If you deploy Contour as a Deployment or Daemonset, you will likely use a
type: LoadBalancer Service to request an external load balancer from your hosting provider.
If you use the Elastic Load Balancer (ELB) service from Amazon's EC2, you need to perform a couple of additional steps to enable the PROXY protocol. Here's why:
External load balancers typically operate in one of two modes: a layer 7 HTTP proxy, or a layer 4 TCP proxy. The former cannot be used to load balance TLS traffic, because your cloud provider attempts HTTP negotiation on port 443. So the latter must be used when Contour handles HTTP and HTTPS traffic.
However this leads to a situation where the remote IP address of the client is reported as the inside address of your cloud provider's load balancer. To rectify the situation, you can add annotations to your service and flags to your Contour Deployment or DaemonSet to enable the PROXY protocol which forwards the original client IP details to Envoy.
In GKE clusters a
type: LoadBalancer Service is provisioned as a Network Load Balancer and will forward traffic to your Envoy instances with their client addresses intact.
Your services should see the addresses in the
X-Envoy-External-Address headers without having to enable a PROXY protocol.
To instruct EC2 to place the ELB into
PROXY mode, add the following annotations to the
apiVersion: v1 kind: Service metadata: annotations: service.beta.kubernetes.io/aws-load-balancer-backend-protocol: tcp service.beta.kubernetes.io/aws-load-balancer-proxy-protocol: '*' name: contour namespace: projectcontour spec: type: LoadBalancer ...
... spec: containers: - image: docker.io/projectcontour/contour:v1.0.0 imagePullPolicy: Always name: contour command: ["contour"] args: ["serve", "--incluster", "--use-proxy-protocol"] ...