Use the PROXY protocol

For your information

The PROXY protocol only works correctly with Managed Kubernetes clusters version 1.21.10 or higher. You can upgrade the cluster version.

Download the manifesto ingresscontroller.yaml.

Make changes to the manifest fields that are marked with a tag [EDIT]:

enable the PROXY protocol:

entries:
    proxy-protocol: "true"

create a Service with parameters:

type: LoadBalancer
    externalTrafficPolicy: Cluster
    annotations:
    loadbalancer.openstack.org/proxy-protocol: "true"

Install the Helm package manager.

Optional: add the ingress-nginx repository to Helm and update it:

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update

Create the Ingress Controller using the manifest from step 1:

helm install ingress-nginx/ingress-nginx --values ingresscontroller.yaml --generate-name

Check that the Ingress Controller is installed:

kubectl get svc

The output of the command should contain an external IP address with the suffix nip.io:

NAME                  TYPE         CLUSTER-IP    EXTERNAL-IP          PORT(S)                    AGE
ingress-nginx-ingress LoadBalancer 10.100.100.100 123.123.123.123.nip.io 80:31039/TCP,443:31667/TCP 103s

Create a test Deployment echo server:

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
    name: echoserver
    namespace: default
    labels:
      app: echoserver
spec:
    replicas: 1
    selector:
      matchLabels:
        app: echoserver
    template:
      metadata:
        labels:
          app: echoserver
      spec:
        containers:
        - name: echoserver
          image: gcr.io/google-containers/echoserver:1.10
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8080
EOF

Create a Service for the echo server:

kubectl expose deployment echoserver --type=ClusterIP --target-port=8080

Create an Ingress rule for the Service echo server:

cat <<EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
    name: test-proxy-protocol
    namespace: default
    annotations:
      kubernetes.io/ingress.class: "nginx"
spec:
    rules:
      - host: test.com
        http:
          paths:
          - path: /ping
            pathType: Exact
            backend:
              service:
                name: echoserver
                port:
                  number: 8080
EOF

Check out Ingress:

kubectl get ing

Command output (IP address may appear after a while):

NAME                HOSTS    ADDRESS                PORTS AGE
test-proxy-protocol test.com 123.123.123.123.nip.io 80    2s

Check the connection:

ip=123.123.123.123.nip.io
curl -sH 'Host: test.com' http://$ip/ping | sed '/^\s*$/d'

Command output:

Hostname: echoserver-5c79dc5747-txwnz
Pod Information:
        -no pod information available-
Server values:
        server_version=nginx: 1.13.3 - lua: 10008
Request Information:
        client_address=10.10.10.31
        method=GET
        real path=/ping
        query=
        request_version=1.1
        request_scheme=http
        request_uri=http://test.com:8080/ping
Request Headers:
        accept=*/*
        connection=close
        host=test.com
        user-agent=curl/7.74.0
        x-forwarded-for=<xxx>
        x-forwarded-host=test.com
        x-forwarded-port=80
        x-forwarded-proto=http
        x-real-ip=<xxx>
Request Body:
        -no body in request-