Ingress

• To understand concept of ingress Refer Here
• In k8s we have 3 major objects which will help in ingress (layer 7 loadbalancing)
  • ingress
  • ingressController: This is a third party implementation Refer Here
  • ingressClass
• K8s doesnot have controller for ingress.
• Lets create four simple applicatons Refer Here for changes done
• Create docker image and push them to registry
• For this classroom purpose i will be using nginx-ingress-controller Refer Here
• Our implementation:
  
• lets install nginx-ingress controller using helm

helm repo add nginx-stable https://helm.nginx.com/stable
helm repo update
helm upgrade --install ingress-nginx ingress-nginx \
             --repo https://kubernetes.github.io/ingress-nginx \
             --namespace ingress-nginx --create-namespace

* After last command we see output which better copy to some notepad
* Now execute the following command to watch for external ip to nginx ingress controller kubectl --namespace ingress-nginx get services -o wide -w ingress-nginx-controller

* Get ingress classes and there should be nginx ingress class from helm chart

* lets deploy application and services. Refer Here for the changes


* Refer Here for the manifest file for ingress
* Now create ingress object

* Get external ip of ingress controller using kubectl --namespace ingress-nginx get services -o wide -w ingress-nginx-controller


* Refer Here for official docs of ingress

Node autoscaler

• Refer Here for aks cluster autoscaler
• Refer Here for eks cluster autoscaler