SimpleDockerProjectRH.py

import subprocess
import os

def run_command(command, cwd=None):
    print(f"\n🔹 Executing: {command}")
    subprocess.run(command, shell=True, check=True, cwd=cwd)

def write_file(filename, content):
    with open(filename, "w") as f:
        f.write(content)
    print(f"✅ Created: {filename}")

def main():
    # 🔹 System Preparation
    run_command("sudo dnf update -y")
    run_command("sudo dnf install -y yum-utils curl")

    # 🔹 Install Docker Engine
    run_command("sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo")
    run_command("sudo dnf install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin")
    run_command("sudo systemctl enable --now docker")
    run_command("sudo systemctl status docker")
    run_command("docker --version")

    # 🔹 Docker Compose Plugin
    run_command("docker compose version")

    # 🔹 Optional: Install legacy docker-compose binary
    run_command('sudo curl -L "https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose')
    run_command("sudo chmod +x /usr/local/bin/docker-compose")
    run_command("docker-compose --version")

    # 🔹 Install Python and Pip
    run_command("sudo dnf install -y python3 python3-pip")
    run_command("python3 -m pip install --upgrade pip")

    # 🔹 Create Project Directory
    os.makedirs("docker-projects", exist_ok=True)
    os.chdir("docker-projects")

    # 🔹 Create Python Web App
    write_file("app.py", """from flask import Flask
import redis

app = Flask(__name__)
cache = redis.Redis(host='redis', port=6379)

def get_hit_count():
    try:
        return cache.incr('hits')
    except redis.exceptions.ConnectionError:
        return 1

@app.route('/')
def hello():
    count = get_hit_count()
    return f"Hello World! You have visited {count} times."

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)
""")

    # 🔹 Define Dependencies
    write_file("requirements.txt", "Flask\nredis\n")

    # 🔹 Create Dockerfile
    write_file("Dockerfile", """FROM python:3.9

WORKDIR /app
COPY . .
RUN pip install -r requirements.txt
CMD ["python", "app.py"]
""")

    # 🔹 Configure Docker Compose
    write_file("docker-compose.yml", """version: '3'

services:
  web:
    build: .
    ports:
      - "5000:5000"
    depends_on:
      - redis

  redis:
    image: "redis:alpine"
""")

    # 🔹 Build and Run the Project
    run_command("docker compose up --build")

if __name__ == "__main__":
    main()