Installation

To utilize the FSM Gateway, initial activation within the FSM is requisite. Analogous to the FSM Ingress, two distinct methodologies exist for its enablement.

Note: It is imperative to acknowledge that the minimum required version of Kubernetes to facilitate the FSM Gateway activation is v1.21.0.

Let’s start.

Prerequisites

• Kubernetes cluster version v1.21.0 or higher.
• FSM version >= v1.1.0.
• FSM CLI to install FSM and enable FSM Gateway.

Installation

One methodology for enabling FSM Gateway is enable it during FSM installation. Remember that it’s diabled by defaulty.

fsm install \
    --set=fsm.fsmGateway.enabled=true

Another approach is installing it individually if you already have FSM mesh installed.

fsm gateway enable

Once done, we can check the GatewayClass resource in cluster.

kubectl get GatewayClass
NAME              CONTROLLER                      ACCEPTED   AGE
fsm-gateway-cls   flomesh.io/gateway-controller   True       113s

Yes, the fsm-gateway-cls is just the one we are expecting. We can also get the controller name above.

Different from Ingress controller, there is no explicit Deployment or Pod unless create a Gateway manually.

Let’s try with below to create a simple FSM gateway.

Quickstart

To create a FSM gateway, we need to create Gateway resource. This manifest will setup a gateway which will listen on port 8000 and accept the xRoute resources from same namespace.

xRoute stands for HTTPRoute, HTTPRoute, TLSRoute, TCPRoute, UDPRoute and GRPCRoute.

kubectl apply -n fsm-system -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: simple-fsm-gateway
spec:
  gatewayClassName: fsm-gateway-cls
  listeners:
    - protocol: HTTP
      port: 8000
      name: http
      allowedRoutes:
        namespaces:
          from: Same
EOF

Then we can check the resoureces:

kubectl get po,svc -n fsm-system -l app=fsm-gateway
NAME                                          READY   STATUS    RESTARTS   AGE
pod/fsm-gateway-fsm-system-745ddc856b-v64ql   1/1     Running   0          12m

NAME                             TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
service/fsm-gateway-fsm-system   LoadBalancer   10.43.20.139   10.0.2.4      8000:32328/TCP   12m

At this time, you will get result below if trying to access the gateway port:

curl -i 10.0.2.4:8000/
HTTP/1.1 404 Not Found
content-length: 13
connection: keep-alive

Not found

That’s why we have not configure any route. Let’s create a HTTRoute for the Service fsm-controller(The FSM controller has a Pipy repo running).

kubectl apply -n fsm-system -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: repo
spec:
  parentRefs:
  - name: simple-fsm-gateway
    port: 8000
  rules:
  - backendRefs:
    - name: fsm-controller
      port: 6060
EOF

Trigger the request again, it responds 200 this time.

curl -i 10.0.2.4:8000/
HTTP/1.1 200 OK
content-type: text/html
content-length: 0
connection: keep-alive