How to disable ELB/ALB to allocate fqdn as EXTERNAL-IP(LoadBalancer Ingress) ?

Question

I am trying to create K8 load balancer service for protocol TCP. I am using cilium cni with chaining.

But I do not want ELB to allocate fqdn when I deploy the service. It is possible ?
I want Cilium CNI to do loadbalancing, not the AWS cni !

It is marked below as **LoadBalancer Ingress: **. I do not want it to be allocated

---
apiVersion: v1
kind: Service
metadata:
  name: ubuntu-tcp
  namespace: ubuntu
  labels:
    app: ubuntu
spec:
  type: LoadBalancer
  selector:
    app: ubuntu
  externalIPs:
    - 5.5.5.5
  ports:
    - port: 20000
      name: tcp
      protocol: TCP
      targetPort: 20000

------------------
Name:                     ubuntu-tcp
Namespace:                ubuntu
Labels:                   app=ubuntu
Annotations:              
Selector:                 app=ubuntu
Type:                     LoadBalancer
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.100.10.187
IPs:                      10.100.10.187
External IPs:             5.5.5.5
**LoadBalancer Ingress:     a23c50412db51XXXXXXXXXX-<>.ap-south-1.elb.amazonaws.com**
Port:                     tcp  20000/TCP
TargetPort:               20000/TCP
NodePort:                 tcp  31648/TCP
Endpoints:                192.168.140.33:20000,192.168.164.229:20000
Session Affinity:         None
External Traffic Policy:  Cluster
Events:
  Type    Reason                Age   From                Message
  ----    ------                ----  ----                -------
  Normal  EnsuringLoadBalancer  13s   service-controller  Ensuring load balancer
  Normal  EnsuredLoadBalancer   10s   service-controller  Ensured load balancer

Answer

Hello,

When you create a `LoadBalancer` type service in EKS, the [AWS Load Balancer Controller](https://kubernetes-sigs.github.io/aws-load-balancer-controller) automatically creates an NLB and populates the NLB's DNS Name into the **LoadBalancer Ingress** property by default.

By default, the `loadBalancerClass` property of the Service manifest is set to `service.k8s.aws/nlb`. If you do not desire to use an NLB with your LoadBalancer type service, explicitly set this property value to a different value as shown below.

```
apiVersion: v1
kind: Service
metadata:
    name: ubuntu-tcp
    namespace: ubuntu
    labels:
      app: ubuntu
spec:
  type: LoadBalancer
  selector:
    app: ubuntu
  externalIPs:
  - 5.5.5.5
  loadBalancerClass: 
  ports:
  - port: 20000
    name: tcp
    protocol: TCP
    targetPort: 20000
```
This above manifest will not trigger an NLB creation as the `loadBalancerClass` is not `service.k8s.aws/nlb`.

> **Note:** Cilium CNI might have a specific requirement for the `loadBalancerClass` value. Please go through Cilium documentation to figure out its requirements.

I hope this is helpful to you. Please leave a comment if you have any additional questions and I'll be happy to assist you!

How to disable ELB/ALB to allocate fqdn as EXTERNAL-IP(LoadBalancer Ingress) ?

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