demo for compose

src/Dockerfile

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+FROM python:3.12
+
+WORKDIR /app
+
+COPY main.py .
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+CMD ["python3", "main.py"]

src/main.py

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+import os
+
+import psycopg2
+from flask import Flask
+
+# Подключение к базе данных postgres
+
+conn = psycopg2.connect(
+    dbname=os.getenv("POSTGRES_DB"),
+    user=os.getenv("POSTGRES_USER"),
+    password=os.getenv("POSTGRES_PASSWORD"),
+    host="db",
+    port="5432"
+)
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello_world():
+    return """<p>Hello, World!</p><br><a href="/db">ТЫК</a>"""
+
+
+@app.route("/db")
+def db():
+    cur = conn.cursor()
+    cur.execute('''UPDATE mytable SET visitors_count = visitors_count + 1''')
+    conn.commit()
+    cur.execute("SELECT visitors_count from mytable")
+    result = cur.fetchone()
+    value = -1
+    if result:
+        value = result[0]
+    return f"""DB:{value}<br><a href="/">Обратно</a>"""
+
+
+if __name__ == "__main__":
+    cur = conn.cursor()
+    cur.execute('''CREATE TABLE IF NOT EXISTS mytable (
+    id SERIAL PRIMARY KEY,
+    visitors_count INTEGER NOT NULL DEFAULT 0)''')
+
+    cur.execute('''INSERT INTO mytable (id, visitors_count)
+    VALUES (1, 0)
+    ON CONFLICT (id) DO NOTHING''')
+    conn.commit()
+
+    app.run(host="0.0.0.0", port=8086)