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How to set up Nginx Ingress for Load Balancers with Proxy Protocol Support

Posted March 19, 2019 19.2k views
Load BalancingKubernetes

Digital Ocean just announced Proxy Protocol support for kubernetes load balancers.

https://blog.digitalocean.com/load-balancers-now-support-proxy-protocol/

How can we modify Nginx Ingress to work with the proxy protocol to get source ip of visitors?

https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nginx-ingress-with-cert-manager-on-digitalocean-kubernetes

Perhaps annotations?

I hope Digital Ocean engineers have tested proxy protocol with Nginx Ingress controllers

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alton
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3 answers
alton March 21, 2019

I got it working!!! The answer is to create a config map with use-proxy-protocol: “true” as follows:

Step 1. Follow instructions from the tutorial

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/cloud-generic.yaml

Step 2. Create the following configmap.yaml that includes use-proxy-protocol:

# configmap.yaml
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
data:
  use-forwarded-headers: "true"
  compute-full-forwarded-for: "true"
  use-proxy-protocol: "true"

Step 3. Apply configmap.yaml

kubectl apply -f configmap.yaml

Step 4. Create your ingress resource:

# ingress.yaml
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: echo-ingress
spec:
  rules:
  - host: echo1.example.com
    http:
      paths:
      - backend:
          serviceName: echo1
          servicePort: 80
  - host: echo2.example.com
    http:
      paths:
      - backend:
          serviceName: echo2
          servicePort: 80

Step 5. Apply your ingress resource:

kubectl apply -f ingress.yaml

Step 6. Wait for the External IP of your load balancer

kubectl get svc -n ingress-nginx

Step 7. Enable Proxy Protocol on your load balancer

Image of load balancer

Step 8. Update your DNS A records with your External IP

Best of luck …

How to Set Up an Nginx Ingress with Cert-Manager on DigitalOcean Kubernetes
by Hanif Jetha
In this tutorial, learn how to set up and secure an Nginx Ingress Controller with Cert-Manager on DigitalOcean Kubernetes.
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  • alton February 10, 2020

    Updates to Step 1 (above) …

    kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.28.0/deploy/static/mandatory.yaml

    create the following file named cloud-generic.yaml

    # cloud-generic.yaml

kind: Service
apiVersion: v1
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
  annotations:
    service.beta.kubernetes.io/do-loadbalancer-enable-proxy-protocol: "true"
spec:
  externalTrafficPolicy: Local
  type: LoadBalancer
  selector:```code```
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
  ports:
    - name: http
      port: 80
      protocol: TCP
      targetPort: http
    - name: https
      port: 443
      protocol: TCP
      targetPort: https

---


    kubectl apply -f cloud-generic.yaml

    Now proxy protocol will be automatically enabled on your load balancer

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  • Codebard May 8, 2020

    Yeah, this extra configmap was necessary to get ip forwarding work for me too.

    Reply Report
  • coddy July 23, 2020

    help me with that pls, I made everything like in your guide, but I have error in nginx logs all time:
    <ip> - - [23/Jul/2020:12:52:20 +0000] “PROXY TCP4 <ip> <ip> 64640 32349” 400 0 “-” “-” “-”.

    Can u pls explain this behaviour? :(

    Reply Report
alton March 26, 2019

BTW … there’s an issue with proxy protocol and the jet stack cert-manager.

See https://github.com/jetstack/cert-manager/issues/466

My only workaround is to temporarily disable proxy protocol on the load balancer (and nginx ingress config map) allowing the certificate to be issued.

kubectl edit configmap -n ingress-nginx nginx-ingress-controller
#  use-proxy-protocol: "true"
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alton March 22, 2019

For anyone using Helm, you can replace steps 1, 2 and 3 (above) with the following …

# nginx-ingress-controller-config.yaml
controller:
  config:
    use-forwarded-headers: "true"
    compute-full-forwarded-for: "true"
    use-proxy-protocol: "true"

helm install --namespace ingress-nginx --name nginx-ingress stable/nginx-ingress -f nginx-ingress-controller-config.yaml
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  • swdee October 31, 2019

    To avoid the manual step of setting the Load balancer into proxy mode via the dashboard, add an annotation to the values file, eg:

    # nginx-ingress-controller-config.yaml
controller:
  config:
    use-forwarded-headers: "true"
    compute-full-forwarded-for: "true"
    use-proxy-protocol: "true"
  service:
    annotations:
      service.beta.kubernetes.io/do-loadbalancer-enable-proxy-protocol: "true"

    Or if you want to just set all of the above options on the CLI using helm

    helm install stable/nginx-ingress --name nginx-ingress --set controller.publishService.enabled=true --set-string controller.config.use-forward-headers=true,controller.config.compute-full-forward-for=true,controller.config.use-proxy-protocol=true  --set controller.service.annotations."service\.beta\.kubernetes\.io/do-loadbalancer-enable-proxy-protocol=true"
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dottodot October 30, 2019
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