Create an echo service docker image.

kubernetes/autoscale/service/Dockerfile

@@ -0,0 +1,17 @@
+FROM python:3.9
+
+RUN useradd -m -g nogroup server
+USER server
+
+WORKDIR /home/server
+ENV FLASK_APP=main.py
+
+# Perform the install of requirements first to avoid re-installing on every code change
+COPY requirements.txt /home/server/
+RUN pip install -r /home/server/requirements.txt
+
+COPY *.py /home/server/
+
+# CMD ["python", "/home/server/main.py"]
+
+CMD ["/home/server/.local/bin/gunicorn", "--config", "/home/server/gunicorn.conf.py", "main:app"]

kubernetes/autoscale/service/Makefile

@@ -0,0 +1,21 @@
+IMAGE_NAME:=echoservice
+
+.PHONY: all
+all: build push
+
+.PHONY: build
+build:
+	docker build -t $(IMAGE_NAME) .
+
+.PHONY: push
+push:
+	docker tag $(IMAGE_NAME) gcr.io/hip-wharf-319304/$(IMAGE_NAME)
+	docker push gcr.io/hip-wharf-319304/$(IMAGE_NAME)
+
+.PHONY: clean
+clean:
+	docker rmi $(IMAGE_NAME) gcr.io/hip-wharf-319304/$(IMAGE_NAME) $(IMAGE_NAME)
+
+.PHONY: run
+run:
+	docker run --rm -i -t -p "8080:8080" $(IMAGE_NAME)

kubernetes/autoscale/service/gunicorn.conf.py

@@ -0,0 +1,10 @@
+import multiprocessing
+import os
+
+env_port = int(os.environ.get("PORT", 8080))
+
+bind = f"0.0.0.0:{env_port}"
+workers = max(2, multiprocessing.cpu_count() * 2 + 1)
+preload_app = True
+max_requests = 100
+max_requests_jitter = 50

kubernetes/autoscale/service/main.py

@@ -0,0 +1,28 @@
+import json
+import os
+
+from flask import Flask, request
+
+app = Flask(__name__)
+
+
+def get_request_params():
+    request_json = request.get_json(silent=True)
+    request_args = request.args
+    if request_json:
+        return request_json
+    elif request_args:
+        return request_args
+    else:
+        return None
+
+
+@app.route("/", methods=("GET", "POST"))
+def index():
+    return json.dumps(
+        {"headers": {k: v for k, v in request.headers}, "params": get_request_params()}
+    )
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 8080)), debug=True)

kubernetes/autoscale/service/requirements.txt

@@ -0,0 +1,2 @@
+flask==1.1.2
+gunicorn==20.1.0