How to setup ingress on k8s:

For this I choose minikube and mac for demonstration.

Prerequisites

1. Kubectl
2. Virtual box
3. Pre enabled virtualization

P: POD, N: NODE, S: SERVICES,

Minikube

Minikube is easy to install and gets help you started with Kubernetes. It is easy to install and use.

minikube version

minikube version: v1.2.0

 
minikube start
 
minikube v1.2.0 on darwin (amd64)
💡  Tip: Use 'minikube start -p <name>' to create a new cluster, or 'minikube delete' to delete this one.
🔄  Restarting existing virtualbox VM for "minikube" ...
⌛  Waiting for SSH access ...
🐳  Configuring environment for Kubernetes v1.15.0 on Docker 18.09.6
🔄  Relaunching Kubernetes v1.15.0 using kubeadm ... 
⌛  Verifying: apiserver proxy etcd scheduler controller dns
🏄  Done! kubectl is now configured to use "minikube"

$ minikube status

inikube status

host: Running
kubelet: Running
apiserver: Running
kubectl: Correctly Configured: pointing to minikube-vm at 192.168.99.102

$ minikube addons enable ingress
ingress was successfully enabled

# wait a min for the pod to be up and running
get pods -n kube-system | grep nginx-ingress-controller
nginx-ingress-controller-7b465d9cf8-jxj5s   1/1     Running

Check k8s

kubectl get nodes

NAME       STATUS   ROLES    AGE   VERSION
minikube   Ready    master   66d   v1.15.0

Deploying Application

Since, cluster is running, now lets deploy the objects. Deployment of Pods using deployment file.

kubectl apply -f deployment.yml
deployment.extensions/hello-world created

kubectl get deploy
NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
hello-world           2/2     2            2           111s


kubectl get pods 
NAME                                   READY   STATUS    RESTARTS   AGE
hello-world-7466dfd5d7-nrc7p           1/1     Running   0          3m36s
hello-world-7466dfd5d7-q8lrh           1/1     Running   0          3m36s

Now expose this pod using service.More details here

kubectl apply -f service.yml 
service/hello-world-svc created

$ kubectl get svc
NAME                TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
hello-world-svc     ClusterIP   10.108.198.191   <none>        80/TCP     20s

TargetPort: 8080 is the port we target when we access the service. port: 80 is the port used to access the service.

Now setting up the ingress rule

kubectl apply -f ingress.yml 
ingress.extensions/hello-world-ingress created

$ kubectl get ing
NAME                  HOSTS   ADDRESS     PORTS   AGE
hello-world-ingress   *                   80      22s

This allows us to access the service meow-svc via the /meow path. Since we didn’t specify a host, then we can access it using the clusterIP. Note the nginx.ingress.kubernetes.io/ssl-redirect annotation. It is used since we are not specifying a host. When no host is specified, then the default-server is hit, which is configured with a self-signed certificate, and redirects http to https.

Access the application

$ minikube ip
192.168.99.100
$ curl 192.168.99.100/meow

Troubleshoot

Read here. Read

Reset Everything

minikube stop;
minikube delete;
rm -rf ~/.minikube ~/.kube;
# brew uninstall kubectl;
# brew cask uninstall docker virtualbox minikube;