first version

.env

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+MYSQL_ROOT_PASSWORD=password
+MYSQL_DATABASE=testdb
+MYSQL_USER=testuser
+MYSQL_PASSWORD=password

data.csv

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+name,age
+Alice,30
+Bob,25
+Charlie,35

docker-compose.yml

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+version: "3.8"
+
+services:
+  db:
+    image: mariadb
+    environment:
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
+      MYSQL_DATABASE: ${MYSQL_DATABASE}
+      MYSQL_USER: ${MYSQL_USER}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
+    networks:
+      - mynetwork
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "--silent"]
+      interval: 10s
+      retries: 5
+
+  filler:
+    build: ./filler
+    depends_on:
+      db:
+        condition: service_healthy
+    volumes:
+      - ./data.csv:/app/data.csv
+    networks:
+      - mynetwork
+
+  web:
+    build: ./web
+    ports:
+      - "8000:8000"
+    depends_on:
+      - db
+      - filler
+    networks:
+      - mynetwork
+
+networks:
+  mynetwork:
+    driver: bridge

filler/Dockerfile

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+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY fill_db.py ./
+
+ENTRYPOINT ["python", "fill_db.py"]

filler/filler_db.py

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+import os
+import time
+import pymysql
+import csv
+
+db_config = {
+    'host': 'db',
+    'user': os.getenv('MYSQL_USER'),
+    'password': os.getenv('MYSQL_PASSWORD'),
+    'db': os.getenv('MYSQL_DATABASE'),
+}
+
+while True:
+    print("Try connect to db")
+    try:
+        connection = pymysql.connect(**db_config)
+        break
+    except pymysql.MySQLError:
+        time.sleep(3)
+
+print("")
+
+with connection.cursor() as cursor, open('data.csv', 'r') as csv_file:
+    reader = csv.DictReader(csv_file)
+    for row in reader:
+        cursor.execute("INSERT INTO data (name, age) VALUES (%s, %s)", (row['name'], row['age']))
+    connection.commit()
+
+with connection.cursor() as cursor:
+    cursor.execute("SELECT * FROM data")
+    for row in cursor.fetchall():
+        print(row)

web/Dockerfile

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+# ./web/Dockerfile
+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py ./
+
+CMD ["flask", "run", "--host=0.0.0.0", "--port=8000"]

web/app.py

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+from flask import Flask, jsonify
+import pymysql
+import os
+
+app = Flask(__name__)
+
+def get_db_connection():
+    return pymysql.connect(
+        host='db',
+        user=os.getenv('MYSQL_USER'),
+        password=os.getenv('MYSQL_PASSWORD'),
+        db=os.getenv('MYSQL_DATABASE')
+    )
+
+@app.route('/')
+def index():
+    conn = get_db_connection()
+    with conn.cursor() as cursor:
+        cursor.execute("SELECT name, age FROM data")
+        result = cursor.fetchall()
+    return jsonify(result)
+
+@app.route('/health')
+def health():
+    return jsonify({"status": "OK"})
+
+@app.errorhandler(404)
+def not_found(e):
+    return jsonify({"error": "Not found"}), 404

web/requirements.txt

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+flask
+pymysql