How to expose k8s service to port 80 without a LoadBalancer

Posted September 16, 2020 4.5k views
Load BalancingKubernetes

I have a basic kubernetes cluster with only one node and I want to add a domain to it. But for now I can only use the NodePort to expose the service. Is there a way to expose the service to port 80 without paying for additional LoadBalancer?

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2 answers

You can configure an ingress for the same. However, you will need a domain pointed to your k8s cluster or etchosts entry for cluster ips.

Yes, your option here would be to set you container as privileged and give it access to hostNetwork and use hostPort. I would not recommend this for any production workload as it relies on privileged containers and is advised against in the Kubernetes best practices.

I have provided a working example below:

apiVersion: apps/v1
kind: Deployment
    app: hostport
  name: hostport
  replicas: 1
      app: hostport
        app: hostport
      - image: nginx:latest
        name: nginx
          privileged: true
          - name: http
            containerPort: 80
            hostPort: 80
      hostNetwork: true

You should then be able to access this deployment using:

curl <NODE_IP>:80

Note that because this is using the actual port of the host only the NODE_IP of a node running this pod will respond, unlike a nodeport service where traffic will be forwarded.

Hope this helps!