Question

How to use one loadbalancer for exposing two deployments in two different node pool?

I have two docker images that run on two different node pools. Api runs on say node-pool-a, Api-legacy runs on node-pool-b.

Now I wanted to access both via same loadbalancer using this snippet.

apiVersion: v1
kind: Service
metadata:
  name: api-service
spec:
  selector:
    app: api
  ports:
    - name: api
      port: 8000
      targetPort: 8000
    - name: api-legacy
      port: 1883
      targetPort: 1883
  type: LoadBalancer

But I notice I can use selector for one deployment. Help!


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Bobby Iliev
Site Moderator
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December 15, 2022

Hi there,

Load balancers can listen on multiple ports, but they can only point at one backend service.

You’ll need to put something like ingress-nginx behind the load balancer to route traffic for different domains to different services:

https://marketplace.digitalocean.com/apps/nginx-ingress-controller

There was a similar question asked here:

https://www.digitalocean.com/community/questions/kubernetes-load-balancer-with-multiple-ports

Hope that this helps!

Best,

Bobby