kind: Service
metadata:
  name: helloworld
  labels:
    app: helloworld
    service: helloworld
spec:
  ports:
  - port: 5000
    name: http
  selector:
    app: helloworld
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: helloworld-v1
  labels:
    app: helloworld
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: helloworld
      version: v1
  template:

apiVersion: v1
kind: Service
metadata:
  name: helloworld
  labels:
    app: helloworld
    service: helloworld
spec:
  ports:
  - port: 5000
    name: http
  selector:
    app: helloworld
EOF
)

DEPLOYMENT_YAML=$(cat <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: helloworld-${SERVICE_VERSION}
  labels:
    app: helloworld
    version: ${SERVICE_VERSION}
spec:
  replicas: 1

kind: Gateway
metadata:
  name: helloworld-gateway
spec:
  gatewayClassName: istio
  listeners:
  - name: http
    port: 80
    protocol: HTTP
    allowedRoutes:
      namespaces:
        from: Same
---
apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: helloworld
spec:
  parentRefs:
  - name: helloworld-gateway
  rules:
  - matches:
    - path:

apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: helloworld
spec:
  parentRefs:
  - name: helloworld-gateway
  rules:
  - matches:
    - path:
        type: Exact
        value: /hello
    backendRefs:
    - name: helloworld-v1
      port: 5000
      weight: 90
    - name: helloworld-v2
      port: 5000

apiVersion: v1
kind: Service
metadata:
  name: helloworld-v1
spec:
  ports:
  - port: 5000
    name: http
  selector:
    app: helloworld
    version: v1
---
apiVersion: v1
kind: Service
metadata:
  name: helloworld-v2
spec:
  ports:
  - port: 5000
    name: http
  selector:
    app: helloworld

apiVersion: v1
kind: Service
metadata:
  name: helloworld
  labels:
    app: helloworld
    service: helloworld
spec:
  ipFamilyPolicy: RequireDualStack
  ipFamilies:
  - IPv6
  - IPv4
  ports:
  - port: 5000
    name: http
  selector:
    app: helloworld
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: helloworld-v1
  labels:
    app: helloworld
    version: v1
spec:
  replicas: 1

Austin Clements <******@****.***> 1683216807 -0400

Louis Jacomet <******@****.***> 1711728981 +0100

Tom Tresansky <******@****.***> 1695070360 -0400

To run both versions of the helloworld service, use the following command:

```bash
kubectl apply -f helloworld.yaml
```

Alternatively, you can run just one version at a time by first defining the service:

```bash
kubectl apply -f helloworld.yaml -l service=helloworld
```

and then deploying version v1, v2, or both:

```bash
kubectl apply -f helloworld.yaml -l version=v1