move files around

docker/docker-sample/Dockerfile

@@ -0,0 +1,9 @@
+FROM python:3.7-alpine
+WORKDIR /code
+ENV FLASK_APP app.py
+ENV FLASK_RUN_HOST 0.0.0.0
+RUN apk add --no-cache gcc musl-dev linux-headers
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+COPY . .
+CMD ["flask", "run"]

docker/docker-sample/app.py

@@ -0,0 +1,25 @@
+import time
+
+import redis
+from flask import Flask
+
+app = Flask(__name__)
+cache = redis.Redis(host='redis', port=6379)
+
+
+def get_hit_count():
+    retries = 5
+    while True:
+        try:
+            return cache.incr('hits')
+        except redis.exceptions.ConnectionError as exc:
+            if retries == 0:
+                raise exc
+            retries -= 1
+            time.sleep(0.5)
+
+
+@app.route('/')
+def hello():
+    count = get_hit_count()
+    return 'Hello World! I have been seen {} times.\n'.format(count)

docker/docker-sample/docker-compose.yml

@@ -0,0 +1,8 @@
+version: '3'
+services:
+  web:
+    build: .
+    ports:
+      - "5001:5000"
+  redis:
+    image: "redis:alpine"

docker/docker-sample/pod.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: demo
+spec:
+  containers:
+    - name: testpod
+      image: alpine:3.5
+      command: ["ping", "8.8.8.8"]
+

docker/docker-sample/requirements.txt

@@ -0,0 +1,2 @@
+flask
+redis