Deployment Mode

10 minute read

Deployment modes

One GatewayClass per Envoy Gateway Controller

An Envoy Gateway is associated with a single GatewayClass resource under one controller. This is the simplest deployment mode and is suitable for scenarios where each Gateway needs to have its own dedicated set of resources and configurations.

Multiple GatewayClasses per Envoy Gateway Controller

An Envoy Gateway is associated with multiple GatewayClass resources under one controller.
Support for accepting multiple GatewayClasses was added here.

Separate Envoy Gateway Controllers

If you’ve instantiated multiple GatewayClasses, you can also run separate Envoy Gateway controllers in different namespaces, linking a GatewayClass to each of them for multi-tenancy. Please follow the example Multi-tenancy.

Merged Gateways onto a single EnvoyProxy fleet

By default, each Gateway has its own dedicated set of Envoy Proxy and its configurations. However, for some deployments, it may be more convenient to merge listeners across multiple Gateways and deploy a single Envoy Proxy fleet.

This can help to efficiently utilize the infra resources in the cluster and manage them in a centralized manner, or have a single IP address for all of the listeners. Setting the mergeGateways field in the EnvoyProxy resource linked to GatewayClass will result in merging all Gateway listeners under one GatewayClass resource.

The tuple of port, protocol, and hostname must be unique across all Listeners.

Please follow the example Merged gateways deployment.

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 or EnvoyGateway.provider.kubernetes.watch.namespaceSelector 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.type=Namespaces \
--set config.envoyGateway.provider.kubernetes.watch.namespaces={marketing} \
eg-marketing oci://docker.io/envoyproxy/gateway-helm \
--version v1.0.2 -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-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
          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.type=Namespaces \
--set config.envoyGateway.provider.kubernetes.watch.namespaces={product} \
eg-product oci://docker.io/envoyproxy/gateway-helm \
--version v1.0.2 -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-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
          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 no 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

Merged gateways deployment

In this example, we will deploy GatewayClass

apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: merged-eg
spec:
  controllerName: gateway.envoyproxy.io/gatewayclass-controller
  parametersRef:
    group: gateway.envoyproxy.io
    kind: EnvoyProxy
    name: custom-proxy-config
    namespace: envoy-gateway-system

with a referenced EnvoyProxy resource configured to enable merged Gateways deployment mode.

apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyProxy
metadata:
  name: custom-proxy-config
  namespace: envoy-gateway-system
spec:
  mergeGateways: true

Deploy merged-gateways example

Deploy resources on your cluster from the example.

kubectl apply -f https://raw.githubusercontent.com/envoyproxy/gateway/latest/examples/kubernetes/merged-gateways.yaml

Verify that Gateways are deployed and programmed

kubectl get gateways -n default

NAMESPACE   NAME          CLASS       ADDRESS          PROGRAMMED   AGE
default     merged-eg-1   merged-eg   172.18.255.202   True         2m4s
default     merged-eg-2   merged-eg   172.18.255.202   True         2m4s
default     merged-eg-3   merged-eg   172.18.255.202   True         2m4s

Verify that HTTPRoutes are deployed

kubectl get httproute -n default
NAMESPACE   NAME              HOSTNAMES             AGE
default     hostname1-route   ["www.merged1.com"]   2m4s
default     hostname2-route   ["www.merged2.com"]   2m4s
default     hostname3-route   ["www.merged3.com"]   2m4s

If you take a look at the deployed Envoy Proxy service you would notice that all of the Gateway listeners ports are added to that service.

kubectl get service -n envoy-gateway-system
NAME                            TYPE           CLUSTER-IP      EXTERNAL-IP      PORT(S)                                        AGE
envoy-gateway                   ClusterIP      10.96.141.4     <none>           18000/TCP,18001/TCP                            6m43s
envoy-gateway-metrics-service   ClusterIP      10.96.113.191   <none>           19001/TCP                                      6m43s
envoy-merged-eg-668ac7ae        LoadBalancer   10.96.48.255    172.18.255.202   8081:30467/TCP,8082:31793/TCP,8080:31153/TCP   3m17s

There should be also one deployment (envoy-merged-eg-668ac7ae-775f9865d-55zhs) for every Gateway and its name should reference the name of the GatewayClass.

kubectl get pods -n envoy-gateway-system
NAME                                       READY   STATUS    RESTARTS       AGE
envoy-gateway-5d998778f6-wr6m9             1/1     Running   0              6m43s
envoy-merged-eg-668ac7ae-775f9865d-55zhs   2/2     Running   0              3m17s

Testing the Configuration

Get the name of the merged gateways Envoy service:

export ENVOY_SERVICE=$(kubectl get svc -n envoy-gateway-system --selector=gateway.envoyproxy.io/owning-gatewayclass=merged-eg -o jsonpath='{.items[0].metadata.name}')

Fetch external IP of the service:

export GATEWAY_HOST=$(kubectl get svc/${ENVOY_SERVICE} -n envoy-gateway-system -o jsonpath='{.status.loadBalancer.ingress[0].ip}')

In certain environments, the load balancer may be exposed using a hostname, instead of an IP address. If so, replace ip in the above command with hostname.

Curl the route hostname-route2 through Envoy proxy:

curl --header "Host: www.merged2.com" http://$GATEWAY_HOST:8081/example2

{
 "path": "/example2",
 "host": "www.merged2.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/8.4.0"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "172.18.0.2"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "deed2767-a483-4291-9429-0e256ab3a65f"
  ]
 },
 "namespace": "default",
 "ingress": "",
 "service": "",
 "pod": "merged-backend-64ddb65fd7-ttv5z"
}

Curl the route hostname-route1 through Envoy proxy:

curl --header "Host: www.merged1.com" http://$GATEWAY_HOST:8080/example

{
 "path": "/example",
 "host": "www.merged1.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/8.4.0"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "172.18.0.2"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "20a53440-6327-4c3c-bc8b-8e79e7311043"
  ]
 },
 "namespace": "default",
 "ingress": "",
 "service": "",
 "pod": "merged-backend-64ddb65fd7-ttv5z"
}

Verify deployment of multiple GatewayClass

Install the GatewayClass, Gateway, HTTPRoute and example app from Quickstart example:

kubectl apply -f https://github.com/envoyproxy/gateway/releases/download/latest/quickstart.yaml -n default

Lets create also and additional Gateway linked to the GatewayClass and backend application from Quickstart example.

cat <<EOF | kubectl apply -f -
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: eg-2
  namespace: default
spec:
  gatewayClassName: eg
  listeners:
    - name: http
      protocol: HTTP
      port: 8080
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: eg-2
  namespace: default
spec:
  parentRefs:
    - name: eg-2
  hostnames:
    - "www.quickstart.example.com"
  rules:
    - backendRefs:
        - group: ""
          kind: Service
          name: backend
          port: 3000
          weight: 1
      matches:
        - path:
            type: PathPrefix
            value: /
EOF

Verify that Gateways are deployed and programmed

kubectl get gateways -n default

NAME          CLASS       ADDRESS          PROGRAMMED   AGE
eg            eg          172.18.255.203   True         114s
eg-2          eg          172.18.255.204   True         89s
merged-eg-1   merged-eg   172.18.255.202   True         8m33s
merged-eg-2   merged-eg   172.18.255.202   True         8m33s
merged-eg-3   merged-eg   172.18.255.202   True         8m33s

Verify that HTTPRoutes are deployed

kubectl get httproute -n default

NAMESPACE   NAME              HOSTNAMES                        AGE
default     backend           ["www.example.com"]              2m29s
default     eg-2              ["www.quickstart.example.com"]   87s
default     hostname1-route   ["www.merged1.com"]              10m4s
default     hostname2-route   ["www.merged2.com"]              10m4s
default     hostname3-route   ["www.merged3.com"]              10m4s

Verify that services are now deployed separately.

kubectl get service -n envoy-gateway-system

NAME                            TYPE           CLUSTER-IP      EXTERNAL-IP      PORT(S)                                        AGE
envoy-default-eg-2-7e515b2f     LoadBalancer   10.96.121.46    172.18.255.204   8080:32705/TCP                                 3m27s
envoy-default-eg-e41e7b31       LoadBalancer   10.96.11.244    172.18.255.203   80:31930/TCP                                   2m26s
envoy-gateway                   ClusterIP      10.96.141.4     <none>           18000/TCP,18001/TCP                            14m25s
envoy-gateway-metrics-service   ClusterIP      10.96.113.191   <none>           19001/TCP                                      14m25s
envoy-merged-eg-668ac7ae        LoadBalancer   10.96.243.32    172.18.255.202   8082:31622/TCP,8080:32262/TCP,8081:32305/TCP   10m59s

There should be two deployments for each of newly deployed Gateway and its name should reference the name of the namespace and the Gateway.

kubectl get pods -n envoy-gateway-system

NAME                                          READY   STATUS    RESTARTS   AGE
envoy-default-eg-2-7e515b2f-8c98fdf88-p6jhg   2/2     Running   0          3m27s
envoy-default-eg-e41e7b31-6f998d85d7-jpvmj    2/2     Running   0          2m26s
envoy-gateway-5d998778f6-wr6m9                1/1     Running   0          14m25s
envoy-merged-eg-668ac7ae-5958f7b7f6-9h9v2     2/2     Running   0          10m59s

Testing the Configuration

Get the name of the merged gateways Envoy service:

export DEFAULT_ENVOY_SERVICE=$(kubectl get svc -n envoy-gateway-system --selector=gateway.envoyproxy.io/owning-gateway-namespace=default,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')

Fetch external IP of the service:

export DEFAULT_GATEWAY_HOST=$(kubectl get svc/${DEFAULT_ENVOY_SERVICE} -n envoy-gateway-system -o jsonpath='{.status.loadBalancer.ingress[0].ip}')

Curl the route Quickstart backend route through Envoy proxy:

curl --header "Host: www.example.com" http://$DEFAULT_GATEWAY_HOST

{
 "path": "/",
 "host": "www.example.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/8.4.0"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "172.18.0.2"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "70a40595-67a1-4776-955b-2dee361baed7"
  ]
 },
 "namespace": "default",
 "ingress": "",
 "service": "",
 "pod": "backend-96f75bbf-6w67z"
}

Curl the route hostname-route3 through Envoy proxy:

curl --header "Host: www.merged3.com" http://$GATEWAY_HOST:8082/example3

{
 "path": "/example3",
 "host": "www.merged3.com",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/8.4.0"
  ],
  "X-Envoy-Internal": [
   "true"
  ],
  "X-Forwarded-For": [
   "172.18.0.2"
  ],
  "X-Forwarded-Proto": [
   "http"
  ],
  "X-Request-Id": [
   "47aeaef3-abb5-481a-ab92-c2ae3d0862d6"
  ]
 },
 "namespace": "default",
 "ingress": "",
 "service": "",
 "pod": "merged-backend-64ddb65fd7-k84gv"
}

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