Unable to make request to service running in Minikube tunnel - docker

Question

I am working on an API that I will deploy with Kubernetes and I want to test it locally.
I created the Docker image, successfully tested it locally, and pushed it to a public Docker registry. Now I would like to deploy in a Kubernetes cluster and there are no errors being thrown, however, I am not able to make a request to the endpoint exposed by the Minikube tunnel.
Steps to reproduce:
Start Minikube container: minikube start --ports=127.0.0.1:30000:30000
Create deployment and service: kubectl apply -f fastapi.yaml
Start minikube tunnel: minikube service fastapi-server
Encountered the following error: 192.168.49.2 took too long to respond.
requirements.txt:
anyio==3.6.1
asgiref==3.5.2
click==8.1.3
colorama==0.4.4
fastapi==0.78.0
h11==0.13.0
httptools==0.4.0
idna==3.3
pydantic==1.9.1
python-dotenv==0.20.0
PyYAML==6.0
sniffio==1.2.0
starlette==0.19.1
typing_extensions==4.2.0
uvicorn==0.17.6
watchgod==0.8.2
websockets==10.3
main.py:
from fastapi import FastAPI
app = FastAPI()
#app.get("/")
async def root():
return {"status": "OK"}
Dockerfile:
FROM python:3.9
WORKDIR /
COPY . .
RUN pip install --no-cache-dir --upgrade -r ./requirements.txt
EXPOSE 8000
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
fastapi.yaml:
# deployment
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: fastapi-server
name: fastapi-server
spec:
replicas: 1
selector:
matchLabels:
app: fastapi-server
template:
metadata:
labels:
app: fastapi-server
spec:
containers:
- name: fastapi-server
image: smdf/fastapi-test
ports:
- containerPort: 8000
name: http
protocol: TCP
---
# service
apiVersion: v1
kind: Service
metadata:
labels:
app: fastapi-server
name: fastapi-server
spec:
type: LoadBalancer
ports:
- port: 8000
targetPort: 8000
protocol: TCP
nodePort: 30000

Answer 1

Your problem is that you did not set the service selector:
# service
apiVersion: v1
kind: Service
metadata:
labels:
app: fastapi-server
name: fastapi-server
spec:
selector: <------------- Missing part
app: fastapi-server <-------------
type: NodePort <------------- Set the type to NodePort
ports:
- port: 8000
targetPort: 8000
protocol: TCP
nodePort: 30000
How to check if your service is defined properly?
I checked to see if there are any endpoints, and there weren't any since you did not "attach" the service to your deployment
kubectl get endpoints -A
For more info you can read this section under my GitHub
https://github.com/nirgeier/KubernetesLabs/tree/master/Labs/05-Services