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Dockerfile

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+FROM python:3.9
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+COPY . .
+CMD ["python", "app.py"]
+

app.py

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+from flask import Flask, render_template, request, jsonify
+import psycopg2
+import os
+
+app = Flask(__name__, template_folder="templates", static_folder="static")
+
+# Подключение к БД
+def get_db_connection():
+    conn = psycopg2.connect(
+        host="db",
+        database="mydatabase",
+        user="postgres",
+        password=os.getenv("POSTGRES_PASSWORD", "mysecretpassword")
+    )
+    return conn
+
+# Главная страница с HTML
+@app.route("/")
+def home():
+    conn = get_db_connection()
+    cur = conn.cursor()
+    cur.execute("SELECT id, name FROM users;")
+    users = cur.fetchall()
+    cur.close()
+    conn.close()
+    return render_template("index.html", users=users)
+
+# API для добавления пользователя
+@app.route("/add_user", methods=["POST"])
+def add_user():
+    name = request.form.get("name")
+    if name:
+        conn = get_db_connection()
+        cur = conn.cursor()
+        cur.execute("INSERT INTO users (name) VALUES (%s) RETURNING id;", (name,))
+        user_id = cur.fetchone()[0]
+        conn.commit()
+        cur.close()
+        conn.close()
+        return jsonify({"id": user_id, "name": name}), 201
+    return jsonify({"error": "Имя не может быть пустым"}), 400
+
+# API для удаления пользователя
+@app.route("/delete_user/<int:user_id>", methods=["POST"])
+def delete_user(user_id):
+    conn = get_db_connection()
+    cur = conn.cursor()
+    cur.execute("DELETE FROM users WHERE id = %s RETURNING id;", (user_id,))
+    deleted = cur.fetchone()
+    conn.commit()
+    cur.close()
+    conn.close()
+    if deleted:
+        return jsonify({"message": "Пользователь удален"})
+    return jsonify({"error": "Пользователь не найден"}), 404
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000, debug=True)

docker-compose.yml

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+version: "3.8"
+
+services:
+  web:
+    build: .
+    ports:
+      - "5000:5000"
+    depends_on:
+      - db
+    environment:
+      - POSTGRES_PASSWORD=mysecretpassword
+
+  db:
+    image: postgres:13
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_PASSWORD=mysecretpassword
+      - POSTGRES_DB=mydatabase
+
+  pgadmin:
+    image: dpage/pgadmin4
+    ports:
+      - "8080:80"
+    environment:
+      - PGADMIN_DEFAULT_EMAIL=user@domain.com
+      - PGADMIN_DEFAULT_PASSWORD=SuperSecret
+    depends_on:
+      - db
+
+volumes:
+  pgdata:
+

prepare-app.sh

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+#!/bin/bash
+set -e
+
+echo "Vytvárame virtuálnu sieť..."
+docker network create app_network || true
+
+echo "Vytvárame volume pre databázu..."
+docker volume create pgdata || true
+
+echo "Budujeme obrazy..."
+docker-compose build
+
+echo "Čakáme na spustenie databázy..."
+sleep 5  # Dávame PostgreSQL čas na spustenie
+
+echo "Vytvárame tabuľku 'users' v databáze..."
+docker-compose up -d db  # Spustíme iba databázový kontajner
+sleep 3  # Počkáme, kým sa PostgreSQL spustí
+
+docker exec $(docker-compose ps -q db) psql -U postgres -d mydatabase -c "
+CREATE TABLE IF NOT EXISTS users (
+    id SERIAL PRIMARY KEY,
+    name TEXT NOT NULL
+);"
+
+echo "Príprava dokončená!"

remove-app.sh

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+#!/bin/bash
+set -e
+
+echo "Odstraňujeme kontajnery..."
+docker-compose down -v
+
+echo "Odstraňujeme volume..."
+docker volume rm pgdata
+
+echo "Odstraňujeme virtuálnu sieť..."
+docker network rm app_network
+
+echo "Odstránenie dokončené!"

requirements.txt

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+flask
+psycopg2-binary
+

start-app.sh

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+#!/bin/bash
+set -e  # Zastaví vykonávanie pri chybe
+
+echo "Spúšťame aplikáciu..."
+
+# Určujeme, ktorý príkaz `docker compose` je dostupný
+if command -v docker-compose &> /dev/null; then
+    COMPOSE_CMD="docker-compose"
+elif command -v docker &> /dev/null && docker compose version &> /dev/null; then
+    COMPOSE_CMD="docker compose"
+else
+    echo "❌ Chyba: docker-compose alebo docker compose nie sú nainštalované!"
+    echo "Prosím, nainštalujte docker-compose:"
+    echo "sudo apt update && sudo apt install docker-compose-plugin -y"
+    exit 1
+fi
+
+# Spustenie kontajnerov
+$COMPOSE_CMD up -d
+
+# Výstup informácií
+echo "✅ Aplikácia bola úspešne spustená!"
+echo "🌍 Otvorte webovú aplikáciu: http://localhost:5000"
+echo "🗂 Otvorte pgAdmin: http://localhost:8080"

stop-app.sh

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+#!/bin/bash
+set -e
+
+echo "Zastavujeme kontajnery..."
+docker-compose down