I have two-zone, each has to master node. Today I created a simple ingress-nginx controller and successfully pointed a DNS test.example.com to one of the public IP in zone-1.
But now I want to create another nginx-controller in zone-2 and point test.example.com to the public IP address of that zone with cloud DNS.
What approach should I take? Is there any best practice?
Your question is unclear and needs to be improved with any minimal reproducible example. You can find the manual here.
According to your subject, you're using Kubernetes cluster in bare-metal, however you mentioned using cloud DNS. Where did you get cloud DNS?
If you're using pure bare metal, then consider using MetalLB.
MetalLB provides a network load-balancer implementation for Kubernetes clusters that do not run on a supported cloud provider, effectively allowing the usage of LoadBalancer Services within any cluster.
But this approach has a few other limitations one ought to be aware of, one of them is about Ingress status:
$ kubectl get ingress
NAME HOSTS ADDRESS PORTS
test-ingress myapp.example.com 80
Despite the fact there is no load balancer providing a public IP address to the NGINX Ingress controller, it is possible to force the status update of all managed Ingress objects by setting the externalIPs field of the ingress-nginx Service.
Please see the example below:
Given the following 3-node Kubernetes cluster (the external IP is added as an example, in most bare-metal environments this value is <None>)
$ kubectl get node
NAME STATUS ROLES EXTERNAL-IP
host-1 Ready master 203.0.113.1
host-2 Ready node 203.0.113.2
host-3 Ready node 203.0.113.3one could edit the ingress-nginx Service and add the following field to the object spec
spec:
externalIPs:
- 203.0.113.1
- 203.0.113.2
- 203.0.113.3which would in turn be reflected on Ingress objects as follows:
$ kubectl get ingress -o wide
NAME HOSTS ADDRESS PORTS
test-ingress myapp.example.com 203.0.113.1,203.0.113.2,203.0.113.3 80
See more detailed info here