Initial project structure

Dockerfile

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+FROM python:3-alpine
+RUN pip install --no-cache-dir --upgrade pip
+
+WORKDIR /app
+COPY src/ ./
+CMD [ "python", "ddns_update.py" ]

docker-compose.yml

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+version: "2"
+
+services:
+    strato-ddns:
+        container_name: strato-ddns
+        build: 
+            context: .
+        restart: always

src/ddns_update.py

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+#!/usr/bin/python3
+
+from time import sleep
+import logging
+
+logging.basicConfig(level=logging.DEBUG)
+log = logging.getLogger("ddns updater")
+
+if __name__ == "__main__":
+    log.info("starting...")
+    sequence = 1
+    while True:
+        log.debug(f"update sequence {sequence}")
+        sequence += 1
+        sleep(5)