Init

Dockerfile

+FROM python:3.7
+
+WORKDIR /app
+
+COPY . /app
+
+RUN pip install -r requriements.txt
+
+EXPOSE 80
+
+CMD ["python", "app.py"]
\ No newline at end of file

app.py

+from flask import Flask
+from redis import Redis, RedisError
+import os
+import socket
+
+# Connect to Redis
+redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello():
+    try:
+        visits = redis.incr("counter")
+    except RedisError:
+        visits = "<i>cannot connect to Redis, counter disabled</i>"
+
+    html = "<h3>Hello {name}!</h3>" \
+           "<b>Hostname:</b> {hostname}<br/>" \
+           "<b>Visits:</b> {visits}"
+    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)
+
+
+if __name__ == "__main__":
+    app.run(host='0.0.0.0', port=80)

requriements.txt

+Click==7.0
+Flask==1.1.1
+itsdangerous==1.1.0
+Jinja2==2.10.1
+MarkupSafe==1.1.1
+redis==3.3.8
+Werkzeug==0.15.5