make flask configurable

Author: mikespub

.env

@@ -0,0 +1 @@
+FLASK_PORT=5080

Dockerfile

@@ -11,10 +11,12 @@ RUN pip install -r requirements.txt
 # Copy our code from the current folder to /app inside the container
 ADD . /app
 
-# Make port 5000 available for links and/or publish
-EXPOSE 80 
+# Make port 5080 available for links and/or publish
+ENV FLASK_PORT 5080
+EXPOSE $FLASK_PORT
 
 # Environment Variables
+ENV FLASK_HOST 0.0.0.0
 ENV NAME World
 
 # Define our command to be run when launching the container

app.py

@@ -11,16 +11,21 @@
 
 @app.route("/")
 def hello():
+    from flask import request
+    import json
+    info = json.dumps(request.environ, indent=2, default=lambda o: repr(o))
     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)
+           "<b>Visits:</b> {visits}<br/>" \
+           "<b>File:</b> {file}<br/>" \
+           "<b>Environ:</b> <pre>{environ}</pre>"
+    return html.format(name=os.getenv('NAME', "world"), hostname=socket.gethostname(), visits=visits, file=__file__, environ=info.replace('<', '&lt;'))
 
 
 if __name__ == "__main__":
-	app.run(host='0.0.0.0', port=80)
+	app.run(host=os.getenv('FLASK_HOST', '0.0.0.0'), port=int(os.getenv('FLASK_PORT', 5080)))

docker-compose.yml

@@ -1,8 +1,13 @@
-web:
-  build: .
-  links:
-    - redis
-  ports:
-    - "5000:80"
-redis:
-  image: redis
+version: '3'
+services:
+  web:
+    build: .
+    links:
+      - redis
+    ports:
+      - "${FLASK_PORT}:5080"
+    environment:
+      - FLASK_PORT=5080
+      - FLASK_HOST=0.0.0.0
+  redis:
+    image: redis