PEER-244,245: Add ingress controller and instructions

Signed-off-by: SeeuSim <[email protected]>

Author: SeeuSim

k8s/README.md

@@ -14,13 +14,30 @@
 2. For Minikube:
 
     ```sh
+    # For Horizontal Pod Autoscaling
     minikube addons enable metric-server
+
+    # For Nginx Ingress Controller
+    # Install
+    minikube addons enable ingress
+    # Verify
+    kubectl get pods -n ingress-nginx
     ```
 
 3. For Kubernetes:
 
     ```sh
+    # Metric Server
     kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
+
+    # Ingress Controller
+    # Install
+    kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.44.0/deploy/static/provider/cloud/deploy.yaml
+    # Deploy with load balancer (GKE, AKS, EKS)
+    kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.44.0/deploy/static/provider/cloud/deploy.yaml
+    # Validate
+    kubectl get pods --all-namespaces -l app.kubernetes.io/name=ingress-nginx
+    kubectl get services ingress-nginx-controller --namespace=ingress-nginx
     ```
 
 4. Run the command from the project root:
@@ -29,7 +46,9 @@
     make k8s-up
     ```
 
-5. Run the load test script:
+## Load Testing
+
+1. Run the load test script:
 
     ```sh
     ./scripts/k8s-load-test.sh
@@ -40,7 +59,7 @@
 
     Also, this will ping the service's `/health` endpoint, if configured. Else, it will not work.
 
-6. Run the command:
+2. Run the command:
 
     ```sh
     kubectl -n peerprep get all
@@ -49,5 +68,49 @@
     You should be able to see the Horizontal Pod AutoScaler scaling up the services in respond to 
     resource demand.
 
-7. Run <kbd>Ctrl</kbd>+<kbd>C</kbd> to interrupt and 
+3. Run <kbd>Ctrl</kbd>+<kbd>C</kbd> to interrupt and
     terminate the load tester.
+
+## Exposing the Ingress Controller
+
+1. If you haven't already, run the command from the project root:
+
+    ```sh
+    make k8s-up
+    ```
+
+2. Run the command to set up the ingress controller:
+
+    ```sh
+    kubectl apply -f ./k8s/ingress/06-nginx-ingress.yaml
+    ```
+
+3. Run the command to expose the ingress controller:
+
+    ```sh
+    minikube tunnel
+    ```
+
+4. Edit your `/etc/hosts` file and add the following at the bottom:
+
+    ```txt
+    127.0.0.1 peerprep-g16.net
+    ```
+
+5. Visit `http://peerprep-g16.net` in your browser.
+
+## Running the Minikube Service without Ingress
+
+1. Run the command to set up the cluster:
+
+    ```sh
+    make k8s-up
+    ```
+
+2. Expose the service:
+
+    ```sh
+    minikube -n peerprep service frontend
+    ```
+
+    A browser window should launch, directing you to the application's frontend.