I’m trying to learn k3s by deploying a simple nginx app where I use configmaps as a volume to mount my index.html file.

# Deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-world-nginx
spec:
  selector:
    matchLabels:
      app: hello-world
  replicas: 1
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - name: hello-world-volume
          mountPath: /usr/share/nginx/html
      volumes:
      - name: hello-world-volume
        configMap:
          name: hello-world
---
# Service
apiVersion: v1
kind: Service
metadata:
  name: hello-world-service
spec:
  ports:
    - port: 80
      protocol: TCP
  selector:
    app: hello-world
---
# Ingress
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: hello-world
  annotations:
    spec.ingressClassName: "traefik"
spec:
  rules:
  - http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: hello-world-service
            port:
              number: 80

This seems to work but when I add more replicas replicas: 3. If I keep refreshing the page, I would get the output I expected 1 out of 3 but 2 out of 3 times, I get a Bad Gateway error.