Add a builtin gateway

Uses: Kong Mesh

Prerequisites

Completed quickstart to set up a zone control plane with demo application

If you are already familiar with quickstart you can set up required environment by running:

sh helm upgrade \ --install \ --create-namespace \ --namespace kong-mesh-system \ kong-mesh kong-mesh/kong-mesh kubectl wait -n kong-mesh-system --for=condition=ready pod --selector=app=kong-mesh-control-plane --timeout=90s kubectl apply -f https://raw.githubusercontent.com/kumahq/kuma-counter-demo/refs/heads/main/k8s/001-with-mtls.yaml

Start a gateway

Create a `MeshGatewayInstance`

A MeshGatewayInstance configures the pods that will run the gateway.

Create it by running:

kubectl apply -f https://raw.githubusercontent.com/kumahq/kuma-counter-demo/refs/heads/main/kustomize/overlays/002-with-gateway/mesh-gateway-instance.yaml

The Kubernetes cluster needs to support LoadBalancer for this to work.

If you are running minikube you will want to open a tunnel with minikube tunnel -p mesh-zone.

You may not have support for LoadBalancer if you are running locally with kind or k3d. When running kind cluster you can try kubernetes-sigs/cloud-provider-kind.

Define a listener using `MeshGateway`

MeshGateway defines listeners for the gateway.

Define a single http listener on port 8080:

kubectl apply -f https://raw.githubusercontent.com/kumahq/kuma-counter-demo/refs/heads/main/kustomize/overlays/002-with-gateway/mesh-gateway.yaml

Notice how the selector selects the kuma.io/service tag of the previously defined MeshGatewayInstance.

Now look at the pods running in the namespace by running:

kubectl get pods -n kuma-demo

Observe the gateway pod:

NAME                            READY   STATUS    RESTARTS   AGE
redis-5fdb98848c-5tw62          2/2     Running   0          5m5s
demo-app-c7cd6588b-rtwlj        2/2     Running   0          5m5s
edge-gateway-66c76fd477-ncsp5   1/1     Running   0          18s

Retrieve the public url for the gateway with:

export PROXY_IP=$(kubectl get svc -n kuma-demo edge-gateway -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
echo $PROXY_IP

Check the gateway is running:

curl -v ${PROXY_IP}:8080

Which outputs:

*   Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080
> GET / HTTP/1.1ó
> Host: 127.0.0.1:8080
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/1.1 404 Not Found
< content-length: 62
< content-type: text/plain
< vary: Accept-Encoding
< date: Fri, 09 Feb 2024 10:07:26 GMT
< server: Kuma Gateway
<
This is a Kuma MeshGateway. No routes match this MeshGateway!

Notice the gateway says that there are no routes configured.

Define a route using `MeshHTTPRoute`

MeshHTTPRoute defines HTTP routes inside your service mesh. Attach a route to an entire gateway or to a single listener by using targetRef.kind: MeshGateway

curl -s https://raw.githubusercontent.com/kumahq/kuma-counter-demo/refs/heads/main/kustomize/overlays/002-with-gateway/mesh-http-route.yaml | sed 's/kuma-system/kong-mesh-system/g' | kubectl apply -f -

Now try to reach our gateway again:

curl -v ${PROXY_IP}:8080

which outputs:

*   Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080
> GET / HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/1.1 403 Forbidden
< content-length: 19
< content-type: text/plain
< date: Fri, 09 Feb 2024 10:10:16 GMT
< server: Kuma Gateway
< x-envoy-upstream-service-time: 24
<
* Connection #0 to host 127.0.0.1 left intact
RBAC: access denied%

Notice the “forbidden” error. The quickstart applies restrictive default permissions, so the gateway can’t access the demo-app service.

To fix this, add a MeshTrafficPermission:

kubectl apply -f https://raw.githubusercontent.com/kumahq/kuma-counter-demo/refs/heads/main/kustomize/overlays/002-with-gateway/mesh-traffic-permission.yaml

Which will create resource:

echo "apiVersion: kuma.io/v1alpha1
kind: MeshTrafficPermission
metadata:
  namespace: kuma-demo 
  name: demo-app
spec:
  targetRef:
    kind: Dataplane
    labels:
      app: demo-app
  from:
    - targetRef:
        kind: MeshSubset
        tags: 
          kuma.io/service: edge-gateway_kuma-demo_svc 
      default:
        action: Allow" | kubectl apply -f -

Check it works with:

curl -XPOST -v ${PROXY_IP}:8080/api/counter

Now returns a 200 OK response:

*   Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080
> POST /api/counter HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< content-type: application/json; charset=utf-8
< x-demo-app-version: v1
< date: Thu, 29 May 2025 10:14:06 GMT
< content-length: 24
< x-envoy-upstream-service-time: 91
< server: Kuma Gateway
<
{"counter":1,"zone":""}
* Connection #0 to host 127.0.0.1 left intact

Securing your public endpoint with a certificate

The application is now exposed to a public endpoint thanks to the gateway. We will now add TLS to our endpoint.

Create a certificate

Create a self-signed certificate:

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=${PROXY_IP}"

echo "apiVersion: v1
kind: Secret
metadata:
  name: my-gateway-certificate
  namespace: kong-mesh-system 
  labels:
    kuma.io/mesh: default
data:
  value: "$(cat tls.key tls.crt | base64)"
type: system.kuma.io/secret" | kubectl apply -f - 

Now update the gateway to use this certificate:

echo "apiVersion: kuma.io/v1alpha1
kind: MeshGateway
mesh: default
metadata:
  name: edge-gateway
spec:
  selectors:
    - match:
        kuma.io/service: edge-gateway_kuma-demo_svc
  conf:
    listeners:
      - port: 8080
        protocol: HTTPS
        tls:
          mode: TERMINATE
          certificates:
            - secret: my-gateway-certificate
        tags:
          port: http-8080" | kubectl apply -f -

Check the call to the gateway:

curl -X POST -v --insecure "https://${PROXY_IP}:8080/api/counter"

Which should output a successful call and indicate TLS is being used:

*   Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080
* ALPN: curl offers h2,http/1.1
* (304) (OUT), TLS handshake, Client hello (1):
* (304) (IN), TLS handshake, Server hello (2):
* (304) (IN), TLS handshake, Unknown (8):
* (304) (IN), TLS handshake, Certificate (11):
* (304) (IN), TLS handshake, CERT verify (15):
* (304) (IN), TLS handshake, Finished (20):
* (304) (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256 / [blank] / UNDEF
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=127.0.0.1
*  start date: May 29 10:15:05 2025 GMT
*  expire date: May 29 10:15:05 2026 GMT
*  issuer: CN=127.0.0.1
*  SSL certificate verify result: self signed certificate (18), continuing anyway.
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://127.0.0.1:8080/api/counter
* [HTTP/2] [1] [:method: POST]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: 127.0.0.1:8080]
* [HTTP/2] [1] [:path: /api/counter]
* [HTTP/2] [1] [user-agent: curl/8.7.1]
* [HTTP/2] [1] [accept: */*]
> POST /api/counter HTTP/2
> Host: 127.0.0.1:8080
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/2 200
< content-type: application/json; charset=utf-8
< x-demo-app-version: v1
< date: Thu, 29 May 2025 10:15:40 GMT
< content-length: 24
< x-envoy-upstream-service-time: 56
< server: Kuma Gateway
< strict-transport-security: max-age=31536000; includeSubDomains
<
{"counter":3,"zone":""}
* Connection #0 to host 127.0.0.1 left intact

Note that we’re using --insecure as we have used a self-signed certificate.

Next steps

Read more about the different types of gateways in the managing ingress traffic docs.
Learn about setting up observability to get full end to end visibility of your mesh.