Experiment with load shedding.

Author: luhn

docker-compose.yml

@@ -8,6 +8,8 @@ services:
       - gunicorn
     ports:
       - "8080:8000"
+    environment:
+      - LOG=/var/log/nginx/access.log
 
   gunicorn:
     build: sampleapp

run.sh

@@ -129,6 +129,9 @@ http {
 		$BIND
 		$HEADERS
 
+		proxy_connect_timeout 5s;
+		# proxy_send_timeout 5s;
+
 		location / {
 			proxy_pass http://app_upstream;
 			proxy_redirect off;

sampleapp/Dockerfile

@@ -3,4 +3,4 @@ FROM python:3.8-slim
 RUN pip install gunicorn==20.0.4
 COPY app.py .
 
-CMD ["gunicorn", "--bind", "0.0.0.0:8000", "app:application"]
+CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--backlog", "0", "app:application"]

sampleapp/app.py

@@ -1,5 +1,19 @@
+from time import sleep
+
 
 def application(environ, start_response):
+    path = environ['PATH_INFO'].strip('/')
+    if path == 'healthcheck':
+        status = '200 OK'
+        headers = [('Content-type', 'text/plain')]
+        start_response(status, headers)
+        return [b"OK\n"]
+    elif path:
+        try:
+            sleep_time = float(path)
+        except ValueError:
+            raise ValueError('Path must be an integer or float.')
+        sleep(sleep_time)
     status = '200 OK'
     headers = [('Content-type', 'text/plain')]
     start_response(status, headers)