I am implementing an ingress controller with AWS and following this tutorial.

When creating an ingress as shown here, a host name should be given.

spec:
  rules:
  - host: echoserver.example.com #How to let kubernate assign ALB's DNS name and not give our own DNS name.
    http:
      paths:
      - path: /
        backend:
          serviceName: echoserver
          servicePort: 80

But I want to give the ALB's generated DNS name as I don't have my own DNS name. Is there any way to do it ? I tried ommiting the host attribute. But when I describe the ingress as mentioned in my tutorial mentioned above (section 13) running

 kubectl describe ing -n echoserver echoserver  

The value of Address in the response of above command is empty, therefore no way to hit the ingress.

UPDATE:

I created a ALB (through the aws UI, and allowed to forward requests to a target group which is created as default) and set its DNS name to the host name(in simple letters) in ingress yaml file. But I can't see it works. I follow the steps mentioned in above above tutorial.

kubectl logs -n kube-system \ $(kubectl get po -n kube-system | \ egrep -o alb-ingress[a-zA-Z0-9-]+) | \ egrep -o '\[ALB-INGRESS.*

When the above log command executed only the following output returned:

[ALB-INGRESS] [controller] [INFO]: Log level read as "", defaulting to INFO. To change, set LOG_LEVEL environment variable to WARN, ERROR, or DEBUG. [ALB-INGRESS] [controller] [INFO]: Ingress class set to alb [ALB-INGRESS] [controller] [INFO]: albNamePrefix undefined, defaulting to f0591ff6

As per step 12, when the log command executed,

kubectl logs -n kube-system \ $(kubectl get po -n kube-system | \ egrep -o alb-ingress[a-zA-Z0-9-]+) | \ egrep -o '\[ALB-INGRESS.*

there is no any logs.

Also, when following command executed:
kubectl describe ing -n echoserver echoserver
The response is:

Name: echoserver Namespace: echoserver Address: Default backend: default-http-backend:80 (172.17.0.4:8080) Rules: Host Path Backends

ingress-alb-3455057285.us-east-2.elb.amazonaws.com / echoserver:80 () Annotations: Events:

Any idea please where things go wrong ?
I did not set any IAM roles here. If it is required, let me know how should I do it.