Python sample project for GKE

The sample project to deploy Python REST API application, Service, HorizontalPodAutoscaler, Ingress, and BackendConfig on GKE.

• app.py
• python-ping-api-template.yaml

---

Prerequisites

Installation

• Install the gcloud CLI
• Install kubectl and configure cluster access

Set environment variables

PROJECT_ID="sample-project" # replace with your project
COMPUTE_ZONE="us-central1"

Set GCP project

gcloud config set project ${PROJECT_ID}
gcloud config set compute/zone ${COMPUTE_ZONE}

---

Create a GKE cluster

Create an Autopilot GKE cluster. It may take around 9 minutes.

gcloud container clusters create-auto sample-cluster --region=${COMPUTE_ZONE}
gcloud container clusters get-credentials sample-cluster

---

Deploy python-ping-api

Build and push to GCR:

cd ../app
docker build -t python-ping-api . --platform linux/amd64
docker tag python-ping-api:latest gcr.io/${PROJECT_ID}/python-ping-api:latest

gcloud auth configure-docker
docker push gcr.io/${PROJECT_ID}/python-ping-api:latest

Create and deploy K8s Deployment, Service, HorizontalPodAutoscaler, Ingress, and GKE BackendConfig using the python-ping-api-template.yaml template file.

sed -e "s|<project-id>|${PROJECT_ID}|g" python-ping-api-template.yaml > python-ping-api.yaml
cat python-ping-api.yaml

kubectl apply -f python-ping-api.yaml

It may take around 5 minutes to create a load balancer, including health checking.

Confirm that pod configuration and logs after deployment:

kubectl logs -l app=python-ping-api

kubectl describe pods

kubectl get ingress python-ping-api-ingress

Confirm that response of /ping API.

LB_IP_ADDRESS=$(gcloud compute forwarding-rules list | grep python-ping-api | awk '{ print $2 }')
echo ${LB_IP_ADDRESS}

curl http://${LB_IP_ADDRESS}/ping

{
  "host": "<your-ingress-endpoint-ip>",
  "message": "ping-api",
  "method": "GET",
  "url": "http://<your-ingress-endpoint-ip>/ping"
}

---

Screenshots

• Loadbalncer

• Loadbalncer Details

---

Cleanup

kubectl delete -f app/python-ping-api.yaml

gcloud container clusters delete sample-cluster

References

• Cloud SDK > Documentation > Reference > gcloud container clusters

• Google Kubernetes Engine (GKE) > Documentation > Guides > GKE Ingress for HTTP(S) Load Balancing