Deployment Mode

  6 minute read  

One GatewayClass per Envoy Gateway

  • Envoy Gateway can accept a single GatewayClass resource. If you’ve instantiated multiple GatewayClasses, we recommend running multiple Envoy Gateway controllers in different namespaces, linking a GatewayClass to each of them.
  • Support for accepting multiple GatewayClass is being tracked here.

Supported Modes

Kubernetes

  • The default deployment model is - Envoy Gateway watches for resources such a Service & HTTPRoute in all namespaces and creates managed data plane resources such as EnvoyProxy Deployment in the namespace where Envoy Gateway is running.
  • Envoy Gateway also supports Namespaced deployment mode, you can watch resources in the specific namespaces by assigning EnvoyGateway.provider.kubernetes.watch.namespaces and creates managed data plane resources in the namespace where Envoy Gateway is running.
  • Support for alternate deployment modes is being tracked here.

Multi-tenancy

Kubernetes

  • A tenant is a group within an organization (e.g. a team or department) who shares organizational resources. We recommend each tenant deploy their own Envoy Gateway controller in their respective namespace. Below is an example of deploying Envoy Gateway by the marketing and product teams in separate namespaces.

  • Lets deploy Envoy Gateway in the marketing namespace and also watch resources only in this namespace. We are also setting the controller name to a unique string here gateway.envoyproxy.io/marketing-gatewayclass-controller.

helm install --set config.envoyGateway.gateway.controllerName=gateway.envoyproxy.io/marketing-gatewayclass-controller --set config.envoyGateway.provider.kubernetes.watch.namespaces={marketing} eg-marketing oci://docker.io/envoyproxy/gateway-helm --version v0.6.0 -n marketing --create-namespace

Lets create a GatewayClass linked to the marketing team’s Envoy Gateway controller, and as well other resources linked to it, so the backend application operated by this team can be exposed to external clients.

cat <<EOF | kubectl apply -f -
apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: eg-marketing
spec:
  controllerName: gateway.envoyproxy.io/marketing-gatewayclass-controller
---
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: eg
  namespace: marketing
spec:
  gatewayClassName: eg-marketing
  listeners:
    - name: http
      protocol: HTTP
      port: 8080
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: backend
  namespace: marketing
---
apiVersion: v1
kind: Service
metadata:
  name: backend
  namespace: marketing
  labels:
    app: backend
    service: backend
spec:
  ports:
    - name: http
      port: 3000
      targetPort: 3000
  selector:
    app: backend
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend
  namespace: marketing
spec:
  replicas: 1
  selector:
    matchLabels:
      app: backend
      version: v1
  template:
    metadata:
      labels:
        app: backend
        version: v1
    spec:
      serviceAccountName: backend
      containers:
        - image: gcr.io/k8s-staging-ingressconformance/echoserver:v20221109-7ee2f3e
          imagePullPolicy: IfNotPresent
          name: backend
          ports:
            - containerPort: 3000
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: backend
  namespace: marketing
spec:
  parentRefs:
    - name: eg
  hostnames:
    - "www.marketing.example.com"
  rules:
    - backendRefs:
        - group: ""
          kind: Service
          name: backend
          port: 3000
          weight: 1
      matches:
        - path:
            type: PathPrefix
            value: /
EOF

Lets port forward to the generated envoy proxy service in the marketing namespace and send a request to it.

export ENVOY_SERVICE=$(kubectl get svc -n marketing --selector=gateway.envoyproxy.io/owning-gateway-namespace=marketing,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')
kubectl -n marketing port-forward service/${ENVOY_SERVICE} 8888:8080 &

curl --verbose --header "Host: www.marketing.example.com" http://localhost:8888/get

*   Trying 127.0.0.1:8888...
* Connected to localhost (127.0.0.1) port 8888 (#0)
> GET /get HTTP/1.1
> Host: www.marketing.example.com
> User-Agent: curl/7.86.0
> Accept: */*
>
Handling connection for 8888
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< content-type: application/json
< x-content-type-options: nosniff
< date: Thu, 20 Apr 2023 19:19:42 GMT
< content-length: 521
< x-envoy-upstream-service-time: 0
< server: envoy
<
{
 "path": "/get",
 "host": "www.marketing.example.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/7.86.0"
  ],
  "X-Envoy-Expected-Rq-Timeout-Ms": [
   "15000"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "10.1.0.157"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "c637977c-458a-48ae-92b3-f8c429849322"
  ]
 },
 "namespace": "marketing",
 "ingress": "",
 "service": "",
 "pod": "backend-74888f465f-bcs8f"
* Connection #0 to host localhost left intact
  • Lets deploy Envoy Gateway in the product namespace and also watch resources only in this namespace.
helm install --set config.envoyGateway.gateway.controllerName=gateway.envoyproxy.io/product-gatewayclass-controller --set config.envoyGateway.provider.kubernetes.watch.namespaces={product} eg-product oci://docker.io/envoyproxy/gateway-helm --version v0.6.0 -n product --create-namespace

Lets create a GatewayClass linked to the product team’s Envoy Gateway controller, and as well other resources linked to it, so the backend application operated by this team can be exposed to external clients.

cat <<EOF | kubectl apply -f -
apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: eg-product
spec:
  controllerName: gateway.envoyproxy.io/product-gatewayclass-controller
---
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: eg
  namespace: product
spec:
  gatewayClassName: eg-product
  listeners:
    - name: http
      protocol: HTTP
      port: 8080
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: backend
  namespace: product
---
apiVersion: v1
kind: Service
metadata:
  name: backend
  namespace: product
  labels:
    app: backend
    service: backend
spec:
  ports:
    - name: http
      port: 3000
      targetPort: 3000
  selector:
    app: backend
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend
  namespace: product
spec:
  replicas: 1
  selector:
    matchLabels:
      app: backend
      version: v1
  template:
    metadata:
      labels:
        app: backend
        version: v1
    spec:
      serviceAccountName: backend
      containers:
        - image: gcr.io/k8s-staging-ingressconformance/echoserver:v20221109-7ee2f3e
          imagePullPolicy: IfNotPresent
          name: backend
          ports:
            - containerPort: 3000
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: backend
  namespace: product
spec:
  parentRefs:
    - name: eg
  hostnames:
    - "www.product.example.com"
  rules:
    - backendRefs:
        - group: ""
          kind: Service
          name: backend
          port: 3000
          weight: 1
      matches:
        - path:
            type: PathPrefix
            value: /
EOF

Lets port forward to the generated envoy proxy service in the product namespace and send a request to it.

export ENVOY_SERVICE=$(kubectl get svc -n product --selector=gateway.envoyproxy.io/owning-gateway-namespace=product,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')
kubectl -n product port-forward service/${ENVOY_SERVICE} 8889:8080 &

curl --verbose --header "Host: www.product.example.com" http://localhost:8889/get

*   Trying 127.0.0.1:8889...
* Connected to localhost (127.0.0.1) port 8889 (#0)
> GET /get HTTP/1.1
> Host: www.product.example.com
> User-Agent: curl/7.86.0
> Accept: */*
> 
Handling connection for 8889
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< content-type: application/json
< x-content-type-options: nosniff
< date: Thu, 20 Apr 2023 19:20:17 GMT
< content-length: 517
< x-envoy-upstream-service-time: 0
< server: envoy
< 
{
 "path": "/get",
 "host": "www.product.example.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/7.86.0"
  ],
  "X-Envoy-Expected-Rq-Timeout-Ms": [
   "15000"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "10.1.0.156"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "39196453-2250-4331-b756-54003b2853c2"
  ]
 },
 "namespace": "product",
 "ingress": "",
 "service": "",
 "pod": "backend-74888f465f-64fjs"
* Connection #0 to host localhost left intact

With the below command you can ensure that you are not able to access the marketing team’s backend exposed using the www.marketing.example.com hostname and the product team’s data plane.

curl --verbose --header "Host: www.marketing.example.com" http://localhost:8889/get

*   Trying 127.0.0.1:8889...
* Connected to localhost (127.0.0.1) port 8889 (#0)
> GET /get HTTP/1.1
> Host: www.marketing.example.com
> User-Agent: curl/7.86.0
> Accept: */*
>
Handling connection for 8889
* Mark bundle as not supporting multiuse
< HTTP/1.1 404 Not Found
< date: Thu, 20 Apr 2023 19:22:13 GMT
< server: envoy
< content-length: 0
<
* Connection #0 to host localhost left intact

Last modified December 20, 2024: chore: fix typo (#4958) (2a10d47)