[Install an Nginx Ingress Controller on Kubernetes Cluster using Helm]
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.1.1/deploy/static/provider/do/deploy.yaml

[accessing the application site via CLI]
$ curl echo1.example.com
$ curl echo2.example.com
$ curl https://echo1.example.com
$ curl https://echo2.example.com

[Install an Cert-Manager]
$ kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.7.1/cert-manager.yaml
