https://sueboy.blogspot.com/2019/01/ingress-nginx-kubernetes-ingress-with.html

Real site is

https://kubernetes.github.io/ingress-nginx/deploy/

  
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml  

Verify installation

https://kubernetes.github.io/ingress-nginx/deploy/#verify-installation

  
kubectl get pods --all-namespaces -l app.kubernetes.io/name=ingress-nginx --watch  

Detect installed version

https://kubernetes.github.io/ingress-nginx/deploy/#detect-installed-version

  
shell script  
  
POD_NAMESPACE=ingress-nginx  
POD_NAME=$(kubectl get pods -n $POD_NAMESPACE -l app.kubernetes.io/name=ingress-nginx -o jsonpath='{.items[0].metadata.name}')  
kubectl exec -it $POD_NAME -n $POD_NAMESPACE -- /nginx-ingress-controller --version  

=========

Other nginx-ingress

https://kubernetes.github.io/ingress-nginx/deploy/#using-helm