Adding BTP support for TCPRoute #2880
Description
Description:
I'd like to apply a BackendTrafficPolicy to to a TCPRoute. The use case is for load balancing traffic to an MQTT broker (VerneMQ) which is run as a Service in my cluster backed by a StatefulSet with 3 replicas. I'm running a bare metal K8s cluster (microk8s) on Raspberry Pi (arm64) nodes.
From the VerneMQ docs, the recommended approach is to use an ingress controller or external load balancer that can route TCP traffic, load balance based on source ip hashing, and provide TLS termination.
I wanted to try envoy gateway to see if it could fit the bill. But from a Slack convo with @arkodg it seems like BackendTrafficPolicy does not yet apply to TCPRoutes. I tried targeting the policy to the Gateway and then to the TCPRoute but neither seemed to work.
[optional Relevant Links:]
Gateway:
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
name: vernemq-gateway
namespace: vernemq
spec:
gatewayClassName: envoy-gateway
listeners:
- name: vernemq-listener
protocol: TCP
port: 1883
allowedRoutes:
kinds:
- kind: TCPRoute
TCPRoute:
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: TCPRoute
metadata:
name: vernemq-route
namespace: vernemq
spec:
parentRefs:
- name: vernemq-gateway
namespace: vernemq
rules:
- backendRefs:
- group: ""
kind: Service
name: my-vernemq
port: 1883
BackendTrafficPolicy:
apiVersion: gateway.envoyproxy.io/v1alpha1
kind: BackendTrafficPolicy
metadata:
name: vernemq-backend-traffic-policy
namespace: vernemq
spec:
# targetRef:
# group: gateway.networking.k8s.io
# kind: Gateway
# name: vernemq-gateway
# namespace: vernemq
targetRef:
group: gateway.networking.k8s.io
kind: TCPRoute
name: vernemq-route
namespace: vernemq
loadBalancer:
type: ConsistentHash
consistentHash:
type: SourceIP