Route Traffic to Peered Services

This topic describes how to configure Consul API Gateway to route traffic to services connected to the mesh through a cluster peering connection.

Requirements

1. Consul 1.14 or later
2. Verify that the requirements have been met.
3. Verify that the Consul API Gateway CRDs and controller have been installed and applied. Refer to Installation for details.
4. A peering connection must already be established between Consul clusters. Refer to Cluster Peering on Kubernetes for instructions.
5. The Consul service that you want to route traffic to must be exported to the cluster containing your Gateway. Refer to Cluster Peering on Kubernetes for instructions.
6. A ServiceResolver for the Consul service you want to route traffic to must be created in the cluster that contains your Gateway. Refer to Service Resolver Configuration Entry for instructions.

Configuration

Specify the following fields in your MeshService configuration to use this feature. Refer to the MeshService configuration reference for details about the parameters.

• name
• peer

Example

In the following example, routes that use example-mesh-service as a backend are configured to send requests to the echo service exported by the peered Consul cluster cluster-02.

serviceresolver.yaml

apiVersion: consul.hashicorp.com/v1alpha1
kind: ServiceResolver
metadata:
  name: echo
spec:
  redirect:
    peer: cluster-02
    service: echo

meshservice.yaml

apiVersion: api-gateway.consul.hashicorp.com/v1alpha1
kind: MeshService
metadata:
  name: example-mesh-service
spec:
  name: echo
  peer: cluster-02

After applying the meshservice.yaml configuration, an HTTPRoute may then reference example-mesh-service as its backendRef.

route.yaml

apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: example-route
spec:
  ...
  rules:
    - backendRefs:
        - group: api-gateway.consul.hashicorp.com
          kind: MeshService
          name: example-mesh-service
          port: 3000
      ...