added env var for port number

Signed-off-by: Paul Schultz <[email protected]>

Author: schultzp2020

app.py

@@ -1,4 +1,5 @@
 from flask import Flask
+import os
 
 app = Flask(__name__)
 
@@ -7,4 +8,9 @@ def hello():
     return "Hello World!"
 
 if __name__ == '__main__':
-    app.run(port=8080,host='0.0.0.0')
+    port = int(os.environ.get('FLASK_PORT'))
+
+    if port == None:
+        port = 8080
+
+    app.run(port=port,host='0.0.0.0')

docker/Dockerfile

@@ -2,6 +2,7 @@ FROM python:slim
 
 # By default, listen on port 8081
 EXPOSE 8081/tcp
+ENV FLASK_PORT=8081
 
 # Set the working directory in the container
 WORKDIR /projects