How to fix Gateway API Not Installed in Kubernetes

kubectl get crd | grep gateway
kubectl get crd gateway.networking.k8s.io
kubectl api-resources | grep gateway

# Check for specific resources:
kubectl api-resources | grep -E "gateway|httproute|tlsroute"

# Or:
kubectl get crd -o name | grep gateway

kubectl version --short
# Kubernetes 1.18+ supports Gateway API
# But 1.20+ is recommended for stable features

# Check feature gates:
kubectl get pod -n kube-system kube-apiserver-<node> -o yaml | grep feature-gates

# Gateway API v1.0 is stable in Kubernetes 1.30+
# Earlier versions use v1beta1 or v1alpha2

# Latest stable (v1.0.0+)
kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.0.0/standard-install.yaml

# Or if using experimental features:
kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.0.0/experimental-install.yaml

# Verify installation:
kubectl get crd | grep gateway
kubectl api-resources | grep gateway

# Option 1: Envoy Gateway
kubectl apply -f https://github.com/envoyproxy/gateway/releases/latest/download/install.yaml

# Option 2: Contour (with Gateway API support)
kubectl apply -f https://projectcontour.io/quickstart/contour.yaml

# Option 3: Kong Ingress Controller
helm install kong kong/kong -n kong --create-namespace \
  --set ingressController.enabled=true \
  --set gateway.enabled=true

# Option 4: istiod (Istio)
istioctl install

# Verify controller is running:
kubectl get pods -n envoy-gateway-system  # or controller namespace

kubectl apply -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: my-gateway
spec:
  gatewayClassName: envoy  # Or your controller class name
  listeners:
  - name: http
    port: 80
    protocol: HTTP
EOF

# Check status:
kubectl get gateway
kubectl describe gateway my-gateway

kubectl apply -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: my-route
spec:
  parentRefs:
  - name: my-gateway
  hostnames:
  - "example.com"
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /api
    backendRefs:
    - name: my-service
      port: 8080
EOF

# Verify:
kubectl get httproute
kubectl describe httproute my-route

# Ingress is built-in (no install needed)
kubectl apply -f - <<EOF
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  ingressClassName: nginx
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: my-service
            port:
              number: 80
EOF

kubectl get ingress

kubectl get gateway,httproute,tlsroute -A
kubectl describe gateway <name>

# Check controller logs:
kubectl logs -n envoy-gateway-system -l control-plane=envoy-gateway -f
kubectl logs -n contour-system deployment/contour -f  # For Contour

# Monitor for errors:
kubectl get events -n <namespace> --sort-by=.metadata.creationTimestamp