Warning: Generally, Cloud Providers have their own ingress controller. You can use the Cloud Provider’s ingress controller. For more information, please refer to the kubernetes documentation.
You can execute the following commands to install the Nginx Ingress Controller on your Kubernetes cluster: 
kubectl apply -f ./ingress-nginx-controller-v1.12.1.yaml
Click here to download the ingress-nginx-controller-v1.12.1.yaml file.