Added folders as well...

swarm/stackredis/python-app-example/Dockerfile.yml

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+from pypy:3-6
+
+WORKDIR /usr/src/app
+
+# Bundle app source
+COPY app.py /usr/src/app
+COPY requirements.txt /usr/src/app
+
+RUN apt-get update
+
+RUN apt-get install -y vim
+
+# install requirements
+RUN pip install --upgrade pip
+RUN pip install -r requirements.txt
+
+RUN mkdir -p /usr/src/logs
+
+
+EXPOSE 611
+
+VOLUME ["/usr/src/app"]
+
+ENTRYPOINT ["pypy3", "app.py"]

swarm/stackredis/python-app-example/app.py

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+import os
+from flask import Flask
+from redis.sentinel import Sentinel
+
+app = Flask(__name__)
+
+sentinelHost = os.environ.get("SENTINEL_HOST", None)
+sentinelPort = int(os.environ.get("SENTINEL_PORT", 26379))
+redisMasterName = os.environ.get("REDIS_MASTER_NAME", 'mymaster')
+
+
+
+@app.route('/')
+def hello():
+    if sentinelHost is not None and sentinelPort is not None:
+        try:
+            sentinel = Sentinel([(sentinelHost, sentinelPort)], socket_timeout=0.1)
+            redis_master = sentinel.master_for(redisMasterName, socket_timeout=0.1)
+            redis_slave = sentinel.slave_for(redisMasterName, socket_timeout=0.1)
+
+            incr_and_return_count = redis_master.incr('hits')
+            count_from_slave = redis_slave.get('hits')
+            return 'Hello World! I have been seen {} times. Yes Yeah\n'.format(count_from_slave)
+        except Exception as e:
+            return sentinelHost+ " "+ str(sentinelPort) + 'Exception handled when started to perform actions: Details error {}\n'.format(e)
+    else:
+        return 'Environment variable sentinelHost or sentinelPort  is not found or empty. \n'
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=611, debug=True)

swarm/stackredis/python-app-example/compose-app.yml

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+version: "3.3"
+services:
+  agile-python-app:
+    image: 127.0.0.1:5000/agile-python-app
+    build:
+      context: ./
+      dockerfile: ./Dockerfile.yml

swarm/stackredis/python-app-example/requirements.txt

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+flask
+redis