expose the port the app runs on
+EXPOSE 7860
+
+# Start the Flask application
+CMD ["flask", "run"]

init.sql

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+CREATE DATABASE mydatabase;
+CREATE USER myuser WITH ENCRYPTED PASSWORD 'admin';
+GRANT ALL PRIVILEGES ON DATABASE "admin" TO "admin";

pg_hba.conf

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+# TYPE  DATABASE        USER            ADDRESS                 METHOD
+host    all             all             0.0.0.0/0               md5

requirements.txt

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+Flask # Or any other framework you are using
+psycopg2-binary  # PostgreSQL adapter for Python